Patent Application
20100069125
The present invention relates to a transceiver and a transceiving method in an ultra wide band (UWB) system for frequency sharing, and more particularly, to a transceiver and a transceiving method in an UWB system capable of frequency sharing with an external device by selectively controlling transmission power in order to reduce an interference effect that can be generated by the external device.
Referring to Korean Patent Application No. 10-2003-0029130 (‘UWB transceiver for dynamically reducing interference and transceiving method therefor’, filed on Nov. 16, 2006), a conventional ultra wide band (UWB) transceiver includes a stop band filter or a low noise amplifier (LNA) for each frequency channel band, and when a signal of a conventional communication system using the corresponding frequency band is detected, the appropriate stop band filter is turned on or the LNA is turned off in order to protect an external system from an interference effect caused by the UWB transciever.
By using a constitution which turns on and off transmission power in a frequency band overlapping with a frequency band of a wireless communication, interference in a UWB system that can be generated in the frequency band overlapping with the frequency band of the wireless communication can be prevented.
That is, when the frequency bands entirely overlap each other, transmission in the UWB system is completely cut off so that an interference effect is not generated in the external system.
However, in the UWB system using the corresponding frequency channel, the frequency channel should be moved to another frequency channel or the transmission should be stopped for a while.
The present invention provides a transceiver and a transceiving method in an ultra wide band (UWB) system for reducing interference generated by an external system due to an external apparatus.
According to an aspect of the present invention, there is provided a transceiver for use in an ultra wide band (UWB) system for reducing interference that can be generated by an external system, wherein the ultra wide band system and the external system are in a frequency sharing environment, the transceiver comprising: an external signal detector which detects an external signal generated by the external system; and a transmission signal controller which determines a power level of a transmission signal to be transmitted by the transceiver based on a power level of the detected external signal, in the case where an external signal using the same frequency channel as the ultra band system is detected.
According to another aspect of the present invention, there is provided a transceiving method for use in an ultra wide band system for reducing interference that can be generated by an external system, wherein the ultra wide band system and the external system are in a frequency sharing environment, the transceiving method comprising: an external signal detection operation which detects an external signal generated by the external system; and a transmission signal control operation which determines a power level of a transmission signal to be transmitted by the transceiver based on a power level of the detected external signal in the case where an external signal using the same frequency channel as the ultra band system is detected.
As described above, the interference probability is decreased in the present invention and thus the UWB system and the external system can share the same frequency channel simultaneously without significant interference.
As described above, using the transceiver and the transceiving method of the UWB system for frequency sharing according to the present invention, an interference effect generated in the UWB system due to an external system can be remarkably reduced.
Since the interference effect generated in the UWB system is reduced, the UWB system and the external system can share the same frequency channel without significant interference in a frequency sharing environment.
UWB system according to an embodiment of the present invention;
According to an aspect of the present invention, there is provided a transceiver for use in an ultra wide band (UWB) system for reducing interference that can be generated by an external system, wherein the ultra wide band system and the external system are in a frequency sharing environment, the transceiver comprising: an external signal detector which detects an external signal generated by the external system; and a transmission signal controller which determines a power level of a transmission signal to be transmitted by the transceiver based on a power level of the detected external signal, in the case where an external signal using the same frequency channel as the ultra band system is detected.
According to another aspect of the present invention, there is provided a transceiving method for use in an ultra wide band system for reducing interference that can be generated by an external system, wherein the ultra wide band system and the external system are in a frequency sharing environment, the transceiving method comprising: an external signal detection operation which detects an external signal generated by the external system; and a transmission signal control operation which determines a power level of a transmission signal to be transmitted by the transceiver based on a power level of the detected external signal in the case where an external signal using the same frequency channel as the ultra band system is detected.
Hereinafter, the present invention will be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown.
(UWB) system according to an embodiment of the present invention. Referring to
The receiver 110 receives an external signal, which is a signal transmitted from an external device such as a similar UWB system or a heterogeneous communication system.
The external signal detector 120 checks whether the external signal uses the same frequency channel as the UWB system.
The transmission signal controller 130 determines a power level of a transmission signal of the UWB system based on a power level of the detected external signal, when the external signal using the same frequency channel as the UWB system is detected.
The selective power generator 150 generates a power level of the transmission signal based on the power level determined in the transmission signal controller 130.
The maximum power generator 160 generates the maximum power level of the transmission signal when no external signal using the same frequency channel as the UWB system is detected.
The transmitter 170 transmits the transmission signal, in which the power is selectively regulated, or the transmission signal having the maximum power is transmitted.
The power level measurer 210 measurers a power level of an external signal (a signal generated by an external system) using the same frequency channel as the UWB system.
The power level comparer 220 determines a power level of the transmission signal by comparing the power level of the external signal and a preset threshold power level of the transmission signal.
That is, the power level comparer 220 compares a minimum threshold signal power level Pmin or a maximum threshold signal power level Pmax of the UWB system with a power level A of the external signal in order to determine an output power level (Pmin, A, or Pmax) of the transmission signal of the UWB system. Hereinafter, this will be described in detail.
Herein, A is the power level of the external signal, Pmin is the minimum threshold signal power level of the UWB system, Pmax is the maximum threshold signal power level of the UWB system, Ptpc is a power level of the transmission signal of the UWB system determined by the power level comparer 220.
When A<Pmin, Ptpc is Pmin. When Pmin<A<Pmax, Ptpc is A. When A>Pmax, Ptpc is Pmax.
That is, when the power level of the external signal A is smaller than a predetermined minimum threshold power level Pmin, the power level of the transmission signal Ptcp is determined to be the minimum threshold power level Pmin.
When the power level A of the external signal is larger than the minimum threshold power level Pmin and smaller than a predetermined maximum threshold power level Pmax, the power level of the transmission signal Ptcp is determined to be the same as the power level A of the external signal.
When the power level A of the external signal is larger than the maximum threshold power level Pmax, the power level of the transmission signal Ptcp is determined to be the maximum threshold power level Pmax.
First, it is determined whether an external signal generated from the external system exists. When an external signal using the same frequency channel as the UWB system is detected, a power level of a transmission signal of the UWB system is determined based on a power level of the detected external signal. Hereinafter, this will be described in detail.
In operation S301, it is determined whether an external signal using the same frequency channel as the UWB system is detected.
When an external signal using the same frequency channel as the UWB system is detected, the power level of the external signal using the same frequency channel is measured in operation 302.
The measured power level of the external signal and preset threshold power levels of the transmission signal are compared in operation S303 and the power level of the transmission signal is determined in operation S304.
An embodiment illustrating conditions for determining the power level of the transmission signal is as follows. When the power level of the external signal is smaller than a predetermined minimum threshold power level, the power level of the transmission signal is determined to be the minimum threshold power level.
When the power level of the external signal is larger than the minimum threshold power level and smaller than a predetermined maximum threshold power level, the power level of the transmission signal is determined to be the same as the power level of the external signal. When the power level of the external signal is larger than the maximum threshold power level, the power level of the transmission signal is determined to be the maximum threshold power level.
In operation S305, turning on/off of the transmission signal is selected based on a preset duty cycle. In operation S306, the power level of the transmission signal is selectively generated based on the power level determination of operation S304.
When no external signal using the same frequency channel as the UWB system is detected, the maximum power level that can be generated for the transmission signal is generated in operation S307, and then the transmission signal is transmitted.
Referring to
First, it is checked whether an external signal using the same frequency channel as the UWB system is received in operation S401. When an external signal using the same frequency channel is received, the received power level A of the external signal is measured in operation S402.
The power level A of the external signal is compared with a preset threshold power levels Pmin and Pmax of the transmission signal in order to determine the power level of the transmission signal in operation S403.
That is, the power level A of the external signal and the minimum threshold signal power level Pmin are compared in operation S403-1 and/or the power level A of the external signal and the maximum threshold signal power level Pmax are compared in operation S403-2 in order to determine an output power level (Pmin, A, or Pmax) of the transmission signal of the UWB system. Hereinafter, this will be described in detail.
Herein, A is the power level of the external signal, Pmin is the minimum threshold signal power level of the UWB system, Pmax is the maximum threshold signal power level of the UWB system, and Ptpc is the determined output power level of the transmission signal of the UWB system.
When A<Pmin, Ptpc is Pmin. When Pmin<A<Pmax, Ptpc is A. When A>Pmax, Ptpc is Pmax.
The power level of the transmission signal is selectively outputted in operation S404 based on the determined output power level (Pmin, A, or Pmax) of the transmission signal. When an external signal using the same frequency channel as the UWB system is not detected a transmission signal having the maximum power level Pmax can be generated and outputted in operation S405.
The duty cycle control operation uses a transmission power on/off selection switch, wherein an on/off switching ratio is regulated in operation S502-1 by applying a preset duty cycle and via a control signal generated by a timer.
First, a power level of a transmission signal is selectively outputted in operation S501 based on the output power level (Pmin, A, or Pmax) of the transmission signal determined in the transmission signal control operation.
The on/off switching ratio is regulated in operation S502 by applying the preset duty cycle and via the control signal generated by the timer.
In operation S503, an output of the duty cycle control operation is Psel when the transmission power is turned on, and an output of the duty cycle control operation is Poff when the transmission power is turned off.
Referring to
The graph of
Referring to
As described above, the interference probability is decreased in the present invention and thus the UWB system and the external system can share the same frequency channel simultaneously without significant interference.
The invention can also be embodied as computer readable code on a computer readable recording medium. The computer readable recording medium is any data storage device that can store data which can be thereafter read by a computer system.
Examples of the computer readable recording medium include read-only memory (ROM), random-access memory (RAM), CD-ROMs, magnetic tapes, floppy disks, optical data storage devices, and carrier waves (such as data transmission through the Internet). The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion.
As described above, using the transceiver and the transceiving method of the UWB system for frequency sharing according to the present invention, an interference effect generated in the UWB system due to an external system can be remarkably reduced.
Since the interference effect generated in the UWB system is reduced, the UWB system and the external system can share the same frequency channel without significant interference in a frequency sharing environment.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims.
The present invention provides a transceiver and a transceiving method in an ultra wide band (UWB) system for reducing interference generated by an external system due to an external apparatus.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2006-0113481 | Nov 2006 | KR | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/KR2007/002854 | 6/13/2007 | WO | 00 | 4/27/2009 |
