Clock recovery method and apparatus in RF far-end module

Abstract

The invention relates to a method for returning the clock in radio remote module and relative device. Wherein, according to the data that the radio remote module RRU receives from the base station, obtaining the clock signal; using said clock signal as the reference clock of soft phase-locked loop to be input the soft phase-locked loop; using the time clock of soft phase-locked loop, that output according to the soft phase-locked preset algorithm and its reference clock, as the reference clock of hard phase-locked loop; using the clock signal output by hard phase-locked loop, according to its reference clock and the clock signal output from soft hard phase-locked loop as the clock signal of RRU. The invention can make the phase noise character of clock signal of radio part in the RRU meet the demand of clock, and make the clock signal of RRU high-speed data interface meet the demand of clock accuracy and RRU cascade, to make the clock signal of RRU meet the demands of clock vibration and clock synchronization, to confirm the data transmission between the RRU and the high-speed interface of base station.

Description

technical field [0001] The invention relates to the technical field of network communication, in particular to a clock recovery method and device in a radio frequency remote module. Background technique [0002] In the mobile cellular communication system, the macro base station and the micro base station can adopt the remote radio technology to realize flexible networking. Optical fiber communication is used between the micro base station and the macro base station. The micro base station does not include the baseband processing part, and mainly realizes the functions of the intermediate frequency and radio frequency, and the function of the baseband part is realized in the macro base station. Such a networking method not only utilizes the powerful baseband processing capability of the macro base station, but also utilizes the characteristics of flexible networking and wide coverage of the micro base station. [0003] The aforementioned micro base station is generally call...

AI Technical Summary

Problems solved by technology

[0007] 2. Clock jitter and clock synchronization requirements

[0010] Since the loop bandwidth of the hard phase-locked loop cannot be set too narrow, the noise introduced by the upper-level clock through transmission cannot be filtered out, which deteriorates the near-end phase noise of the RRU clock signal, thereby affecting the clock index of the RRU clock signal

Especially in the case of RRU cascading, the near-end phase noise deterioration of the RRU clock signal will accumulate, so that the clock signal of the subsequent RRU cannot meet the clock index requirements

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