瑞利衰落信道下的异步CDMA多用户接收机

Asynchronous CDMA Multi User Receiver in the Rayleigh Fading Channel

结合了解相关多用户检测的多址去除能力和Ｒａｋｅ接收机的分离多径能力，利用信道的忙闲信息、用户的激活状态和多径强度信息动态减小解相关矩阵的阶，实现低计算复杂性的多用户接收机．结果证明，提出的ＣＤＭＡ接收结构既抑制了远近效应，又有效地对抗了瑞利衰落，性能得到了明显的改善．而且。

The decorrelating multi user detection and the Rake diversity are combined to eliminate multiple access interference and combat Rayleigh fading. By detecting the busy or idle status of channels, the voice active status of users and the multipath signal strength, the order of the decorrelating matrix and the computation complexity of system are reduced dynamically. The results prove that the proposed CDMA receiver can not only resist near far problem, but also combat Rayleigh fading effectively. Reducing complexity doesn't bring out the system performance loss.