基于多中继散射组网的时钟恢复方案

Clock Recovery Scheme Based on Tropospheric Multi-relay Scattering Network

摘要:

由于目前存在的准同步时钟恢复方案不能够满足多中继散射通信的抖动指标，所以提出一种在多中继的散射信道中的低抖动时钟恢复方案。该方案由一个数字锁相环和一个模拟锁相环共同实现，即双环提取方案。数字锁相环主要是利用定时误差恢复出一个存在抖动的时钟，再由模拟锁相环对恢复出的抖动时钟进一步提纯。传统时钟恢复方案的误差为输入码率下的一比特时长，该新型方案将提高误差精度，从而大大降低在多中继传输中的时钟抖动，这将是散射通信组网的关键技术。

Abstract:

Since the existing quasi-synchronous clock recovery scheme can not satisfy the jitter indicator of multi-relay tropospheric scatter communication, a low-jitter clock recovery scheme in a multi-relay tropospheric scatter channel is proposed. The scheme is implemented by a digital phase-locked loop and an analog phase-locked loop, that is, a dual-loop extraction scheme. The digital phase-locked loop mainly recovers a clock with jitter by using the timing error, and then further refines the recovered jitter clock by the analog phase-locked loop. The error of the traditional clock recovery scheme is one bit duration under the input code rate. The new scheme improved the error precision, thereby greatly reducing the clock jitter in the multi-relay transmission, which will be the key technology of the tropospheric scatter communication network.