基于周期估计群路QPSK信号全数字化整体解调时大频差校正算法

提出了一种在多路信号数字化解调时将对大频差的直接估计转换成对一个已知序列的周期估计的算法,该算法可以将实际解调中存在的用现有算法较难解决的大频差问题用一个较为简单的算法估计出来并进行校正。其特点是算法简单,计算量较小,特别适用于多路QPSK信号的数字化解调;仿真结果表明该算法是可行的。

The Rectification Algorithm of Wide Frequency Difference Based on the Estimation of Period for the Fully Digitized Demodulationof Group QPSK Signals as a Whole

A method, which turns the direct estimation of wide difference in frequency into the estimation of period of a known sequence for the digitized demodulation of multi-channel signals, is presented. The wide frequency difference problems difficult to solve by available algorithm for actual demodulation can be simply estimated and rectified by the method. So, the difficult problem for the presently digitized demodulation is better solved. The method is simple in algorithm and needs less computation. And the method is especially applicable to the digitized demodulation of multi-channel signals. The simulation results suggest that the algorithm is practicable.