一种基于改进的DSE-CMA算法的盲多用户检测

提出了一种基于改进抖动符号误差恒模算法（Modified Dithered Sign—Error Constant Modulus Algorithm,MDSE—CMA）的盲多用户检测算法。抖动符号误差恒模算法（Dithered Sign—Error Constant Modulus Algorithm,DSE—CMA）稳态性能好，但其过量的均方误差使得收敛速度较慢。MDSE—CMA算法通过引入符合正弦概率密度分布的抖动信号来减少均方误差。基于该算法的多用户检测方法与DSE—CMA算法相比，收敛速度加快。仿真证明，提出的方法在码分多址（Code Division Multiple Aceess，CDMA）异步多径信道下可有效地抑制多址干扰和克服多径衰落。

Blind Multiuser Detector Based on Modified DSE-CMA

Based on modified dithered sign-error constant modulus algorithm(MDSE-CMA),a multi-user detection algorithm is proposed.The characteristic of steady state of the dithered sign-error constant modulus algorithm(DSE-CMA) is good,but the slow convergence is resulted from its excess mean-squared error(MSE).A dithering signal with sinusoidal probability density is introduced in MDSE-CMA to reduce the MSE.The multi-user detection based on MDSE-CMA can achieve faster convergence than DSE-CMA.Simulation results show that it can suppress multi-address interference and overcome multi-path fading effectively in code division multiple access(CDMA) and asynchronous multi-path channels.