基于维特比算法的GMSK信号非相干解调技术研究  

Noncoherent Demodulation with Viterbi Decoding for GMSK Signals

作　　者：丁兴文 朱智勇[2] 李海涛[2] 

机构地区：[1]北京遥测技术研究所,北京100076 [2]北京跟踪与通信技术研究所,北京100094

出　　处：《遥测遥控》2011年第1期18-21,共4页Journal of Telemetry,Tracking and Command

摘　　要：GMSK体制是深空通信中的新型体制,它具有恒定的包络、优秀的频谱利用率和功率利用率。研究基于维特比算法的GMSK信号非相干解调技术,并在高斯白噪声信道下进行性能仿真。仿真结果表明,该解调算法性能优越,在信噪比Eb/N0=9dB时,GMSK(BT=0.5)信号的误码率性能可达10-4量级,优于传统调频方式约2.4dB。该解调算法已经在某深空测控演示系统中得到了试验验证,性能良好。As a new communication modulation in the deep-space missions,the Gaussian minimum-shift keying(GMSK) modulation is a special continuous-phase modulation(CPM) with constant envelope,good power and bandwidth efficiency.The noncoherent demodulation with Viterbi decoding for GMSK signals is proposed.The bit error rate(BER) performance is assessed for an additive white Gaussian noise channel by the computer simulation.Simulation results indicate that the bit error rate is about 1×10-4 at Eb/No=9dB for GMSK signals with BT=0.5,then,2.4dB gain can be obtained compared with the traditional PCM-FM noncoherent demodulation.This noncoherent demodulation algorithm for GMSK signals has been tested well in a certain deep-space TT&C demo system.

关 键 词：GMSK 调制解调 维特比算法 非相干解调 

分 类 号：TN763[电子电信—电路与系统]