单通道GMSK混合信号线性联合检测算法  

A joint detection algorithm of single channel GMSK mixing signals with linear complexity

作　　者：胡昌海[1] 朱义君[1] 杨育红[1] 

机构地区：[1]信息工程大学信息系统工程学院,河南郑州450002

出　　处：《太赫兹科学与电子信息学报》2014年第2期266-271,共6页Journal of Terahertz Science and Electronic Information Technology

基　　金：国家重大科技专项资助项目(2009ZX03003-005-01)

摘　　要：对单通道同频同调制突发高斯最小频移键控(GMSK)混合信号联合检测问题进行了研究。基于混合信号的时延差异性和符号间干扰(ISI)特性,提出了一种分支联合判决反馈检测算法。检测时将每条支路当作单个GMSK信号,并通过其他支路的信息反馈来优化检测性能。理论和仿真表明,与最大似然检测指数复杂度相比,通过分支判决反馈,其复杂度降为线性,检测性能比无判决反馈时的检测带来了约2 dB的增益,并在高信噪比下接近逐幸存路径处理(PSP)算法。仿真分析了时延对分支联合反馈算法的影响:当混合信号的幅度相同,时延为码元整数倍时,混合信号不具有可检测性,并进行了理论推导;当混合信号可分时,相对时延越大,分离性能越好。The single channel blind separation of burst Gaussian Minimum Shift Keying(GMSK) mixing signals with the same modulating parameters is studied. Based on the delay variation of mixing GMSK signals and their Inter Symbol Interference(ISI) features, a multi-branch joint decision-feedback detection algorithm is proposed. The mixing signals are taken as single signal at each branch,and the decision-feedback information is adopted to optimize the detection performance. The theory and simulation show that, the complexity of the proposed algorithm is reduced to linearity by through multi-branch decision-feedback when compared with the exponential complexity of joint maximum likelihood sequence estimation; a gain of about 2 dB can be obtained in the detection compared to that in the case of no decision-feedback; and the performance is close to that of Per-Survivor Processing(PSP) Algorithm in high Eb/N0 region. The influence of time delay on the proposed algorithm is discussed. When the amplitudes are same and the relative time delay is the integral multiple of the symbol period,the mixing signals cannot be detected. Relative theoretical derivation is performed as well. Whereas the mixing signals can be detected,the larger the relative time delay, the better the performance.

关 键 词：GMSK突发混合信号 单通道 联合检测 相对时延 

分 类 号：TN911.23[电子电信—通信与信息系统]