多载波CDMA在深度瑞利慢衰落环境下的实用均衡策略

An Applied Equalization Scheme for Multi-Carrier CDMA Systems in a Slow Deep Rayleigh Fading Channel

多载波CDMA(MC-CDMA)系统中信号经过频率选择性衰落的信道时,接收端需要采取一定的均衡技巧。在多用户的环境下,恢复正交的均衡措施能得到较好的效果。本文提出的带反馈的能量受控均衡由恢复正交均衡发展而来,能较好地恢复扩频码的正交性且避免信道深度衰落导致的噪声扩大的影响。并且,加上自适应的策略,能使系统达到很低的误码率水平,使系统的性能提高超过2dB。

In a Multi -Carrier CDMA system, to receive signals through frequency selective channel, the receiver must take advantage of equalization. In multi - user environment, orthogonality restore equalization will be more eficient. Energy controlled equalization with feedback, proposed in this paper, which is developed from it, can well restore the orthogonality of spreading codes and avoid excessive noise caused by deep fading of channel. And with adaptive scheme, the system will have a very low BER, and the performance can be improved more than 2dB.