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针对突发通信系统中定时与载波联合同步存在运算复杂度高的问题,提出了一种基于导频辅助的同步算法.首先针对基于匹配滤波器多项实现形式的定时环路,讨论了滤波器的实现形式及各支路采样时钟的控制方法;接着按照最优导频放置方式设计了一种基于相关函数和的频率估计器,该频率估计器运算简单并且其估计精度可接近CRB(Cramer-RaoBound)界;最后用仿真验证了所提出的接收机性能.结果表明新算法采用较小的导频数目就可以实现理想同步,同时复杂度低,适合于工程实现.
Aiming at the problem of high computational complexity of joint timing and carrier synchronization in a burst communication system, a pilot-assisted synchronization algorithm is proposed.Firstly, aiming at the timing loop based on the multiple implementation of matched filter, And the control method of each branch sampling clock. Then a frequency estimator based on the correlation function sum is designed according to the optimal pilot placement method. The frequency estimator is easy to operate and its estimation accuracy can be close to CRB (Cramer- RaoBound) .Finally, the performance of the proposed receiver is verified by simulation.The results show that the new algorithm can realize ideal synchronization with a small number of pilots and low complexity, which is suitable for engineering implementation.