异步DS-CDMA系统盲自适应多用户检测

Blind adaptive multiuser detection for asynchronous DS-CDMA system

目的提出适用于多径衰落信道中的异步DS-CDMA盲自适应多用户检测算法。方法通过研究多径信号码空间和数据矢量空间,采用噪声子空间技术进行异步DS-CDMA系统期望信号矢量估计,同时利用了多径传播和接收机同步失调的特性。结果使用一种修改的ULV更新算法进行噪声子空间跟踪。结论仿真结果验证了本文算法的有效性。

Aim To propose two blind adaptive muhiuser detection for asynchronous DS-CDMA in multipath fading channel. Methods By investigating the code space of the multipath signals and the data vector space, the noisesubspace-based approach is used to estimate the desired signal vector for asynchronous DS-CDMA. The method exploits not only the characteristics of muhipath propagation but also the characteristics of timing-offsets which may occur in the receiver. Results Furthermore, a modified ULV updating algorithm is applied to performing noise subspace tracking. Conclusion Simulation results are listed to show the effectiveness of the proposed algorithms.