小BT突发GMSK信号定时恢复算法及性能分析

Performance analysis and simulation of timing recovery for burst GMSK signals with small BT

摘要:

针对小带宽周期积(BT)的突发高斯频移键控(GMSK)信号解调中的定时问题，分析研究了2种非数据辅助定时估计方法，通过Matlab仿真比较了它们的性能和影响因素。仿真结果表明，在BT值较小的情况下，联合相位定时恢复算法能达到较好的定时性能，在EbN0≥12 dB的条件下，定时方差小于1×10ˉ3；而联合频偏定时估计算法在频偏大于1%的情况下性能基本不受影响，在工程实现中可根据应用要求进行算法选择。

Abstract:

This paper is focused on two Non-Data Aided(NDA) timing recovery algorithms for burst Gaussian Minimum Shift Keying(GMSK) demodulation with small Bandwidth Time(BT). Performance of each algorithm is studied by Matlab simulation. It is demonstrated that the joint phase and timing synchronization exhibits great performance under small BT values，and its timing Minimum Square Errors(MSE) can be lower than 1×10ˉ3 under EbN0≥12 dB；while the performance of joint frequency and timing algorithm is outstanding when the frequency bias is above 1%. The selection of algorithm to be used depends on the application requirements in practical engineering.