分集接收混合遗传算法多用户检测器在异步CDMA移动通信中的应用研究

The application investigation of hybrid genetic algorithm for multi-user detection with diversity reception in asynchronous CDMA mobile communications

本文研究了将混合遗传算法应用于码分多址扩频通信的多用户检测中,从而消除多址接入干扰的方法。本文先给出了在异步瑞利衰落信道下解调扩频信号的分集接收混合遗传算法多用户检测器的原理框图,然后分析了用混合遗传算法进行多用户检测的理论依据和实际性能。仿真结果表明无论是抗多址干扰还是抑制远近效应,分集接收混合遗传算法多用户检测器都明显优于传统接收机,其性能接近分集接收最佳多用户检测器。

Study is conducted on the application of hybrid genetic algorithm (HGA) to the multi-user detection with DS-CDMA spread spectrum communications to mitigate the effect of multiple access interference. The schematic diagram of a multi-user detector employing hybrid genetic algorithm, with diversity reception, is put forward for the demodulation of spread spectrum signals in asynchronous Raleigh fading channels. An analysis is then given to the theoretical basis and practical performance of multi-user detection using HGA. The emulation results have shown that HGA multi-user detector with diversity reception is obviously superior to the conventional receiver in terms of both the resistance on the multiple access interference and the mitigation of near-far effects. Its performance is close to the optimum multi-user detector with diversity reception.