多重信号广义似然接收机的设计及性能分析

Design and performance analysis of generalized likelihood ratio receiver for multiple signals

提出并设计了一类通用的多重信号广义似然接收机。设计时只要求各重信号中高斯噪声是独立和零均值的,而允许是有色的或者非平稳的。推导结果表明,针对各重未知信号的最好情况(高信噪比,且各重信号幅度相等)、最不利情况(信噪比很低,且各重信号幅度独立)和适中情况(信噪比不太高也不太低,且各重信号幅度独立),所设计的接收机结构都是一致的,只是某些具体参数和模块不同。本文还针对此接收机给出了性能分析的一个比较通用的方法。仿真结果与推导的理论性能相当吻合。

A kind of generalized likelihood ratio（GLR）receiver is proposed for multiple signals detection. Based on a very loose assumption that Gaussian noise is of independent and zero mean, the receiver is designed for three types of signals characterized by their independent property and the signal-to-noise ratio （SNR）, that is, for the best case （i. e. high SNR and equal amplitude signals）, for the worst case （low SNR with independent signals）, and for the moderate case （moderate SNR with independent signals）, respectively. For the three cases, the receiver bears the same structure except some parameters and modules. A generalized analysis method for evaluating the performance of this kind receiver is also given. The simulation results coincide with the theoretic performance very well.