Wireless communication transceiver
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- NIPPON TELEGRAPH & TELEPHONE CORP
- Filing Date
- 2022-11-09
- Publication Date
- 2026-06-09
AI Technical Summary
【0011】 本発明によれば、LO信号発生部と分波器とフィルタと周波数カウンタと制御部とを設けることにより、送信機と受信機間のRF帯LO信号の周波数オフセットを補償することができ、信号の減衰と雑音指数の悪化とを防ぐことができる。また、本発明では、RF帯で動作する高精度な搬送波再生回路や遅延器を追加する必要がなくなる。
Smart Images
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Abstract
Claims
1. A transmitter and receiver used in pairs, The aforementioned transmitter is A first antenna configured to transmit an RF signal, A first mixer configured to generate an RF signal by mixing the LO signal and the IF signal, A level adjustment signal generation unit is 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, The system includes a first multiplexer configured to output to the first antenna a signal obtained by adding the output signal of the first mixer and the level adjustment signal, The aforementioned receiver is A second antenna configured to receive the RF signal transmitted from the aforementioned transmitter, A LO signal generation unit configured to generate an LO signal, A second mixer is configured to generate an IF signal by mixing the RF signal received by the second antenna with the LO signal output from the LO signal generation unit, A demultiplexer configured to demultiplex the IF signal output from the second mixer, A filter configured to filter one of the IF signals separated by the aforementioned demultiplexer, and to pass through the 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, A frequency counter configured to detect the frequency of the beat signal, The system includes a control unit configured to control the frequency of the LO signal output from the LO signal generation unit so that the frequency of the beat signal falls within a predetermined allowable range, A wireless communication transceiver characterized in that the level adjustment signal is preset to an intensity and phase such that the frequency counter can detect the frequency of the beat signal, and the level adjustment signal is added to the output signal of the first mixer so that a component of the frequency of the LO signal is mixed into the RF signal received by the second antenna.
2. A transmitter and receiver used in pairs, The aforementioned transmitter is A first antenna configured to transmit an RF signal, A first mixer configured to generate an RF signal by mixing the LO signal and the IF signal, A level adjustment signal generation unit is 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, The system includes a first multiplexer configured to output to the first antenna a signal obtained by adding the output signal of the first mixer and the level adjustment signal, The aforementioned receiver is A second antenna configured to receive the RF signal transmitted from the aforementioned transmitter, A LO signal generation unit configured to generate an LO signal, A second mixer is configured to generate an IF signal by mixing the RF signal received by the second antenna with the LO signal output from the LO signal generation unit, An AD converter configured to convert the IF signal output from the second mixer into a digital signal, A frequency detection unit is configured to digitally process the IF signal obtained by the AD converter and detect the frequency of the 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. The system includes a control unit configured to control the frequency of the LO signal output from the LO signal generation unit so that the frequency of the beat signal falls within a predetermined allowable range, A wireless communication transceiver characterized in that the level adjustment signal is set in advance to an intensity and phase such that the frequency detection unit can detect the frequency of the beat signal, and the level adjustment signal is added to the output signal of the first mixer so that a component of the frequency of the LO signal is mixed into the RF signal received by the second antenna.