摘要
针对高斯滤波器与码元间隔乘积极小(BTb≤1/6)的最小高斯频移键控(GMSK)信号解调,研究了基于1比特相位差分、2比特相位差分和基于维特比(Viterbi)检测算法的相位差分的解调方法,给出了不同了BTb下维特比检测的状态转移计算方法,有效的克服了极小BTb参数引入的码间串扰对解调误比特率的影响。仿真结果表明,在BTb=0.15的情况下,采用基于2比特相位差分的维特比检测(截断长度为4Tb)是较好的解调方案。
Differential phase detection（DPD） and Viterbi detection based algorithm（DPD-VA） to demodulate GMSK signals with BTb≤1/6 is studied,the state transfer calculating method of Viterbi detection for different BTb is presented,which could overcome the severe intersymbol interference（ISI） of GMSK signals with extremely small BTb.Simulation results show that the 2-bit DPD based on Viterbi detection with punctured length of 4Tb is a fairly good solution for demodulating GMSK signal with BTb=0.15.
出处
《通信技术》
2012年第2期65-67,70,共4页
Communications Technology
