摘要
QPSK信号相干解调时的载波同步是设计QPSK全数字接收机的一个技术难点,它有两个方面,一是载波频偏估计,二是载波相位估计。本文对载波频偏估计算法进行研究,介绍了一种全数字化载波频偏估计器算法,对它进行数学分析,提出了改进的简化算法,通过计算机仿真对两种算法的性能做了比较。仿真结果表明,简化算法是可行的,并具有相对简单、更易于用DSP器件实现的优点,适合于工程实现。
Carrier synchronization is a key technology of all digital receiver for QPSK signal coherent demodulation. It consists of two aspects： the frequency difference estimation and the phase difference estimation. The former aspect is studied in this paper. An algorithm to estimate frequency difference for QPSK signal in all digital receiver is presented. Then, a reduced complexity improvement is proposed after analyzing this algorithm mathematically. The performances of both algorithms are compared through computer simulation finally. The simulation results show that the simplified algorithm is usable, relatively simple and more suitable for the realization by DSP. It can be applied to the practical communication systems.
出处
《电路与系统学报》
CSCD
北大核心
2008年第4期112-115,共4页
Journal of Circuits and Systems
关键词
全数字接收机
载波同步
频偏估计
all digital receiver
carrier synchronization
frequency difference estimation
