MSK信号的最大似然非相干检测算法研究  

The Research of MSK Maximum Likelihood Noncoherent Detection Algorithm

作　　者：周世阳 王赏[2] 程郁凡[1] 王莉[3] 

机构地区：[1]电子科技大学通信抗干扰技术国家级重点实验室 [2]航天恒星科技有限公司 [3]中国人民解放军95028部队

出　　处：《信号处理》2016年第7期866-871,共6页Journal of Signal Processing

基　　金：国家级重点实验室基金项目(150C02006)

摘　　要：针对最小频移键控(MSK)信号,本文研究了一种性能优异的低复杂度最大似然非相干检测(MLNCD)接收模型,通过利用有限的几个符号构成的观测序列检测中间符号解调信息。本文给出了MLNCD模型的判决表达式,并推导了基于MLNCD算法的MSK信号软解调简化表达式,降低了实现复杂度。本文还仿真分析了采用MLNCD算法的无编码MSK系统和有编码MSK系统的误码率(BER)性能,结果表明MLNCD算法比传统MSK非相干解调算法具有显著的BER性能优势,与MSK相干解调性能接近,而且软信息的简化几乎没有造成系统性能损失。In this paper,we study a low-complexity receiving model with good performance based on maximum likelihood noncoherent detection（ MLNCD） for Minimum Shift Key（ MSK） signal. In the receiving model,middle symbol can be detected by using observed sequence constituted of few symbols. Besides,decision expressions are proposed based on MLNCD model and simplified expressions of MSK demodulation soft information are derived based on MLNCD algorithm,which reduce implement complexity. Furthermore,bit error rate（ BER） performance of uncoded MSK system and coded MSK system using MLNCD algorithm are analyzed by simulation. Results show that the BER performance of MLNCD algorithm is much better than that of conventional MSK noncoherent demodulation algorithm,and close to MSK coherent demodulation algorithm performance. In addition,the simplification of soft information causes nearly no loss to system performance.

关 键 词：最小频移键控 最大似然 非相干检测 软信息 

分 类 号：TN911.7[电子电信—通信与信息系统]