用于DS/CDMA系统多用户检测的变步长符号算法

提出了一种新颖的变步长符号算法用于DS/CDMA系统的多用户检测。这种算法对盲平均符号算法的步长又一次采用二次最小均方误差算法,克服了盲平均符号算法受步长影响的缺点,并利用符号算法计算复杂度低的特点,加快了算法的收敛速度。仿真表明,这种算法能够自动迅速地适应环境的变化并且不受初始步长和学习率的影响,在性能上优于与其类似的自适应接收机。

A Step -size Sign Algorithm for DS -CDMA Multiuser Detection

A new adaptive blind adaptive step -s ize averaging blind sign algorithm(ASSS)for multiuser detection in direct -sequence code division multiple acc ess receivers is presented in this paper.It combines the sign -regressor algorithm and the concept of variable step -size,uses a second LM S algorithm for the step size of blind averaging sign -regressor algorith m.The new algorithm overcomes the problems of the effect of fixed step -size to the signal -int erference rate and reduces the compl exity of calculation.Simulations indicate that this prop osed method is superior over the simi lar adaptive receivers and its robustness to different settings of the initial step -size and learning rate.