Patent Application
20250039026
Aspects described herein generally relate to techniques for utilizing customized frequency rotation for punctured channels and, in particular, to the selection of frequency rotation per channel configuration as a function of Peak to Average Power Ratio (PAPR).
WiFi protocols utilize configurable channels depending upon current network demands and the particular application. For instance, WiFi 6 (IEEE 802.11ax, finalized on Sep. 1, 2020) may have a channel bandwidth of 20 MHz, 40 MHZ, 80 MHz, or 160 MHz. WiFi 7 (IEEE 802.be, with the initial draft being submitted in March of 2021) may also utilize these channel bandwidths, as well as an increased channel bandwidth of 320 MHz. For both Wi-Fi 6 and WiFi 7, when 80 MHz, 160, MHZ, or 320 MHz channels are used, the wireless channel may comprise a number of sub-channels, which may comprise primary and secondary channels of at least 20 MHz, as well as additional sub-channels that may be split or combined according to detected network needs.
Conventional WiFi protocols require that data transmissions be achieved through the continuous use of the primary and secondary sub-channels. Thus, if interference was present in any portion of the primary or secondary sub-channels, then the entire network would be limited to the use of the primary sub-channel. Thus, preamble puncturing is implemented introduced by WiFi 7 (802.11be) to improve spectral efficiency by allowing a Wi-Fi 7 access point (AP) to transmit a “punctured” (i.e. non-continuous) portion of the spectrum channel if some of the channel is being used by legacy users. Specifically, WiFi 7 allows for 80 MHZ, 160 MHz, or 320 MHz channels to notch a 20 MHz portion of its operating bandwidth when interference is detected (e.g. radar) within that 20 MHz slice of spectrum. WiFi 7 further improves upon this concept with multi-resource unit (RU) puncturing, which enables the use of multiple resource units and puncturing to avoid the congestion caused by interference and to maintain high transmission speeds.
However, although the current WiFi 7 standard allow for channel puncturing, this is realized by using the same frequency rotation values for each channel configuration and bandwidth (e.g. for 80 MHz, 160 MHz, and 320 MHz channels) by simply repeating the 80 MHz frequency rotation values for the remainder of the other 20 MHz sub-channels. As a result, the Peak to Average Power Ratio (PAPR) may increase for some puncturing combinations. Therefore, current WiFi standards are inadequate, and there is a need to improve upon the frequency rotation values that are specified in the standards to improve upon PAPR performance for different channel puncturing combinations.
The accompanying drawings, which are incorporated herein and form a part of the specification, illustrate the aspects of the present disclosure and, together with the description, and further serve to explain the principles of the aspects and to enable a person skilled in the pertinent art to make and use the aspects.
The exemplary aspects of the present disclosure will be described with reference to the accompanying drawings. The drawing in which an element first appears is typically indicated by the leftmost digit(s) in the corresponding reference number.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the aspects of the present disclosure. However, it will be apparent to those skilled in the art that the aspects, including structures, systems, and methods, may be practiced without these specific details. The description and representation herein are the common means used by those experienced or skilled in the art to most effectively convey the substance of their work to others skilled in the art. In other instances, well-known methods, procedures, components, and circuitry have not been described in detail to avoid unnecessarily obscuring aspects of the disclosure.
Again, the current WiFi 7 standard allows for channel puncturing but utilizes the same frequency rotation values regardless of the channel configuration. For example, WiFi 7 includes the ability to use puncturing with a resolution of 20 MHz sub-channels. The puncturing functionality is typically performed to avoid collisions or interference with licensed devices (e.g. radar) that operate on fixed channels. This is a key feature in the WiFi 7 standard, which achieves high spectral efficiency in the Ultra High Band (UHB) channels.
A WiFi 7 device (e.g. an access point (AP)) may transmit 2 types of punctured frames: legacy-DUP and WiFi 7 physical layer protocol data units (PPDUs). The legacy DUP is a duplication of a 20 MHz bandwidth in all the 20 MHz sub-channels of the full channel bandwidth. For instance, a channel with a 320 MHz bandwidth that includes punctured (i.e. unused) 40 MHZ sub-channels is assembled from 14 frequency repetitions of the same 20 MHz channels.
An issue with the use of channel puncturing is that the resulting signal experiences a very high Peak to Average Power Ratio (PAPR). Thus, a frequency rotation value is applied in the frequency domain to each of the 20 MHz sub channels. As an example, the PAPR of an orthogonal frequency-division multiplexing (OFDM) signal without repetition is about 10 dB, whereas the PAPR with frequency repetition without rotation can reach 20 dB. The WiFi 7 standard defines legacy frequency rotation values that reduce the PAPR to ˜ 14 dB. However, the frequency rotation values defined by the Wi-Fi 7 standard are constant for each channel bandwidth and puncturing configuration.
Another issue with puncturing legacy DUP frames is that the selected frequency rotation values do not fit some of the puncturing combinations, and the PAPR increases dramatically. The high variation of PAPR causes an instability of the transmitter's performance and forces the transmitter to take high backoffs and to reduce the transmitted power. These high backoffs in transmission power may also damage the link quality and reduce the link range.
The techniques as further described herein address these issues by providing customized, per channel configuration frequency rotation values. Although the techniques are described throughout this disclosure in the context of the WiFi 7 communication standard, the disclosure is not limited to the use of these specific communication standards and/or frequency bands. The techniques described herein may implement any suitable type of communication standard, protocols, and/or frequency bands to facilitate communications between any suitable type and/or number of devices as further described herein.
The servicing wireless device 102 may form part of the network node 106 or be implemented as a separate component. The servicing wireless device 102 may be implemented as any suitable type of wireless communication device configured to service any suitable number of wireless communication devices 104.1-104.N within a particular coverage zone or range, and may do so by facilitating data communications in accordance with any suitable number and/or type of communication protocols. The servicing wireless device 102 may thus be alternatively implemented (and referred to herein in such instances) as a wireless access point (AP), an eNodeB, a small cell, a femto cell, a pico cell, a micro cell, a road side unit, etc., or any other suitable type of wireless device capable of wireless communications. The servicing wireless device 102 may, when implemented separately from the network node 106, communicate with the network node 106 using the link 130, which may represent one or more wired and/or wireless backhaul communication paths to support the servicing wireless device 102 servicing one or more of the wireless communication devices 104.1-104.N
As part of its servicing operations, the servicing wireless device 102 may perform data transmissions to, and/or receive data transmissions from, any suitable number of wireless communication devices 104.1-104.N. To do so, the servicing wireless device 102 may transmit and/or receive data in accordance with communication protocols that may comply with any suitable communication standards, such as the WiFi 7 standards as discussed herein. These wireless communications may be implemented via the respective links 122.1-122.3 as shown in
Of note, the techniques described herein are not limited to WiFi standards, and may include the use of any suitable type of communication protocol that may utilize punctured channels for wireless data communications. However, it may be particularly useful and convenient to utilize WiFi standards for such communications, which enable and define techniques for implementing punctured channel transmissions. Moreover, the techniques described herein are not limited to a particular region, frequency spectrum, the use of WiFi frequency bands, WiFi channel bandwidths, or the use of 20 MHz sub-channels. Instead, the techniques as described herein may be implemented for any suitable frequency band, channel, and/or sub-channel allocation scheme(s), which may include channels smaller than or larger than Wi-Fi channels and sub-channels as discussed herein, frequency spectrums and/or frequency bands of operation different than WiFi frequency bands, etc. This may additionally or alternatively include communication standards, protocols, and/or frequency bands that are not currently in use at the time of this writing.
Referring now back to
Again, the servicing wireless device 102 may perform wireless communications in accordance with WiFi 7 communication standards, which allow channel puncturing. To further describe this concept, reference is now made to
It is assumed for both scenarios that there is interference and/or another application (e.g. radar) that requires the use of the 20 MHz sub-channel identified with the secondary channel. Thus, the 20 MHz sub-channel identified with the secondary channel cannot be used in this scenario. For the non-puncturing scenario, continuity needs to be preserved for the entire 80 MHZ channel bandwidth, and thus all communications within the network need to revert to the primary channel only. However, when channel puncturing is implemented, the 20 MHz sub-channel identified with the secondary channel may remain unused and “notched out” while the remaining 40 MHz of spectrum may be used to support wireless communications. In other words, channel puncturing refers to puncturing a portion of a channel's bandwidth to enable a non-continuous use of that channel, while the punctured portion of the channel (i.e. the punctured 20 MHz sub-channel as shown in
The servicing wireless device 102 may likewise utilize channel puncturing in accordance with WiFi 7 communication standards. To do so, the servicing wireless device 102 may detect interference and/or collisions with respect to transmissions via one or more sub-channels, and then perform channel puncturing such that one or more of the sub-channels are punctured or unused, as discussed above with respect to
As used herein, the term “channel configuration” may refer to any suitable number and/or type of parameters that are used to define the spectrum and spectral structure of a wireless channel for transmitting and/or receiving data. As a non-limiting and illustrative scenario, the channel configuration may identify the bandwidth of the channel, such as 80 MHZ, 160 MHZ, 320 MHz, etc., as discussed herein and used in accordance with WiFi 7 communication standards. Additionally or alternatively, the channel configuration may identify the number and/or bandwidth of the sub-channels within the wireless channel in accordance with the particular communication protocol. Furthermore, when puncturing is implemented as discussed herein, the channel configuration may identify a spectral location of one or more sub-channels within the channel that is/are punctured.
In other words, a channel configuration may identify a wireless channel bandwidth and a number of sub-channels used within the wireless channel in accordance with a communication protocol (such as WiFi 7), the bandwidth of the primary and secondary channels, the bandwidth of the sub-channels, as well as the spectral location of one or more of the sub-channels within the wireless channel that are punctured. Thus, the servicing wireless device 102 may determine a specific channel configuration based upon network conditions and/or needs, as noted above, which may define the spectral location of punctured sub-channels. The spectral location of the punctured sub-channels (as well as other parameters identified by the channel configuration) may thus change over time, as defined by each of the various channel configurations that may be determined by the servicing wireless device 102. To provide an illustrative and non-limiting scenario, for a 160 MHz wireless channel that comprises eight 20 MHz sub-channels, there may be eight different channel configurations, each corresponding to a different spectral location of the punctured sub-channel within the wireless channel. Of course, additional channel configurations may also exist, which define other parameters of the wireless channel as noted above.
As further discussed herein, the spectral location of each punctured sub-channel may be referred to as an index. For instance, using the scenario for the 160 MHZ channel described above, an index of ‘1’ would refer to a spectral location of a punctured sub-channel at the first 20 MHz sub-channel, index ‘2’ would refer to the spectral location of a punctured sub-channel at the second 20 MHz sub-channel, and so on. Thus, each channel configuration (also referred to herein as a puncturing configuration when channel puncturing is used) identifies the spectral location of the punctured sub-channel with respect to each of the indexes 1-8 in this scenario.
Before providing further detail regarding the use of the frequency rotation values by the servicing wireless device 102, a further discussion regarding frequency rotation values is now warranted. Again, the WiFi 7 standard defines frequency rotation values, which are applied to each of the sub-channels within a wireless channel to reduce constructive interference and, in turn, reduce the resulting PAPR. The application of the frequency rotation values to the sub-channels of the frequency may be performed in the digital domain as a digital signal processing (DSP) multiplicative operation. The term “frequency rotation” as used herein refers to the gamma rotation that is used in accordance with the various IEEE 802.11xx standards, i.e. any of the WiFi-related standards, including the WiFi 7 communication standard as discussed herein. The frequency rotation value is thus a phase value that is constant for each 20 MHZ sub-channel, and represents an exponent ejϕ with a magnitude ‘1,’ where ϕ represents the frequency rotation that is based upon the sub-channel bandwidth. Thus, when a DSP operation is performed by multiplying a set of frequency rotation values in the frequency domain with each one of the respective sub-channels for a particular wireless channel configuration, the gain is unaffected and only the phase is changed. In other words, the frequency rotation values, when multiplied by each of the sub-carrier signals in the frequency domain, result in a phase rotation of each of the 20 MHz sub-channels out of the full transmitted channel bandwidth. To simplify the DSP operations, the frequency rotation values may be quantized into values such as +90 degrees (ejϕ) and −90 degrees (e−jϕ) values, as well as 0 degrees and 180 degrees, etc.
However, and as noted above, the transmission of punctured channels may increase the PAPR, which is a result of the spectral proximity of the 20 MHz sub-channels resulting in constructive interference during transmission. Moreover, the WiFi 7 standard simply repeats the frequency rotation values for each set of four 20 MHz sub-carriers within a channel, and are not adjusted among the different channel configurations to consider the presence and/or spectral location of punctured channels. For instance, the WiFi 7 standard defines the frequency rotation values for the 20 MHz sub-channels of a 320 MHz channel using the aforementioned indexing notation described above, which provides frequency rotation values for indexes 1 to 16 as follows:
[1-1-1-1 1-1-1-1 1-1-1-1 1-1-1-1]
As another example, the WiFi 7 standard defines the frequency rotation values for the 20 MHZ sub-channels of a 160 MHz channel using the aforementioned indexing notation described above, which provides frequency rotation values for indexes 1 to 8 as follows:
[1-1-1-1 1-1-1-1].
In other words, and referencing the 160 MHz channel, the multiplication of each frequency rotation value in the frequency domain via a DSP operation results in a phase shift of +90 degrees, −90 degrees, −90 degrees, −90 degrees, +90 degrees, −90 degrees, −90 degrees, and −90 degrees, respectively, for the eight 20 MHZ sub-channels. This frequency rotation operation is thus performed via DSP for each 20 MHz sub-channel prior to transmitting the signal over the wireless channel. As a result, the WiFi 7 standard achieves reduced PAPR values by reducing the constructive interference among the different sub-channels.
However, the PAPR values may change significantly between the different puncturing configurations, and thus the application of the same frequency rotation values for different puncturing configurations may likewise result in variations in the PAPR per configuration.
Thus, the WiFi 7 standard utilizes “standardized” frequency rotation values regardless of the particular puncturing configuration, acknowledging a tradeoff between the different PAPR variations among the different channel configurations. However, the techniques described herein acknowledge that the PAPR may be further improved by providing customized frequency rotation values per channel configuration. To provide an illustrative and non-limiting scenario, this may include utilizing different frequency rotation values for each of the puncturing configurations as shown in
Therefore, and as noted above, the servicing wireless device 102 may determine a channel configuration of a wireless channel from among a number of possible channel configurations, which may be in response to the presence of interference, current network conditions or demands, etc. Once determined, the servicing wireless device 102 may then select corresponding frequency values for that particular wireless channel configuration, which are then applied to the sub-channels within the wireless channel (such as via DSP multiplication with the different 20 MHz sub-carriers as noted above). Thus, the frequency rotation values may be selected from among a set of frequency rotation values, with each of the frequency rotation values from among the set being different from one another and corresponding to each one of the channel configurations.
Turning back now to
Thus, a set of frequency rotation values may be generated and stored for each puncturing configuration prior to the operation of the servicing wireless device 102. This set of frequency rotation values may be based upon a selection, for each one of a number of channel configurations (such as for all possible channel configurations) of frequency rotation values that result in a corresponding PAPR value. The corresponding PAPR value may be a maximum PAPR value across all sub-channels for that set of frequency rotation values, as further noted herein, which is less than or equal to a predetermined threshold PAPR value. The predetermined threshold PAPR value may be any suitable predetermined PAPR value, the details of which are further discussed below.
To determine the frequency rotation values on a per channel configuration basis, any suitable number and/or type of techniques may be implemented. This may include the use of offline techniques that identify the frequency rotation values for different channel configurations, which are then stored in a memory or other suitable location that is accessed by the servicing wireless device 102 once a channel configuration is determined. As a non-limiting and illustrative scenario, a simulation may be performed offline to determine the frequency rotation values per channel configuration as a function of any suitable number and/or type of parameters. This may include the use of any suitable type of simulation that computes, for each one of a number of channel configurations (such as all possible channel configurations), resulting (i.e. simulated or computed) PAPR values for a transmitted signal upon applying each one of a number of frequency rotation values, which may comprise the maximum PAPR value (such as the worst case PAPR across all sub-channels) obtained by applying, for each puncturing configuration, different sets of frequency rotation values. That is, the frequency rotation values may be determined by selecting, for each channel configuration, the frequency rotation values that result in a corresponding PAPR value that is the lowest maximum PAPR among the computed maximum PAPR values for each channel configuration. In other words, the minimum or lowest PAPR value may correspond to, for each puncturing configuration that is simulated, the lowest of all maximum PAPR values resulting from the application of different sets of frequency rotation values. Alternatively, the frequency rotation values may be determined by selecting, for each channel configuration, any one of several frequency rotation values that result in a corresponding PAPR value that meets (i.e. is at least equal to but may be smaller) than a predetermined threshold PAPR value. Thus, the predetermined threshold PAPR value may comprise the lowest computed PAPR value (such as from among the set of corresponding maximum PAPR values) per channel configuration, or alternatively may comprise a PAPR value that is greater than the lowest maximum PAPR value based upon the needs of a particular application.
In other words, the set of frequency rotation values are determined based upon a computation, for each one of the channel configurations, of a respective set of PAPR values. Each one of the set of PAPR values corresponds to the application of different frequency rotation values to the sub-channels for that channel configuration. The maximum of the PAPR values may then be used such that the frequency rotation values are then selected for each channel configuration based upon which frequency rotation values yield the lowest maximum PAPR value (or meets another suitable predetermined PAPR threshold value) from among the computed maximum PAPR values.
Because an infinite number of frequency rotation values may exist for each channel configuration, the techniques described herein may advantageously implement a phase quantization process that reduces the number of combinations of frequency rotation values that may be computed per channel configuration to a predetermined number of combinations. In a non-limiting and illustrative scenario, the frequency rotation values may be determined for each one of the channel configurations by quantizing the different frequency rotation values to 0 degrees, +90 degrees, −90 degrees, and 180 degrees, which matches that used by the WiFi 7 standard as noted herein, or any subset thereof, such as 0 degrees and 180 degrees as further discussed herein. In doing so, a finite and predetermined number of combinations of frequency rotation values may be obtained for each one of the channel configurations. It is noted that the quantization of the phase values to two values, as well as the specific use of +90 degrees, 0 degrees, 180 degrees, etc., is provided for case of explanation and not limitation. The techniques described herein may compute frequency rotation values using any suitable number of phase quantizations and/or quantization values that may differ from these quantized phase values.
A demonstration of the computation of frequency rotation values is shown with respect to
Therefore, for this particular channel configuration in which the first 20 MHZ sub-channel is punctured, the corresponding “best” frequency rotation values as shown in
Another illustrative and non-limiting scenario is described with reference to
As was the case for
The processing circuitry 502 may be configured as any suitable number and/or type of computer processors, which may function to control the device 500 and/or other components of the device 500. The processing circuitry 502 may be identified with one or more processors (or suitable portions thereof) implemented by the device 500. The processing circuitry 502 may be identified with one or more processors such as a host processor, a digital signal processor, one or more microprocessors, graphics processors, baseband processors, microcontrollers, an application-specific integrated circuit (ASIC), part (or the entirety of) a field-programmable gate array (FPGA), etc. Although referred to as processing circuitry herein, it is understood that the processing circuitry 502 may work in conjunction with software components to execute machine readable-instructions stored in the memory 506, to execute sets of instructions or code, etc. to realize the various techniques as described herein.
In any event, the processing circuitry 502 is configured to carry out instructions to perform arithmetical, logical, and/or input/output (I/O) operations, and/or to control the operation of one or more components of device 500 to perform various functions associated with the techniques as described herein. The processing circuitry 502 may include one or more microprocessor cores, memory registers, buffers, clocks, etc., and may generate electronic control signals associated with the components of the device 500 to control and/or modify the operation of these components. The processing circuitry 502 may communicate with and/or control functions associated with the transceiver 504 and/or the memory 506.
The transceiver 504 may be implemented as any suitable number and/or type of components configured to transmit and/or receive wireless signals in accordance with any suitable number and/or type of communication protocols, as discussed herein. These may include, in some non-limiting and illustrative scenarios, WiFi protocols, such as WiFi 6 (IEEE 802.11ax), Wi-Fi 7 (IEEE 802.be), etc. The transceiver 504 may include any suitable type of components to facilitate this functionality, including components associated with known transceiver, transmitter, and/or receiver operation, configurations, and implementations. Although depicted in
Regardless of the particular implementation, the transceiver 504 may include one or more components configured to transmit and/or receive data using any suitable number frequency bands in accordance with any suitable number of communication standards and protocols. The transceiver 504 may be configured to receive data and/or listen on certain frequency bands as discussed herein to perform channel observations. Additionally, the transceiver 504 may include one or more components configured to transmit data signals in accordance with a determined channel configuration, which may include transmitting data signals after the application of respective frequency rotation values to the sub-carriers. The transceiver 504 may be controlled by the processing circuitry 502 to transmit data signals using the sub-channels, channel bandwidth, etc., identified via the currently-selected channel configuration, as discussed herein
The memory 506 is configured to store data and/or instructions such that, when the instructions are executed by the processing circuitry 502, cause the device 500 to perform any of the various functions as described herein. The memory 506 may be implemented as any suitable volatile and/or non-volatile memory, including, in some illustrative and non-limiting scenarios, read-only memory (ROM), random access memory (RAM), flash memory, a magnetic storage media, an optical disc, erasable programmable read only memory (EPROM), programmable read only memory (PROM), etc. The memory 506 may be non-removable, removable, or a combination of both. The memory 506 may be implemented as a non-transitory computer readable medium storing one or more executable instructions such as logic, algorithms, code, etc.
As further discussed below, the instructions, logic, code, etc., stored in the memory 506 are represented by the various modules as shown in
As shown in
The executable instructions stored in the channel configuration determination module 507 may facilitate, in conjunction with execution via the processing circuitry 502, the device 500 determining a current channel configuration for data transmissions. The selection of a channel configuration may be made in any suitable manner, including the use of known techniques. In various illustrative and non-limiting scenarios, the channel configuration may be determined using any suitable parameters that are derived from a channel observation by the device 500, receiving and decoding information from the network, receiving an indication from another device regarding current interference and/or the use of certain sub-channels, etc.
The executable instructions stored in the frequency rotation values selection/application module 509 may facilitate, in conjunction with execution via the processing circuitry 502, the selection and application of one of the frequency rotation values from among the frequency rotation value sets 511. This may include the device 500 identifying the current channel configuration, and then selecting the corresponding frequency rotation values from the memory 506 that are mapped to that specific channel configuration. This may further comprise the device 500 applying the selected frequency rotation values to the sub-channels of the channel as identified by the channel configuration. Again, the application of the frequency rotation values may comprise a multiplication operation that is performed in the digital signal domain as part of one or more DSP operations, which results in a multiplication of each respective frequency rotation value by each of the sub-channels within the channel.
The process flow 600 may be performed via any suitable type of wireless communication device, such as one or more devices operating within a wireless network, in accordance with any suitable number and/or type of communication protocols. The process flow 600 may be performed, in various illustrative and non-limiting scenarios, via the servicing wireless device 102 as shown and discussed herein with respect to
The process flow 600 begins with a determination (block 602) of whether a change to the current channel configuration is needed. Thus, the first step in the process flow 600 assumes that a previous determination has already been made with respect to the use of a particular channel configuration, which may comprise any of the techniques to do so as discussed herein, including known techniques. Thus, the determination (block 602) is with respect to whether a previously-determined channel configuration may continue to be used or needs to be updated. If the current channel configuration needs to be updated, then the process flow 600 may continue to block 606. However, if the channel configuration is to remain unchanged, then the process flow 600 continues to block 604.
In either case, the process flow 600 comprises the selection (block 608) of frequency rotation values for the currently-selected channel configuration. This may include the selection of frequency rotation values from a frequency rotation value set stored in a memory, as discussed above with respect to
Once the frequency rotation values are selected based upon the currently-used channel configuration, then the process flow 600 may comprise applying (block 610) the frequency rotation values to the sub-channels of the channel identified by the channel configuration. This may include a multiplication operation in the digital domain via one or more DSP operations, as noted herein.
Upon applying (block 610) frequency rotation values to the sub-channels of the channel, the process flow 600 may comprise transmitting data signals in accordance with the applied frequency rotation values. In other words, the application of the frequency rotation values in the digital domain may result in an updated set of digital data, which is then transmitted in accordance with the current channel configuration. Again, such a data transmission may be performed in accordance with any suitable communication protocol and/or standard, such as the WiFi 7 standards as discussed herein.
The process flow 600 may operate dynamically in response to changing channel and/or network conditions. Thus, the process flow 600 may comprise monitoring the various channel parameters, conditions, messages, etc. as noted above to periodically or continuously determine (block 602) whether the channel configuration should be updated. Based upon this determination, the same frequency rotation values or new, updated frequency rotation values may then be applied to the sub-channels for subsequent data transmissions.
An access point (AP) is provided. The AP comprises processing circuitry configured to: determine, from among a plurality of channel configurations, a channel configuration of a wireless channel, with each one of the plurality of channel configurations identifying a plurality of sub-channels within the wireless channel in accordance with a communication protocol, with one of the plurality of sub-channels being punctured at a spectral location within the wireless channel; apply, for the determined channel configuration, frequency rotation values to the plurality of sub-channels within the wireless channel, with the frequency rotation values being selected from among a set of frequency rotation values, and each of the frequency rotation values from among the set of frequency rotation values being different from one another and corresponding to each respective one of the plurality of channel configurations; and a transmitter configured to transmit data via the wireless channel using the determined channel configuration in accordance with the application of the selected frequency rotation values to the respective sub-channels within the wireless channel. In addition or in alternative to and in any combination with the optional features previously explained in this paragraph, the set of frequency rotation values are based upon a selection, for each one of the plurality of channel configurations, of frequency rotation values that result in a corresponding Peak to Average Power Ratio (PAPR) value being less than or equal to a predetermined threshold PAPR value. In addition or in alternative to and in any combination with the optional features previously explained in this paragraph, for a channel configuration from among the plurality of channel configurations, the predetermined PAPR threshold is less than a PAPR value resulting from a transmission of a signal using the channel configuration without a punctured sub-channel. In addition or in alternative to and in any combination with the optional features previously explained in this paragraph, the set of frequency rotation values are determined based upon (i) a computation, for each one of the plurality of channel configurations, of a respective plurality of maximum Peak to Average Power Ratio (PAPR) values, each one of the plurality of maximum PAPR values corresponding to an application of different frequency rotation values, and (ii) a selection of frequency rotation values for each one of the plurality of channel configurations that results in a lowest maximum PAPR value from among the respective maximum plurality of PAPR values. In addition or in alternative to and in any combination with the optional features previously explained in this paragraph, the frequency rotation values are determined for each one of the plurality of channel configurations by quantizing the different frequency rotation values to 0 degrees, +90 degrees, −90 degrees, or 180 degrees to obtain a predetermined number of combinations of frequency rotation values for each one of the plurality of channel configurations. In addition or in alternative to and in any combination with the optional features previously explained in this paragraph, the set of frequency rotation values are determined, for each one of the plurality of channel configurations, based upon a selection of frequency rotation values that results in a lowest maximum PAPR value from among the predetermined number of combinations of frequency rotation values. In addition or in alternative to and in any combination with the optional features previously explained in this paragraph, the communication protocol comprises an Institute of Electrical and Electronics Engineers (IEEE) IEEE 802.be communication standard. In addition or in alternative to and in any combination with the optional features previously explained in this paragraph, the plurality of sub-channels have a bandwidth of 20 MHZ. In addition or in alternative to and in any combination with the optional features previously explained in this paragraph, the wireless channel has a bandwidth of 160 MHz or 320 MHZ. In addition or in alternative to and in any combination with the optional features previously explained in this paragraph, the plurality of channel configurations comprise a channel configuration that identifies a plurality of sub-channels within the wireless channel in accordance with the communication protocol, with two or more of the plurality of sub-channels being punctured at a respective spectral location within the wireless channel.
A non-transitory computer readable medium is provided. The non-transitory computer-readable medium has instructions stored thereon that, when executed by one or more processors of a wireless communication device, cause the wireless communication device to: determine, from among a plurality of channel configurations, a channel configuration of a wireless channel, with each one of the plurality of channel configurations identifying a plurality of sub-channels within the wireless channel in accordance with a communication protocol, and each of the frequency rotation values from among the set of frequency rotation values being different from one another and corresponding to each respective one of the plurality of channel configurations; apply, for the selected channel configuration, frequency rotation values to the plurality of sub-channels within the wireless channel, with the frequency rotation values being selected from among a set of frequency rotation values, with each one of the set of frequency rotation values being different from one another and corresponding to each respective one of the plurality of channel configurations; and cause data to be transmitted via the wireless channel using the determined channel configuration in accordance with the application of the selected frequency rotation values to the respective sub-channels within the wireless channel. In addition or in alternative to and in any combination with the optional features previously explained in this paragraph, the set of frequency rotation values are based upon a selection, for each one of the plurality of channel configurations, of frequency rotation values that result in a corresponding Peak to Average Power Ratio (PAPR) value being less than or equal to a predetermined threshold PAPR value. In addition or in alternative to and in any combination with the optional features previously explained in this paragraph, for a channel configuration from among the plurality of channel configurations, the predetermined PAPR threshold is less than a PAPR value resulting from a transmission of a signal using the channel configuration without a punctured sub-channel. In addition or in alternative to and in any combination with the optional features previously explained in this paragraph, the set of frequency rotation values are determined based upon (i) a computation, for each one of the plurality of channel configurations, of a respective plurality of maximum Peak to Average Power Ratio (PAPR) values, each one of the plurality of maximum PAPR values corresponding to an application of different frequency rotation values, and (ii) a selection of frequency rotation values for each one of the plurality of channel configurations that results in a lowest maximum PAPR value from among the respective plurality of maximum PAPR values. In addition or in alternative to and in any combination with the optional features previously explained in this paragraph, the frequency rotation values are determined for each one of the plurality of channel configurations by quantizing the different frequency rotation values to 0 degrees, +90 degrees, −90 degrees, or 180 degrees to obtain a predetermined number of combinations of frequency rotation values for each one of the plurality of channel configurations. In addition or in alternative to and in any combination with the optional features previously explained in this paragraph, the set of frequency rotation values are determined, for each one of the plurality of channel configurations, based upon a selection of frequency rotation values that results in a lowest maximum PAPR value from among the predetermined number of combinations of frequency rotation values. In addition or in alternative to and in any combination with the optional features previously explained in this paragraph, the communication protocol comprises an Institute of Electrical and Electronics Engineers (IEEE) 802.be communication standard. In addition or in alternative to and in any combination with the optional features previously explained in this paragraph, the plurality of sub-channels have a bandwidth of 20 MHz. In addition or in alternative to and in any combination with the optional features previously explained in this paragraph, the wireless channel has a bandwidth of 160 MHz or 320 MHz. In addition or in alternative to and in any combination with the optional features previously explained in this paragraph, the plurality of channel configurations comprise a channel configuration that identifies a plurality of sub-channels within the wireless channel in accordance with the communication protocol, with two or more of the plurality of sub-channels being punctured at a respective spectral location within the wireless channel.
The following examples pertain to various techniques of the present disclosure.
An example (e.g. example 1) is directed to an access point (AP), comprising: processing circuitry configured to: determine, from among a plurality of channel configurations, a channel configuration of a wireless channel, wherein each one of the plurality of channel configurations identifies a plurality of sub-channels within the wireless channel in accordance with a communication protocol, with one of the plurality of sub-channels being punctured at a spectral location within the wireless channel; apply, for the determined channel configuration, frequency rotation values to the plurality of sub-channels within the wireless channel, wherein the frequency rotation values are selected from among a set of frequency rotation values, with each of the frequency rotation values from among the set of frequency rotation values being different from one another and corresponding to each respective one of the plurality of channel configurations; and a transmitter configured to transmit data via the wireless channel using the determined channel configuration in accordance with the application of the selected frequency rotation values to the respective sub-channels within the wireless channel.
Another example (e.g. example 2) relates to a previously-described example (e.g. example 1), wherein the set of frequency rotation values are based upon a selection, for each one of the plurality of channel configurations, of frequency rotation values that result in a corresponding Peak to Average Power Ratio (PAPR) value being less than a predetermined threshold PAPR value.
Another example (e.g. example 3) relates to a previously-described example (e.g. one or more of examples 1-2), wherein, for a channel configuration from among the plurality of channel configurations, the predetermined PAPR threshold is less than a PAPR value resulting from a transmission of a signal using the channel configuration without a punctured sub-channel.
Another example (e.g. example 4) relates to a previously-described example (e.g. one or more of examples 1-3), wherein the set of frequency rotation values are determined based upon (i) a computation, for each one of the plurality of channel configurations, of a respective plurality of maximum Peak to Average Power Ratio (PAPR) values, each one of the plurality of maximum PAPR values corresponding to an application of different frequency rotation values, and (ii) a selection of frequency rotation values for each one of the plurality of channel configurations that results in a lowest maximum PAPR value from among the respective maximum plurality of PAPR values.
Another example (e.g. example 5) relates to a previously-described example (e.g. one or more of examples 1-4), wherein the frequency rotation values are determined for each one of the plurality of channel configurations by quantizing the different frequency rotation values to 0 degrees, +90 degrees, −90 degrees, or 180 degrees to obtain a predetermined number of combinations of frequency rotation values for each one of the plurality of channel configurations.
Another example (e.g. example 6) relates to a previously-described example (e.g. one or more of examples 1-5), wherein the set of frequency rotation values are determined, for each one of the plurality of channel configurations, based upon a selection of frequency rotation values that results in a lowest maximum PAPR value from among the predetermined number of combinations of frequency rotation values.
Another example (e.g. example 7) relates to a previously-described example (e.g. one or more of examples 1-6), wherein the communication protocol comprises an Institute of Electrical and Electronics Engineers (IEEE) IEEE 802.be communication standard.
Another example (e.g. example 8) relates to a previously-described example (e.g. one or more of examples 1-7), wherein the plurality of sub-channels have a bandwidth of 20 MHZ.
Another example (e.g. example 9) relates to a previously-described example (e.g. one or more of examples 1-8), wherein the wireless channel has a bandwidth of 160 MHz or 320 MHZ.
Another example (e.g. example 10) relates to a previously-described example (e.g. one or more of examples 1-9), wherein the plurality of channel configurations comprise a channel configuration that identifies a plurality of sub-channels within the wireless channel in accordance with the communication protocol, with two or more of the plurality of sub-channels being punctured at a respective spectral location within the wireless channel.
An example (e.g. example 11) is directed to a non-transitory computer readable medium having instructions stored thereon that, when executed by one or more processors of a wireless communication device, cause the wireless communication device to: determine, from among a plurality of channel configurations, a channel configuration of a wireless channel, wherein each one of the plurality of channel configurations identifies a plurality of sub-channels within the wireless channel in accordance with a communication protocol, with each of the frequency rotation values from among the set of frequency rotation values being different from one another and corresponding to each respective one of the plurality of channel configurations; apply, for the selected channel configuration, frequency rotation values to the plurality of sub-channels within the wireless channel, wherein the frequency rotation values are selected from among a set of frequency rotation values, with each one of the set of frequency rotation values being different from one another and corresponding to each respective one of the plurality of channel configurations; and cause data to be transmitted via the wireless channel using the determined channel configuration in accordance with the application of the selected frequency rotation values to the respective sub-channels within the wireless channel.
Another example (e.g. example 12) relates to a previously-described example (e.g. example 11), wherein the set of frequency rotation values are based upon a selection, for each one of the plurality of channel configurations, of frequency rotation values that result in a corresponding Peak to Average Power Ratio (PAPR) value being less than or equal to a predetermined threshold PAPR value.
Another example (e.g. example 13) relates to a previously-described example (e.g. one or more of examples 11-12), wherein, for a channel configuration from among the plurality of channel configurations, the predetermined PAPR threshold is less than a PAPR value resulting from a transmission of a signal using the channel configuration without a punctured sub-channel.
Another example (e.g. example 14) relates to a previously-described example (e.g. one or more of examples 11-13), wherein the set of frequency rotation values are determined based upon (i) a computation, for each one of the plurality of channel configurations, of a respective plurality of maximum Peak to Average Power Ratio (PAPR) values, each one of the plurality of maximum PAPR values corresponding to an application of different frequency rotation values, and (ii) a selection of frequency rotation values for each one of the plurality of channel configurations that results in a lowest maximum PAPR value from among the respective plurality of maximum PAPR values.
Another example (e.g. example 15) relates to a previously-described example (e.g. one or more of examples 11-14), wherein the frequency rotation values are determined for each one of the plurality of channel configurations by quantizing the different frequency rotation values to 0 degrees, +90 degrees, −90 degrees, or 180 degrees to obtain a predetermined number of combinations of frequency rotation values for each one of the plurality of channel configurations.
Another example (e.g. example 16) relates to a previously-described example (e.g. one or more of examples 11-15), wherein the set of frequency rotation values are determined, for each one of the plurality of channel configurations, based upon a selection of frequency rotation values that results in a lowest maximum PAPR value from among the predetermined number of combinations of frequency rotation values.
Another example (e.g. example 17) relates to a previously-described example (e.g. one or more of examples 11-16), wherein the communication protocol comprises an Institute of Electrical and Electronics Engineers (IEEE) 802.be communication standard.
Another example (e.g. example 18) relates to a previously-described example (e.g. one or more of examples 11-17), wherein the plurality of sub-channels have a bandwidth of 20 MHZ.
Another example (e.g. example 19) relates to a previously-described example (e.g. one or more of examples 11-18), wherein the wireless channel has a bandwidth of 160 MHz or 320 MHZ.
Another example (e.g. example 20) relates to a previously-described example (e.g. one or more of examples 11-19), wherein the plurality of channel configurations comprise a channel configuration that identifies a plurality of sub-channels within the wireless channel in accordance with the communication protocol, with two or more of the plurality of sub-channels being punctured at a respective spectral location within the wireless channel.
An example (e.g. example 21) is directed to an access point (AP), comprising: a processing means for: determining, from among a plurality of channel configurations, a channel configuration of a wireless channel, wherein each one of the plurality of channel configurations identifies a plurality of sub-channels within the wireless channel in accordance with a communication protocol, with one of the plurality of sub-channels being punctured at a spectral location within the wireless channel; applying, for the determined channel configuration, frequency rotation values to the plurality of sub-channels within the wireless channel, wherein the frequency rotation values are selected from among a set of frequency rotation values, with each of the frequency rotation values from among the set of frequency rotation values being different from one another and corresponding to each respective one of the plurality of channel configurations; and a transmission means for transmitting data via the wireless channel using the determined channel configuration in accordance with the application of the selected frequency rotation values to the respective sub-channels within the wireless channel.
Another example (e.g. example 22) relates to a previously-described example (e.g. example 21), wherein the set of frequency rotation values are based upon a selection, for each one of the plurality of channel configurations, of frequency rotation values that result in a corresponding Peak to Average Power Ratio (PAPR) value being less than or equal to a predetermined threshold PAPR value.
Another example (e.g. example 23) relates to a previously-described example (e.g. one or more of examples 21-22), wherein, for a channel configuration from among the plurality of channel configurations, the predetermined PAPR threshold is less than a PAPR value resulting from a transmission of a signal using the channel configuration without a punctured sub-channel.
Another example (e.g. example 24) relates to a previously-described example (e.g. one or more of examples 21-23), wherein the set of frequency rotation values are determined based upon (i) a computation, for each one of the plurality of channel configurations, of a respective plurality of maximum Peak to Average Power Ratio (PAPR) values, each one of the plurality of maximum PAPR values corresponding to an application of different frequency rotation values, and (ii) a selection of frequency rotation values for each one of the plurality of channel configurations that results in a lowest maximum PAPR value from among the respective maximum plurality of PAPR values.
Another example (e.g. example 25) relates to a previously-described example (e.g. one or more of examples 21-24), wherein the frequency rotation values are determined for each one of the plurality of channel configurations by quantizing the different frequency rotation values to 0 degrees, +90 degrees, −90 degrees, or 180 degrees to obtain a predetermined number of combinations of frequency rotation values for each one of the plurality of channel configurations.
Another example (e.g. example 26) relates to a previously-described example (e.g. one or more of examples 21-25), wherein the set of frequency rotation values are determined, for each one of the plurality of channel configurations, based upon a selection of frequency rotation values that results in a lowest maximum PAPR value from among the predetermined number of combinations of frequency rotation values.
Another example (e.g. example 27) relates to a previously-described example (e.g. one or more of examples 21-26), wherein the communication protocol comprises an Institute of Electrical and Electronics Engineers (IEEE) IEEE 802.be communication standard.
Another example (e.g. example 28) relates to a previously-described example (e.g. one or more of examples 21-27), wherein the plurality of sub-channels have a bandwidth of 20 MHZ.
Another example (e.g. example 29) relates to a previously-described example (e.g. one or more of examples 21-28), wherein the wireless channel has a bandwidth of 160 MHz or 320 MHZ.
Another example (e.g. example 30) relates to a previously-described example (e.g. one or more of examples 21-29), wherein the plurality of channel configurations comprise a channel configuration that identifies a plurality of sub-channels within the wireless channel in accordance with the communication protocol, with two or more of the plurality of sub-channels being punctured at a respective spectral location within the wireless channel.
An example (e.g. example 31) is directed to a non-transitory computer readable medium having instructions stored thereon that, when executed by a processing means of a wireless communication device, cause the wireless communication device to: determine, from among a plurality of channel configurations, a channel configuration of a wireless channel, wherein each one of the plurality of channel configurations identifies a plurality of sub-channels within the wireless channel in accordance with a communication protocol, with each of the frequency rotation values from among the set of frequency rotation values being different from one another and corresponding to each respective one of the plurality of channel configurations; apply, for the selected channel configuration, frequency rotation values to the plurality of sub-channels within the wireless channel, wherein the frequency rotation values are selected from among a set of frequency rotation values, with each one of the set of frequency rotation values being different from one another and corresponding to each respective one of the plurality of channel configurations; and cause data to be transmitted via the wireless channel using the determined channel configuration in accordance with the application of the selected frequency rotation values to the respective sub-channels within the wireless channel.
Another example (e.g. example 32) relates to a previously-described example (e.g. example 31), wherein the set of frequency rotation values are based upon a selection, for each one of the plurality of channel configurations, of frequency rotation values that result in a corresponding Peak to Average Power Ratio (PAPR) value being less than a predetermined threshold PAPR value.
Another example (e.g. example 33) relates to a previously-described example (e.g. one or more of examples 31-32), wherein, for a channel configuration from among the plurality of channel configurations, the predetermined PAPR threshold is less than a PAPR value resulting from a transmission of a signal using the channel configuration without a punctured sub-channel.
Another example (e.g. example 34) relates to a previously-described example (e.g. one or more of examples 31-33), wherein the set of frequency rotation values are determined based upon (i) a computation, for each one of the plurality of channel configurations, of a respective plurality of maximum Peak to Average Power Ratio (PAPR) values, each one of the plurality of maximum PAPR values corresponding to an application of different frequency rotation values, and (ii) a selection of frequency rotation values for each one of the plurality of channel configurations that results in a lowest maximum PAPR value from among the respective plurality of maximum PAPR values.
Another example (e.g. example 35) relates to a previously-described example (e.g. one or more of examples 31-34), wherein the frequency rotation values are determined for each one of the plurality of channel configurations by quantizing the different frequency rotation values to 0 degrees, +90 degrees, −90 degrees, or 180 degrees to obtain a predetermined number of combinations of frequency rotation values for each one of the plurality of channel configurations.
Another example (e.g. example 36) relates to a previously-described example (e.g. one or more of examples 31-35), wherein the set of frequency rotation values are determined, for each one of the plurality of channel configurations, based upon a selection of frequency rotation values that results in a lowest maximum PAPR value from among the predetermined number of combinations of frequency rotation values.
Another example (e.g. example 37) relates to a previously-described example (e.g. one or more of examples 31-36), wherein the communication protocol comprises an Institute of Electrical and Electronics Engineers (IEEE) 802.be communication standard.
Another example (e.g. example 38) relates to a previously-described example (e.g. one or more of examples 31-37), wherein the plurality of sub-channels have a bandwidth of 20 MHz.
Another example (e.g. example 39) relates to a previously-described example (e.g. one or more of examples 31-38), wherein the wireless channel has a bandwidth of 160 MHz or 320 MHz.
Another example (e.g. example 40) relates to a previously-described example (e.g. one or more of examples 31-39), wherein the plurality of channel configurations comprise a channel configuration that identifies a plurality of sub-channels within the wireless channel in accordance with the communication protocol, with two or more of the plurality of sub-channels being punctured at a respective spectral location within the wireless channel.
An apparatus as shown and described.
A method as shown and described.
The aforementioned description of the specific aspects will so fully reveal the general nature of the disclosure that others can, by applying knowledge within the skill of the art, readily modify and/or adapt for various applications such specific aspects, without undue experimentation, and without departing from the general concept of the present disclosure. Therefore, such adaptations and modifications are intended to be within the meaning and range of equivalents of the disclosed aspects, based on the teaching and guidance presented herein. It is to be understood that the phraseology or terminology herein is for the purpose of description and not of limitation, such that the terminology or phraseology of the present specification is to be interpreted by the skilled artisan in light of the teachings and guidance.
References in the specification to “one aspect.” “an aspect.” “an exemplary aspect,” etc., indicate that the aspect described may include a particular feature, structure, or characteristic, but every aspect may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same aspect. Further, when a particular feature, structure, or characteristic is described in connection with an aspect, it is submitted that it is within the knowledge of one skilled in the art to affect such feature, structure, or characteristic in connection with other aspects whether or not explicitly described.
The exemplary aspects described herein are provided for illustrative purposes, and are not limiting. Other exemplary aspects are possible, and modifications may be made to the exemplary aspects. Therefore, the specification is not meant to limit the disclosure. Rather, the scope of the disclosure is defined only in accordance with the following claims and their equivalents.
Aspects may be implemented in hardware (e.g., circuits), firmware, software, or any combination thereof. Aspects may also be implemented as instructions stored on a machine-readable medium, which may be read and executed by one or more processors. A machine-readable medium may include any mechanism for storing or transmitting information in a form readable by a machine (e.g., a computing device). For example, a machine-readable medium may include read only memory (ROM); random access memory (RAM); magnetic disk storage media; optical storage media; flash memory devices; electrical, optical, acoustical or other forms of propagated signals (e.g., carrier waves, infrared signals, digital signals, etc.), and others. Further, firmware, software, routines, instructions may be described herein as performing certain actions. However, it should be appreciated that such descriptions are merely for convenience and that such actions in fact results from computing devices, processors, controllers, or other devices executing the firmware, software, routines, instructions, etc. Further, any of the implementation variations may be carried out by a general purpose computer.
For the purposes of this discussion, the term “processing circuitry” or “processor circuitry” shall be understood to be circuit(s), processor(s), logic, or a combination thereof. For example, a circuit can include an analog circuit, a digital circuit, state machine logic, other structural electronic hardware, or a combination thereof. A processor can include a microprocessor, a digital signal processor (DSP), or other hardware processor. The processor can be “hard-coded” with instructions to perform corresponding function(s) according to aspects described herein. Alternatively, the processor can access an internal and/or external memory to retrieve instructions stored in the memory, which when executed by the processor, perform the corresponding function(s) associated with the processor, and/or one or more functions and/or operations related to the operation of a component having the processor included therein.
In one or more of the exemplary aspects described herein, processing circuitry can include memory that stores data and/or instructions. The memory can be any well-known volatile and/or non-volatile memory, including, for example, read-only memory (ROM), random access memory (RAM), flash memory, a magnetic storage media, an optical disc, erasable programmable read only memory (EPROM), and programmable read only memory (PROM). The memory can be non-removable, removable, or a combination of both.
