突发通信载波同步解调算法研究与实现

针对突发通信,提出一种初始频偏估计结合相位递推联合估计的结构,实现PSK调试信号的频偏去除与解调.该结构是一种数据辅助的形式,采用相位递推方法,依靠接收到的每个符号信息进行的相位估计,提高了系统误码性能.同时,相位递推结构还降低了系统对于频偏估计器性能的依赖,故采用前向叉积鉴频器进行初始频偏估计,结构简单,易于数字实现.文章最后给出了该结构的实现结构和FPGA资源消耗情况及计算机仿真结果.

Research and Realization of Carrier Synchronization & Demodulationin Burst Digital Transmission

To the burst digital transmission in PSK modulation, we propose a new structure for carrier frequency deviation elimination and signal demodulation, which is the combination of frequency deviation estimation and phase recursion. It is data-aided structure. The phase recursion structure gets phase estimation from every received signal, so advance the error rate performance of this system. Furthermore, phase recursion structure debases the dependence of discriminator precision, so we chose the feedforward cross product discriminator that is easy to implement in digital form. Finally, the computer simulation and FPGA resources consumption were given.