This application is related to and claims the benefit of Chinese Patent Application Number 201510033731.0 filed on Jan. 22, 2015, the contents of which are herein incorporated by reference in their entirety.
The present disclosure relates to the field of communication, and in particular to a sending method and device.
Synchronization signal detection is required before synchronization is established between a system side and User Equipment (UE) in wireless communication. A synchronization signal is required to have characteristics of higher self-correlation and lower cross-correlation, so that the UE can be ensured to access a base station under the condition of low Signal to Interference plus Noise Ratio (SINR). When synchronization signals are designed, a primary synchronization signal and a secondary synchronization signal are generally designed. The primary synchronization signal is used for rough synchronization, and the secondary synchronization signal is used for accurately determining a frame synchronization location. At present, when a base station sends signals, synchronization signals and some signals other than the synchronization signals are processed together on line, and the sending manner of the synchronization signals is relatively undiversified.
For the problem of relatively undiversified signal sending manner in a related technology, there is yet no effective solution.
The embodiments of the present disclosure provide a sending method and device, so as to at least solve the problem of relatively undiversified signal sending manner in the related technology.
According to one aspect of the embodiments of the present disclosure, a sending method is provided, which may include: acquiring one or more time-domain signals corresponding to one or more frequency-domain signals except primary synchronization frequency-domain signals; determining one primary synchronization time-domain signal in at least two pre-stored primary synchronization time-domain signals and performing weighted processing on the determined primary synchronization time-domain signal; and sending a signal which is obtained by adding the weighted primary synchronization time-domain signal and the one or more time-domain signals.
In an example embodiment, acquiring the one or more time-domain signals corresponding to the one or more frequency-domain signals except the primary synchronization frequency-domain signals may include: generating the one or more frequency-domain signals except the primary synchronization frequency-domain signals, and acquiring the one or more time-domain signals by converting the generated one or more frequency-domain signals.
In an example embodiment, before determining one primary synchronization time-domain signal in the at least two pre-stored primary synchronization time-domain signals and performing the weighted processing on the determined primary synchronization time-domain signal, the method may further include: converting the primary synchronization frequency-domain signals into the at least two primary synchronization time-domain signals; and storing the at least two primary synchronization time-domain signals obtained by the conversion.
In an example embodiment, determining one primary synchronization time-domain signal in the at least two pre-stored primary synchronization time-domain signals and performing the weighted processing on the determined primary synchronization time-domain signal may include: selecting one primary synchronization time-domain signal from the at least two pre-stored primary synchronization time-domain signals according to a cell Identifier (ID), and performing power and phase weighted processing on the selected primary synchronization time-domain signal.
In an example embodiment, selecting one primary synchronization time-domain signal from the at least two pre-stored primary synchronization time-domain signals according to the cell ID, and performing the power and phase weighted processing on the selected primary synchronization time-domain signal may include: selecting one primary synchronization time-domain signal from the at least two pre-stored primary synchronization time-domain signals according to the cell ID, and multiplying the selected primary synchronization time-domain signal by a complex number to regulate power of the primary synchronization time-domain signal and an initial phase of the primary synchronization time-domain signal.
According to the other aspect of the embodiments of the present disclosure, a sending device is provided, which may include: an acquisition component, which may be configured to acquire one or more time-domain signals corresponding to one or more frequency-domain signals except primary synchronization frequency-domain signals; a weighted processing component, which may be configured to determine one primary synchronization time-domain signal in at least two pre-stored primary synchronization time-domain signals and performing weighted processing on the determined primary synchronization time-domain signal; and a sending component, which may be configured to send a signal which is obtained by adding the weighted primary synchronization time-domain signal and the one or more time-domain signals.
In an example embodiment, the acquisition component may include: an acquisition sub-component, which may be configured to generate the one or more frequency-domain signals except the primary synchronization frequency-domain signals, and acquire the one or more time-domain signals by converting the generated one or more frequency-domain signals.
In an example embodiment, the device may further include: a conversion component, which may be configured to convert the primary synchronization frequency-domain signals into the at least two primary synchronization time-domain signals; and a storage component, which may be configured to store the at least two primary synchronization time-domain signals obtained by the conversion.
In an example embodiment, the weighted processing component may include: a weighted processing sub-component, which may be configured to select one primary synchronization time-domain signal from the at least two pre-stored primary synchronization time-domain signals according to a cell ID, and perform power and phase weighted processing on the selected primary synchronization time-domain signal.
In an example embodiment, the weighted processing sub-component may include: a processing element, which may be configured to select one primary synchronization time-domain signal from the at least two pre-stored primary synchronization time-domain signals according to the cell ID, and multiply the selected primary synchronization time-domain signal by a complex number to regulate power of the primary synchronization time-domain signal and an initial phase of the primary synchronization time-domain signal.
According to the technical solution of the present disclosure, one or more time-domain signals corresponding to one or more frequency-domain signals except the primary synchronization frequency-domain signals are acquired; one primary synchronization time-domain signal is determined in the at least two pre-stored primary synchronization time-domain signals and weighted processing is performed on the determined primary synchronization time-domain signal; and the one or more time-domain signals and the weighted primary synchronization time-domain signal are added and then sent. By virtue of the above technical solution, the problem of relatively undiversified signal sending manner in the related technology is solved, and diversified sending manners are implemented.
Drawings described here are adopted to provide further understanding of the present disclosure, and form a part of the present disclosure. Schematic embodiments of the present disclosure and description thereof are adopted to explain the present disclosure, and do not form improper limits to the present disclosure. In the drawings:
The present disclosure is described below with reference to the drawings and the embodiments in detail. It is important to note that the embodiments in the present disclosure and characteristics in the embodiments may be combined under the condition of no conflicts.
An embodiment provides a sending method.
Step S102: one or more time-domain signals corresponding to one or more frequency-domain signals except primary synchronization frequency-domain signals may be acquired.
There may be many manners for acquiring the one or more time-domain signals corresponding to the one or more frequency-domain signals except the primary synchronization frequency-domain signals. In one embodiment, the one or more frequency-domain signals except the primary synchronization frequency-domain signals may be generated, and the one or more time-domain signals may be acquired by converting the generated one or more frequency-domain signals. During practical application, in order to improve the applicability of the method, the one or more physical time-domain signals except the primary synchronization signals may be generated according to a 3GPP LTE protocol, wherein the time-domain signal may include a Cyclic Prefix (CP) part, or may not include a CP part.
Step S104: one primary synchronization time-domain signal may be determined in at least two pre-stored primary synchronization time-domain signals and weighted processing is performed on the determined primary synchronization time-domain signal.
There may be many manners for determining one primary synchronization time-domain signal in the at least two pre-stored primary synchronization time-domain signals. In an embodiment, one primary synchronization time-domain signal may be selected from the at least two pre-stored primary synchronization time-domain signals according to a cell ID.
A corresponding relationship for selecting the local primary synchronization signal according to the cell ID may be as follows: NID(2) may be calculated according to the cell ID, NIDcell=3NID(1)+NID(2), a root sequence u may be determined according to NID(2), then the primary synchronization signal time-domain sequence may be determined, as shown in Table 1.
There may be many manners for performing the power and phase weighted processing on the selected primary synchronization time-domain signal. In an embodiment, the selected primary synchronization time-domain signal may be multiplied by a complex number to regulate power of the primary synchronization time-domain signal and an initial phase of the primary synchronization time-domain signal. A specific implementation is described below.
The power and phase weighted processing performed on the synchronization signal may refer to performing complex multiplication of a weight factor of the synchronization signal and the synchronization signal. w represents the weight factor, and w for different sending antennae may be different. In an embodiment, weighted processing may be performed by virtue of a formula as follows: tu(m)=tu(m)·w.
As an example embodiment, the at least two pre-stored primary synchronization time-domain signals used in the current step S104 may be stored in advance. The at least two primary synchronization time-domain signals may be obtained by converting the primary synchronization frequency-domain signals; after the conversion, the at least two primary synchronization time-domain signals obtained through the conversion may be stored, so that the operational complexity of a base station side is lowered. During practical application, there may be multiple primary synchronization time-domain signals stored locally in advance, for example, three primary synchronization time-domain signals may be locally pre-stored, wherein each signal may include a CP, or may not include a CP.
The primary synchronization frequency-domain signal du(n) may be generated by virtue of a formula as follows:
wherein u may adopt three values, i.e. 25, 29 and 34.
Primary synchronization frequency-domain signal resource mapping may be implemented by virtue of a formula as follows:
N is the number of sampling points in one Orthogonal Frequency Division Multiplexing (OFDM) symbol, not including a CP.
The primary synchronization frequency-domain signal may be converted to the time domain, and may be stored:
t
u(m)=IFFT(au,k),k=0, . . . N−1,m=0, . . . N−1
wherein IFFT represents Inverse Fast Fourier Transform.
For a primary synchronization time-domain signal including a CP, each time-domain signal may be added with a CP according to the following formula:
wherein l represents an index of the OFMD symbol, on which the primary synchronization signal is mapped, specified in a 3GPP protocol, Ncp,l represents the length of the CP of the OFDM symbol l, and its value is specified in LTE protocol 36.211.
Step S106: one or more signals which are obtained by adding the weighted primary synchronization time-domain signal and the one or more time-domain signals are sent.
There may be many implementation manners for step S106. For example, the one or more LTE time-domain signals and the weighted primary synchronization time-domain signal may be added and then sent through an air interface. Two specific example implementations of step S106 respectively aiming at signals without a CP and signals with a CP are described below.
For signals not including a CP
If the one or more LTE time-domain signals, except the primary synchronization signals, are set to be s(m), the superposition of the time-domain signals in Step S106 may be expressed by virtue of a formula as follows. s′(l,m)=s(l,m)+tu(m),m=0, 1 . . . N−1, wherein l represents an index of the OFDM symbol, on which the primary synchronization signal is mapped, specified in the 3GPP protocol.
Time-domain superposition may require the addition of a CP before the signal can be sent through the air interface.
wherein Ncp,l represents the length of the CP of the OFDM symbol l, and its value is specified in LTE protocol 36.211.
For Signals Including a CP
If the obtained one or more LTE time-domain signals except the primary synchronization signals are set to be s(m), the superposition of the time-domain signals in step S106 may be expressed by virtue of a formula as follows. s′(l,m)=s(l,m)+tu,cp(m), m=0, 1 . . . N+Ncp,l−1, wherein l represents the index of the OFDM symbol, on which the primary synchronization signal is mapped, specified in the 3GPP protocol.
The signals may be sent through the air interface after time-domain addition.
By the steps, one or more time-domain signals corresponding to one or more frequency-domain signals except the primary synchronization frequency-domain signals are acquired; one primary synchronization time-domain signal is determined in the at least two pre-stored primary synchronization time-domain signals and weighted processing is performed on the determined primary synchronization time-domain signal; and the one or more time-domain signals and the weighted primary synchronization time-domain signal are added and then sent, so that the problem of relatively undiversified signal sending manner in the related technology is solved, and diversified sending manners are implemented.
Another embodiment of the present disclosure further provides a sending device, the device is configured to implement the embodiment and example implementation modes as mentioned above, and what has been described will not be repeated. For example, a term “component”, used below, is a combination of software and/or hardware for realizing preset functions. The device described in the following embodiment is preferably implemented by software, but the implementation of the device with hardware or the combination of software and hardware is also possible and conceived.
The acquisition component 22 may be configured to acquire one or more time-domain signals corresponding to one or more frequency-domain signals except primary synchronization frequency-domain signals;
the weighted processing component 24 may be configured to determine one primary synchronization time-domain signal in at least two pre-stored primary synchronization time-domain signals and perform weighted processing on the determined primary synchronization time-domain signal; and
the sending component 26 may be configured to send a signal which is obtained by adding the weighted primary synchronization time-domain signal and the one or more time-domain signals.
an acquisition sub-component 32, which may be configured to generate the one or more frequency-domain signals except the primary synchronization frequency-domain signals, and acquire the one or more time-domain signals by converting the generated one or more frequency-domain signals.
a conversion component 42, which may be configured to convert the primary synchronization frequency-domain signals into the at least two primary synchronization time-domain signals; and
a storage component 44, which may be configured to store the at least two primary synchronization time-domain signals obtained by the conversion.
a weighted processing sub-component 52, which may be configured to select one primary synchronization time-domain signal from the at least two pre-stored primary synchronization time-domain signals according to a cell ID, and perform power and phase weighted processing on the selected primary synchronization time-domain signal.
a processing element 62, which may be configured to select one primary synchronization time-domain signal from the at least two pre-stored primary synchronization time-domain signals according to the cell ID, and multiply the selected primary synchronization time-domain signal by a complex number to regulate power of the primary synchronization time-domain signal and an initial phase of the primary synchronization time-domain signal.
The embodiment of the present disclosure is further described below. In one embodiment, it is provided a sending method for an LTE primary synchronization signal, which may include: locally pre-storing three primary synchronization signal time-domain sequences off line; generating one or more physical time-domain signals except the primary synchronization signals according to a 3rd Generation Partnership Project (3GPP) LTE protocol; selecting one primary synchronization signal from the three local time-domain primary synchronization signals according to a cell ID, and performing related power and phase weighted processing on the selected primary synchronization signal; and adding the primary synchronization signal and the one or more time-domain signals except the LTE primary synchronization signals and sending the signal obtained by the addition through an air interface. The 3GPP LTE protocol may include 36.211-36.213, and a physical cell NIDcell may be represented as NIDcell=3NID(1)+NID(2).
The power and phase weighted processing performed on the primary synchronization signal may refer to regulating power of the synchronization signal sequence and regulating an initial phase of the sequence, which may adopt more than one implementation manner, for example, the weighted processing may be implemented by multiplying the primary synchronization signal by a complex number.
Another embodiment of the present disclosure further provides a computer readable storage medium which records program codes which, when executed, allow a computer to perform function including:
acquiring one or more time-domain signals corresponding to one or more frequency-domain signals except primary synchronization frequency-domain signals;
determining one primary synchronization time-domain signal in at least two pre-stored primary synchronization time-domain signals and performing weighted processing on the determined primary synchronization time-domain signal; and
sending a signal which is obtained by adding the weighted primary synchronization time-domain signal and the one or more time-domain signals.
Step S702: three primary synchronization time-domain signals may be locally pre-stored, wherein each signal does not include a Cyclic Prefix (CP).
The primary synchronization frequency-domain signal du(n) may be generated by virtue of a formula as follows:
wherein u may adopt three values, i.e. 25, 29 and 34.
Primary synchronization frequency-domain signal resource mapping may be implemented by virtue of a formula as follows:
N is the number of sampling points in one Orthogonal Frequency Division Multiplexing (OFDM) symbol, not including a CP.
The primary synchronization frequency-domain signal may be converted to the time domain, and may be stored:
t
u(m)=IFFT(au,k),k=0, . . . N−1,m=0, . . . N−1
wherein IFFT represents Inverse Fast Fourier Transform.
Step S704: one or more physical time-domain signals except the primary synchronization signals may be generated according to a 3GPP LTE protocol, the time-domain signal not including a CP part.
Step S706: a local primary synchronization time-domain signal may be selected according to a cell ID and related power and phase weighted processing may be performed on the selected primary synchronization time-domain signal.
A corresponding relationship for selecting the local primary synchronization signal according to the cell ID may be as follows: NID(2) may be calculated according to the cell ID, NIDcell=3NID(1)+NID(2), a root sequence u may be determined according to NID(2), then the primary synchronization signal time-domain sequence may be determined, as shown in Table 2.
The power and phase weighted processing performed on the synchronization signal may refer to performing complex multiplication of a weight factor of the synchronization signal and the synchronization signal. w represents the weight factor, and w for different sending antennae may be different. In an embodiment, weighted processing may be performed by virtue of a formula as follows: tu(m)=tu(m)·w.
Step S708: the one or more LTE time-domain signals obtained in Step S704 and the primary synchronization time-domain signal obtained in Step S706 may be added and then sent through an air interface.
If the one or more LTE time-domain signals, except the primary synchronization signals, obtained in Step S704 are set to be s(m), the superposition of the time-domain signals in Step S708 may be expressed by virtue of a formula as follows. s′(l,m)=s(l,m)+tu(m), m=0, 1 . . . N−1, wherein l represents an index of the OFDM symbol, on which the primary synchronization signal is mapped, specified in the 3GPP protocol.
Time-domain superposition may require the addition of a CP before the signal can be sent through the air interface.
wherein Ncp,l represents the length of the CP of the OFDM symbol l, and its value is specified in LTE protocol 36.211.
By the steps, the synchronization signal can be sent in an LTE base station, so that UE may be synchronized with the base station in a wireless channel, and a requirement of the system is met.
Three primary synchronization time-domain signals may be locally pre-stored, each primary synchronization time-domain signal including a CP, the step may include:
a primary synchronization frequency-domain signal du(n) may be generated by virtue of a formula as follows:
wherein u may adopt three values, i.e. 25, 29 and 34.
Primary synchronization frequency-domain signal resource mapping may be implemented by virtue of a formula as follows:
N is the number of sampling points in one OFDM symbol, not including a CP.
The primary synchronization frequency-domain signal may be converted to the time domain, and may be stored:
t
u(m)=IFFT(au,k),k=0, . . . N−1,m=0, . . . N−1
wherein IFFT represents Inverse Fast Fourier Transform.
Each time-domain signal may be added with a CP:
wherein l represents an index of the OFMD symbol, on which the primary synchronization signal is mapped, specified in a 3GPP protocol, Ncp,l represents the length of the CP of the OFDM symbol l, and its value is specified in LTE protocol 36.211.
One or more physical time-domain signals except the primary synchronization signals may be generated according to a 3GPP LTE protocol, each time-domain signal including a CP part.
A local primary synchronization signal may be selected according to a cell ID and related power and phase weighted processing may be performed on the selected primary synchronization signal. A corresponding relationship for selecting the local primary synchronization signal according to the cell ID may be as follows: NID(2) may be calculated according to the cell ID, NIDcell=3NID(1)+NID(2), a root sequence u may be determined according to NID(2), then the primary synchronization signal time-domain sequence may be determined, as shown in Table 3.
The power and phase weighted processing performed on the synchronization signal may refer to performing complex multiplication of a weight factor of the synchronization signal and the synchronization signal.
The obtained one or more LTE time-domain signals and the primary synchronization time-domain signal may be added and then sent through an air interface.
If the obtained one or more LTE time-domain signals except the primary synchronization signals are set to be s(m), the superposition of the time-domain signals may be expressed by virtue of a formula as follows. s′(l,m)=s(l,m)+tu,cp(m), m=0, 1 . . . N+Ncp,l−1, wherein l represents the index of the OFDM symbol, on which the primary synchronization signal is mapped, specified in the 3GPP protocol. The signals may be sent through the air interface after time-domain addition.
This example embodiment provides a hardware implementation of the sending method using a general purpose computing device and program codes.
The acquisition component 22 or the acquisition sub-component 32 in the forgoing embodiments may be implemented in the following manner: the processor 822 reads from the storage unit 824 the corresponding program codes for acquiring the one or more time-domain signals or for generating and converting the frequency domain signals and executes the program codes.
The weighted processing component 24 or the weighted processing sub-component 52 or the processing element 62 in the forgoing embodiments may be implemented in the following manner: the processor 822 reads from the storage unit 824 the corresponding program codes for determining one primary synchronization time-domain signal and performing weighted processing and executes the program codes.
The sending component 26 in the forgoing embodiments may be implemented in the following manner: the processor 822 reads from the storage unit 824 the corresponding program codes for adding the time-domain signals and sending the result and executes the program codes.
The conversion component 42 in the forgoing embodiments may be implemented in the following manner: the processor 822 reads from the storage unit 824 the corresponding program codes for converting the primary synchronization frequency-domain signals into primary synchronization time-domain signals and executes the program codes.
The storage component 44 in the forgoing embodiments may be implemented by using the storage unit 824.
Apparently, those skilled in the art should know that each component or step of the present disclosure may be implemented by a universal computing device, and the components or steps may be concentrated on a single computing device or distributed on a network formed by at least two computing devices, and may be implemented by programmable codes executable for the computing devices, so that the components or steps may be stored in a storage device for execution with the computing devices. Moreover, the shown or described steps may be executed in a sequence different from that described here under a certain condition, or may form each integrated circuit component, or at least two components or steps therein may form a single integrated circuit component for implementation.
The present embodiment provides another hardware implementation of the sending method.
As shown in
The hardware implementation described above may be practically implemented in various kinds of hardware, for example, it may be implemented by using a Field-Programmable Gate Array (FPGA), a Digital Signal Processing (DSP), an Application-Specific Integrated Circuit (ASIC) or a packaged chip.
Under some circumstances, the shown or described steps may be executed in a sequence different from that described here, or may form each integrated circuit component, or at least two components or steps therein may form a single integrated circuit component for implementation.
Apparently, those skilled in the art would understand that the implementation manner using a general-purpose computing device and program codes and the implementation manner using hardware can be combined, that is, some of the components may be made into a hardware component, such as FPGA circuit component or ASIC component, while others may be implemented using the general-purpose computing device and the program codes, especially when the hardware component can execute these functional components faster. The implementation manners designed by the skilled in the art under such a condition should also fall within the patent scope of the present application. As a consequence, the present disclosure is not limited to any specific hardware and software combination.
The above is only the example embodiment of the present disclosure and not intended to limit the present disclosure, and for those skilled in the art, the present disclosure may have various modifications and variations. Any modifications, equivalent replacements, improvements and the like within the principle of the present disclosure shall fall within the scope of protection defined by the claims of the present disclosure.
Number | Date | Country | Kind |
---|---|---|---|
201510033731.0 | Jan 2015 | CN | national |