WO2024100787A1 - 無線通信トランシーバ - Google Patents

無線通信トランシーバ Download PDF

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Publication number
WO2024100787A1
WO2024100787A1 PCT/JP2022/041676 JP2022041676W WO2024100787A1 WO 2024100787 A1 WO2024100787 A1 WO 2024100787A1 JP 2022041676 W JP2022041676 W JP 2022041676W WO 2024100787 A1 WO2024100787 A1 WO 2024100787A1
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Prior art keywords
signal
frequency
output
beat
mixer
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PCT/JP2022/041676
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English (en)
French (fr)
Japanese (ja)
Inventor
照男 徐
大祐 来山
宏行 高橋
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日本電信電話株式会社
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Application filed by 日本電信電話株式会社 filed Critical 日本電信電話株式会社
Priority to JP2024556906A priority Critical patent/JPWO2024100787A1/ja
Priority to PCT/JP2022/041676 priority patent/WO2024100787A1/ja
Publication of WO2024100787A1 publication Critical patent/WO2024100787A1/ja

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits

Definitions

  • the present invention relates to a wireless communication transceiver.
  • the frequencies of the LO (Local Oscillator) signals in the RF (Radio Frequency) and IF (Intermediate Frequency) bands must be synchronized between the transmitter and receiver.
  • the LO signal generators installed in the transmitter and receiver respectively do not usually have sufficient frequency stability or precision, so there is a frequency error (frequency offset) in the LO signals between the transmitter and receiver. For this reason, the frequency offset must be compensated for on the receiver side.
  • Methods for compensating for the frequency offset in the RF band include a method using a carrier recovery circuit as shown in Figure 8 (see Non-Patent Document 1) and a method using a delay device (see Non-Patent Document 2).
  • the receiver shown in FIG. 8 is composed of an antenna 100 that receives an RF signal, a splitter 101 that splits the RF signal received by the antenna 100 into two, a carrier recovery circuit 102 that extracts phase and frequency information from one of the RF signals split by the splitter 101 and regenerates a carrier (LO signal), a mixer 103 that mixes the other RF signal split by the splitter 101 with the regenerated carrier to generate an IF signal, an analog-to-digital converter (ADC) 104 that converts the IF signal output from the mixer 103 into a digital signal, a frequency offset compensation unit 105 that compensates for the frequency offset of the IF signal by digital processing, and a demodulation unit 106 that converts the IF signal into a baseband signal.
  • ADC analog-to-digital converter
  • one of the RF signals split by the splitter is input to a delay device, and the other RF signal split by the splitter is input to a variable phase shifter, and the RF signal that has passed through the delay device and the RF signal that has passed through the variable phase shifter are mixed by a mixer.
  • the present invention has been made to solve the above problems, and aims to provide a wireless communication transceiver that can compensate for the frequency offset of the RF band LO signal between the transmitter and receiver while preventing signal attenuation and deterioration of the noise figure.
  • the wireless communication transceiver of the present invention is characterized by comprising an antenna configured to receive an RF signal sent from a transmitter, an LO signal generating unit configured to generate an LO signal, a mixer configured to mix the RF signal received by the antenna with the LO signal to generate an IF signal, a splitter configured to split the IF signal output from the mixer, a filter configured to filter one of the IF signals split by the splitter and pass a beat signal between the LO signal included in the RF signal and the LO signal output from the LO signal generating unit, a frequency counter configured to detect the frequency of the beat signal, and a control unit configured to control the frequency of the LO signal output from the LO signal generating unit so that the frequency of the beat signal falls within a predetermined tolerance range.
  • the present invention by providing an LO signal generating section, a splitter, a filter, a frequency counter, and a control section, it is possible to compensate for the frequency offset of the RF band LO signal between the transmitter and receiver, and to prevent signal attenuation and deterioration of the noise figure. Furthermore, with the present invention, there is no need to add a high-precision carrier recovery circuit or delay device that operates in the RF band.
  • FIG. 1 is a block diagram showing the configuration of a receiver of a wireless communication transceiver according to a first embodiment of the present invention.
  • FIG. 2 is a block diagram showing the configuration of an LO signal generating section according to the first embodiment of the present invention.
  • FIG. 3 is a flowchart illustrating the operation of the control unit according to the second embodiment of the present invention.
  • FIG. 4 is a block diagram showing the configuration of a receiver of a wireless communication transceiver according to a third embodiment of the present invention.
  • FIG. 5 is a block diagram showing the configuration of a transmitter of a wireless communication transceiver according to a fifth embodiment of the present invention.
  • FIG. 1 is a block diagram showing the configuration of a receiver of a wireless communication transceiver according to a first embodiment of the present invention.
  • FIG. 2 is a block diagram showing the configuration of an LO signal generating section according to the first embodiment of the present invention.
  • FIG. 3 is a flowchart illustrating the operation of the
  • FIG. 6 is a block diagram showing an example of the configuration of a level-adjusted signal generating section according to the fifth embodiment of the present invention.
  • FIG. 7 is a block diagram showing an example of the configuration of a DSP or a computer that realizes the receiver according to the first to fourth embodiments of the present invention.
  • FIG. 8 is a block diagram showing an example of the configuration of a conventional receiver.
  • the IF signal down-converted by the mixer is split.
  • Frequency offset information is extracted from one of the split IF signals by a low-pass filter (LPF) and a frequency counter.
  • LPF low-pass filter
  • the frequency error of the LO signal between the transmitter and receiver can be compensated for.
  • the signal is split in the IF band where signal attenuation is small, making it possible to prevent the problems of signal attenuation and deterioration of the noise figure that were previously an issue.
  • a mixer for data communications can be used as is to extract frequency offset information, so there is no need to add a high-precision carrier recovery circuit or delay device that operates in the RF band.
  • Fig. 1 is a block diagram showing the configuration of a receiver of a wireless communication transceiver according to a first embodiment of the present invention.
  • the receiver of this embodiment comprises an antenna 200 for receiving an RF signal sent from a transmitter, an LO signal generating section 201 for generating an LO signal (LORX) that serves as a carrier wave, a mixer 202 for generating an IF signal by mixing the RF signal received by the antenna 200 with the LO signal output from the LO signal generating section 201, a splitter 203 for splitting the IF signal output from the mixer 202, an LPF 204 for low-pass filtering one of the IF signals split by the splitter 203 to pass a beat signal, a frequency counter 205 for detecting the frequency of the beat signal, and a beat filter 206 for filtering the beat signal.
  • LORX LO signal
  • ADC analog-to-digital converter
  • 300 indicates the frequency spectrum of the RF signal received by antenna 200
  • 301 indicates the frequency spectrum of the RF band LO signal contained in the RF signal
  • 302 indicates the frequency spectrum of the IF signal output from mixer 202
  • 303 indicates the frequency spectrum of the beat signal contained in the IF signal
  • 304 indicates the frequency spectrum of the output signal from LPF 204.
  • the LO signal in an RF band included in an RF signal received by antenna 200 is abbreviated as LOTX
  • the LO signal in an RF band generated by LO signal generating unit 201 is abbreviated as LORX
  • the frequency of LOTX is abbreviated as fLOTX
  • the frequency of LORX is abbreviated as fLORX
  • a beat signal between the LOTX and LORX is contained in the IF signal down-converted by the mixer 202.
  • the frequency f beat of this beat signal is equal to the absolute value f offset of the frequency offset of the LO signal in the RF band.
  • the IF signal output from the mixer 202 is split by a splitter 203 , and one of the split IF signals is input to an LPF 204 .
  • the low-frequency frequency counter 205 detects the frequency f beat of the beat signal extracted by the LPF 204 .
  • the control unit 206 controls the frequency fLORX of the LORX output from the LO signal generating unit 201 so that the frequency fbeat detected by the frequency counter 205 becomes an foffset value that is acceptable for the receiver, specifically, so that the frequency fbeat falls within a predetermined acceptable range.
  • Fig. 2 is a block diagram showing a configuration example of the LO signal generating unit 201.
  • the LO signal generating unit 201 is composed of a voltage controlled oscillator (VCO) 2010 that generates an LO signal, and a frequency multiplier 2011 that multiplies the frequency of the LO signal output from the VCO 2010 by a predetermined multiplication factor and outputs the result as LORX.
  • VCO voltage controlled oscillator
  • the oscillation frequency of the VCO 2010 can be changed by adjusting the control voltage that the control unit 206 applies to the VCO 2010, and it is possible to control the frequency fLORX of the LORX.
  • the IF port of the mixer 202 is configured to pass a DC component. If the IF signal contains a large DC component that exceeds the input voltage resistance of the ADC 208, the ADC 208 may be destroyed. To prevent the ADC 208 from being destroyed, a DC blocking element 207 is inserted between the splitter 203 and the ADC 208.
  • LPF 204 is inserted between splitter 203 and frequency counter 205, but if frequency counter 205 itself has sufficient low-pass filtering characteristics, LPF 204 may be omitted.
  • a buffer may be inserted between splitter 203 and LPF 204.
  • Frequency offset compensation unit 209 can be realized by known technology.
  • frequency offset compensation unit 209 is realized in the IF band by digital processing using a method using a carrier recovery circuit disclosed in Non-Patent Document 1 or a method using a delay device disclosed in Non-Patent Document 2.
  • Fig. 3 is a flowchart explaining the operation of the control unit 206. Since the beat signal contains only information on the absolute value of the frequency difference between LOTX and LORX, it is first necessary to determine which of LOTX and LORX has a higher frequency.
  • the control unit 206 checks whether the frequency f beat detected by the frequency counter 205 is within a predetermined allowable range (steps S100 and S101 in FIG. 3). When the frequencies of LOTX and LORX are equal, the frequency f beat is 0. Therefore, the allowable range is a range close to 0, and if the allowable value indicating the upper limit of the frequency f beat is ⁇ , then the allowable range is 0 to ⁇ .
  • control unit 206 ends the control of the LO signal generating unit 201 (step S102 in FIG. 3). If the frequency f beat is not within the allowable range, the control unit 206 controls the LO signal generating unit 201 so that the frequency f LORX of the LORX increases by a predetermined amount (step S103 in FIG. 3).
  • the control unit 206 checks the frequency f beat after increasing the frequency f LORX (step S104 in FIG. 3), and when the frequency f beat is decreased from the value before increasing the frequency f LORX (Yes in step S105 in FIG. 3), checks whether the frequency f beat is within the allowable range (step S101). In this way, when the frequency f beat continues to decrease as a result of increasing the frequency f LORX , the processing of steps S101 to S105 is repeatedly performed until the frequency f beat is within the allowable range.
  • the control unit 206 controls the LO signal generating unit 201 so that the frequency f LORX decreases by a predetermined amount (step S106 in FIG. 3).
  • the control unit 206 checks whether the frequency f beat after decreasing the frequency f LORX is within the allowable range (steps S107 and S108 in FIG. 3).
  • steps S106 to S108 are repeated until the frequency f beat falls within the allowable range. If the frequency f beat falls within the allowable range, the control unit 206 ends the control of the LO signal generating unit 201 (step S109 in FIG. 3). The control unit 206 may start the process of step S100 at regular intervals.
  • Fig. 4 is a block diagram showing the configuration of a receiver of a wireless communication transceiver according to the third embodiment of the present invention, and the same components as those in Fig. 1 are given the same reference numerals.
  • the receiver of this embodiment comprises an antenna 200, an LO signal generating section 201, a mixer 202, a control section 206, an ADC 208a that converts the IF signal output from the mixer 202 into a digital signal, a frequency offset compensating section 209, a demodulating section 210, and a frequency detecting section 211 that detects the frequency f beat of a beat signal.
  • the frequency offset compensator 209 and the demodulator 210 can be realized by, for example, a DSP. If the DSP is equipped with a large-capacity storage device capable of observing a low-frequency signal such as a beat signal for a long period of time and storing the signal in real time, and if an ADC 208a having a sufficient input voltage resistance is available, the frequency f beat of the beat signal can be detected by digital processing.
  • the frequency detection unit 211 extracts low-frequency components by performing low-pass filtering using, for example, a Fourier transform on the digital signal obtained through the ADC 208a, and determines the frequency of the peak with the maximum intensity among the extracted low-frequency components as the frequency f beat of the beat signal.
  • the control unit 206 controls the frequency f LORX of the LORX output from the LO signal generating unit 201 so that the frequency f beat falls within a predetermined allowable range.
  • the detection of the frequency f beat is performed by digital processing, which makes the duplexer 203, LPF 204, frequency counter 205, and DC blocking element 207 of the first embodiment unnecessary, thereby making it possible to further improve the attenuation of signals due to demultiplexing and to make it possible to miniaturize the receiver.
  • the input port of the duplexer 203 connected to the IF port of the mixer 202 is matched to 50 ⁇ (the impedance of the IF port of the mixer 202), and the output port of the duplexer 203 connected to the ADC 208 via the DC blocking element 207 is matched to 50 ⁇ (the input impedance of the ADC 208). Furthermore, the output port of the duplexer 203 connected to the LPF 204 is set to high impedance (for example, 10 M ⁇ ). This makes it possible in this embodiment to further prevent attenuation of the IF signal caused by signal branching.
  • Fig. 5 is a block diagram showing the configuration of a transmitter of a wireless communication transceiver according to the fifth embodiment of the present invention.
  • the transmitter of this embodiment includes a mixer 400 that mixes an LO signal and an IF signal to generate an RF signal, an antenna 401 that transmits the RF signal, a level adjustment signal generator 402 that generates an LO level adjustment signal for adjusting the level of the LO signal included in the RF signal, and a multiplexer 403 that outputs a signal obtained by adding the output signal of mixer 400 and the LO level adjustment signal to antenna 401.
  • 500 indicates the frequency spectrum of the LO signal
  • 501 indicates the frequency spectrum of the IF signal generated from the transmission baseband signal by a modulator (not shown)
  • 502 indicates the frequency spectrum of the output signal of the mixer 400
  • 503 indicates the frequency spectrum of the LO level adjustment signal
  • 504 indicates the frequency spectrum of the output signal of the combiner 403.
  • the transmitter of this embodiment is used in conjunction with the receiver described in the first to fourth embodiments.
  • the RF signal received by the receiver antenna 200 must contain a LOTX component.
  • an LO level adjustment signal of the same frequency as the LO signal leaking from mixer 400 to the multiplexer 403 side is generated by the level adjustment signal generating unit 402, and by adding the LO level adjustment signal to the output signal of mixer 400, it is possible to mix the LOTX component into the RF signal received by the receiver antenna 200.
  • the strength and phase of the LO level adjustment signal may be set in advance so that the frequency counter 205 of the receiver can detect the frequency f beat of the beat signal, or in the third embodiment, the strength and phase of the LO level adjustment signal may be set in advance so that the frequency detection unit 211 can detect the frequency f beat .
  • the level-adjusted signal generating unit 402 is made up of a variable phase shifter 4020 and a variable attenuator 4021.
  • Variable phase shifter 4020 shifts the phase of a signal that is the same as the LO signal input to mixer 400 and outputs the signal.
  • Variable attenuator 4021 attenuates the output signal of variable phase shifter 4020.
  • the phase shift amount of the variable phase shifter 4020 and the attenuation amount of the variable attenuator 4021 can be set so that the frequency counter 205 in the first embodiment can detect the frequency f beat , or so that the frequency detection unit 211 in the third embodiment can detect the frequency f beat .
  • the control unit 206, frequency offset compensation unit 209, demodulation unit 210, and frequency detection unit 211 described in the first to fourth embodiments can be realized by a DSP or computer equipped with a CPU (Central Processing Unit), a storage device, and an interface, and a program that controls these hardware resources.
  • a DSP or computer equipped with a CPU (Central Processing Unit), a storage device, and an interface, and a program that controls these hardware resources.
  • An example of the configuration of a DSP or computer is shown in Figure 7.
  • the DSP or computer includes a CPU 600, a storage device 601, and an interface device (I/F) 602.
  • the I/F 602 is connected to the LO signal generating unit 201, ADCs 208 and 208a, frequency counter 205, etc.
  • the CPU 600 executes the processes described in the first to fourth embodiments according to the programs stored in the storage device 601.
  • the wireless communication transceiver of the present invention comprises an antenna configured to receive an RF signal sent from a transmitter, an LO signal generating unit configured to generate an LO signal, a mixer configured to mix the RF signal received by the antenna with the LO signal to generate an IF signal, a splitter configured to split the IF signal output from the mixer, a filter configured to filter one of the IF signals split by the splitter and pass a beat signal between the LO signal included in the RF signal and the LO signal output from the LO signal generating unit, a frequency counter configured to detect the frequency of the beat signal, and a control unit configured to control the frequency of the LO signal output from the LO signal generating unit so that the frequency of the beat signal falls within a predetermined tolerance range.
  • the wireless communication transceiver described in Appendix 1 further comprises a DC blocking element configured to block the DC component of the other IF signal split by the splitter and pass the AC component, an AD converter configured to convert the IF signal that has passed through the DC blocking element into a digital signal, and a demodulation unit configured to convert the IF signal obtained by the AD converter into a baseband signal.
  • the wireless communication transceiver of the present invention comprises an antenna configured to receive an RF signal sent from a transmitter, an LO signal generating unit configured to generate an LO signal, a mixer configured to mix the RF signal received by the antenna with the LO signal to generate an IF signal, an AD converter configured to convert the IF signal output from the mixer into a digital signal, a frequency detection unit configured to digitally process the IF signal obtained by the AD converter and detect the frequency of a beat signal between the LO signal included in the RF signal and the LO signal output from the LO signal generating unit, and a control unit configured to control the frequency of the LO signal output from the LO signal generating unit so that the frequency of the beat signal falls within a predetermined tolerance range.
  • the wireless communication transceiver described in Appendix 3 further includes a demodulation unit configured to convert the IF signal obtained by the AD converter into a baseband signal.
  • the wireless communication transceiver described in Appendix 2 is characterized in that the input port of the splitter connected to the IF port of the mixer is matched to 50 ⁇ , the output port of the splitter connected to the AD converter via the DC blocking element is matched to 50 ⁇ , and the output port of the splitter connected to the filter is high impedance.
  • the wireless communication transceiver of the present invention is composed of a transmitter and a receiver, the transmitter having a first antenna configured to transmit an RF signal, a first mixer configured to mix an LO signal and an IF signal to generate an RF signal, a level adjustment signal generating unit configured to generate a level adjustment signal for adjusting the level of the LO signal included in the RF signal output from the first mixer, and a first multiplexer configured to output a signal obtained by adding the output signal of the mixer and the level adjustment signal to the first antenna, and the receiver has a second antenna configured to receive the RF signal sent from the transmitter, an LO signal generating unit configured to generate an LO signal, and a first multiplexer configured to output a signal obtained by adding the output signal of the mixer and the level adjustment signal to the first antenna.
  • the device includes a second mixer configured to mix an RF signal received by an antenna with an LO signal output from the LO signal generating unit to generate an IF signal, a splitter configured to split the IF signal output from the second mixer, a filter configured to filter one of the IF signals split by the splitter and pass a beat signal between the LO signal included in the RF signal received by the second antenna and the LO signal output from the LO signal generating unit, a frequency counter configured to detect the frequency of the beat signal, and a control unit configured to control the frequency of the LO signal output from the LO signal generating unit so that the frequency of the beat signal falls within a predetermined tolerance range.
  • the wireless communication transceiver of the present invention is composed of a transmitter and a receiver, the transmitter includes a first antenna configured to transmit an RF signal, a first mixer configured to mix an LO signal and an IF signal to generate an RF signal, a level adjustment signal generating unit configured to generate a level adjustment signal for adjusting the level of the LO signal included in the RF signal output from the first mixer, and a first multiplexer configured to output a signal obtained by adding the output signal of the mixer and the level adjustment signal to the first antenna, and the receiver includes a second antenna configured to receive the RF signal sent from the transmitter, and an LO signal generating unit configured to generate an LO signal.
  • the device includes a generator, a second mixer configured to mix the RF signal received by the second antenna with the LO signal output from the LO signal generator to generate an IF signal, an AD converter configured to convert the IF signal output from the second mixer into a digital signal, a frequency detector configured to digitally process the IF signal obtained by the AD converter and detect the frequency of a beat signal between the LO signal included in the RF signal received by the second antenna and the LO signal output from the LO signal generator, and a control unit configured to control the frequency of the LO signal output from the LO signal generator so that the frequency of the beat signal falls within a predetermined tolerance range.
  • the present invention can be applied to technology for synchronizing the frequency of LO signals between transmitters and receivers.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Superheterodyne Receivers (AREA)
PCT/JP2022/041676 2022-11-09 2022-11-09 無線通信トランシーバ WO2024100787A1 (ja)

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PCT/JP2022/041676 WO2024100787A1 (ja) 2022-11-09 2022-11-09 無線通信トランシーバ

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JPS5888907A (ja) * 1981-11-20 1983-05-27 Fujitsu Ltd 速信ミキサ
JPS5957534A (ja) * 1982-09-27 1984-04-03 Alps Electric Co Ltd 衛星放送用受信器の屋内ユニツト
JPH04213978A (ja) * 1990-02-15 1992-08-05 Philips Gloeilampenfab:Nv テレビジョン受信部分
JPH0511573U (ja) * 1991-07-17 1993-02-12 日本無線株式会社 ダイレクトコンバージヨン受信機
JPH1093884A (ja) * 1996-06-12 1998-04-10 Samsung Electron Co Ltd ディジタル復調器及び方法
JP2002135153A (ja) * 2000-10-20 2002-05-10 Sharp Corp ミリ波帯無線通信方法及びミリ波帯無線通信装置
JP2007189654A (ja) * 2005-12-16 2007-07-26 Hitachi Kokusai Electric Inc Ａｆｃ回路
WO2020137826A1 (ja) * 2018-12-28 2020-07-02 パナソニックＩｐマネジメント株式会社 ゲート駆動回路およびそれを用いたスイッチング装置

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Publication number Priority date Publication date Assignee Title
JPS5888907A (ja) * 1981-11-20 1983-05-27 Fujitsu Ltd 速信ミキサ
JPS5957534A (ja) * 1982-09-27 1984-04-03 Alps Electric Co Ltd 衛星放送用受信器の屋内ユニツト
JPH04213978A (ja) * 1990-02-15 1992-08-05 Philips Gloeilampenfab:Nv テレビジョン受信部分
JPH0511573U (ja) * 1991-07-17 1993-02-12 日本無線株式会社 ダイレクトコンバージヨン受信機
JPH1093884A (ja) * 1996-06-12 1998-04-10 Samsung Electron Co Ltd ディジタル復調器及び方法
JP2002135153A (ja) * 2000-10-20 2002-05-10 Sharp Corp ミリ波帯無線通信方法及びミリ波帯無線通信装置
JP2007189654A (ja) * 2005-12-16 2007-07-26 Hitachi Kokusai Electric Inc Ａｆｃ回路
WO2020137826A1 (ja) * 2018-12-28 2020-07-02 パナソニックＩｐマネジメント株式会社 ゲート駆動回路およびそれを用いたスイッチング装置

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ANONYMOUS: "High Frequency Measurement Accessories Guide", RS, 17 September 2021 (2021-09-17), XP093171322, Retrieved from the Internet <URL:https://web.archive.org/web/20210917070838/https://jp.rs-online.com/web/generalDisplay.html?id=ideas-and-advice/rf-test-equipment-accessories-guide> *

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