Parallel-connected multi-channel RRF (radio-frequency remote unit) device and local oscillator signal generating method thereof

Abstract

The invention provides a parallel-connected multi-channel RRF (radio-frequency remote unit) device. The parallel-connected multi-channel RRF (radio-frequency remote unit) device comprises an FPGA (field programmable gate array) transceiver, a first-level phase-locked loop, a second-level phase-locked loop, a distributor and a frequency synthesizer. The FPGA transceiver is used for providing reference signals required by the first-level phase-locked loop. The first-level phase-locked loop is used for providing reference signals required by the second-level phase-locked loop. The second-level phase-locked loop and the distributor are used for providing reference signals required by the frequency synthesizer. The parallel-connected multi-channel RRF device is characterized in that the second-level phase-locked loop is further provided with a two-way port transmitting reference signals to a second-level phase-locked loop of the other parallel-connected multi-channel RRF device. The invention further provides an local oscillator signal generating method of the parallel-connected multi-channel RRF (radio-frequency remote unit) device.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a parallel multi-channel radio frequency remote unit device and a local oscillator signal generation method thereof. Background technique [0002] The RRU (radio frequency remote unit) circuit of a wireless communication system generally includes a digital circuit part and a frequency synthesizer. Usually, the digital circuit part provides a reference signal for the frequency synthesizer first. The frequency synthesizer is essentially a phase-locked loop, and then the The frequency synthesizer locks the frequency of the VCO (Voltage Controlled Oscillator) and the frequency of the reference signal to obtain a signal with the same frequency accuracy as the reference signal, which is amplified and used as the local oscillator signal of the RRU circuit . Among them, the process of the digital circuit part providing the reference signal for the frequency synthesizer is generally...

AI Technical Summary

Problems solved by technology

First of all, since the transmitted local oscillator is a radio frequency signal, the selection of connectors, the use of PCB boards, and the way of wiring all need to be designed in accordance with the radio frequency method, which is technically difficult and costly.

Secondly, two multi-channel RRU devices cannot be exactly the same. One multi-channel RRU device must output the local oscillator, and the other multi-channel RRU device must input the local oscillator. Therefore, these two multi-channel RRU devices need to be treated as two products. , it will increase the difficulty of control in production and product maintenance

Thirdly, because the two multi-channel RRU devices are similar in shape but different in function, errors are prone to occur during on-site installation, resulting in increased on-site maintenance costs

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