基于PIC的MC-CDMA系统多级型多用户检测技术

摘要

The paper presented the detector for MC -CDMA based on the utilization of a parallel interference cancellation (PIC) to inhibit MAI and effect of near-far, it can take full advantage of all the user's delay amplitude and phase information from spreading sequence to detect jointly for each user, so it improved the overall performance of each user. The performance of the proposed detector is evaluated by means of computer simulations for PIC, in AWGN and multi-path fading channel, and compared to other methods of MUD. We will see that the proposed detector outperforms to the others especially for increase of users.%为了抑制MAI和远近效应以提高系统的性能,采用多级型多用户检测技术,充分利用各个用户的扩频序列时延幅度和相位信息对各用户进行联合检测,利用前级判决的信息构造所有用户的干扰信号,然后从接收信号抵消掉干扰信号,从总体上提高各用户的性能.仿真验证表明,PIC的处理延迟小,且在用户增多的情况下误码率大为降低,但随着级数的增加,计算复杂度增大,故实际应用中一般选三级为宜.