DS-CDMA系统下行盲多用户接收机

Blind Multiuser Receiver for The DS-CDMA Downlink Signal

本文研究多径频率选择性衰落信道下,DS-CDMA系统下行盲多用户检测技术,提出了一种新的基于恒模算法的检测方法。利用下行信号的特征构造约束条件并采用投影梯度法求解优化问题,本文方法克服了常规恒模算法无法保证收敛到期望用户的缺点。仿真结果验证了本文方法具有良好的检测性能,可以在克服信道衰落的同时抑制多址干扰。

The problem for blind multi-user to detect the DS-CDMA downlink signals in multi-path frequency selective fading environment is considered. A novel detecting method based on constant modulus algorithm is proposed. This is to exploit the characteristics of downlink signals to obtain constraint condition and solve the optimization problem by iterative projection approach. Using the proposed method, it is possible to overcome the shortcoming of conventional CDMA that can not guarantee to converge to a specific user. Simulation results demonstrate that the proposed method offers higher detecting performance and is capable of combating both channel fading and multiple-access interference.