在CDMA系统中实现多用户检测的障碍函数下降方向法

BARRIER FUNCTION DESCENT DIRECTION METHOD FOR CDMA MULTI-USER DETECTION

该文提出了在码分多址(CDMA)系统上实现多用户检测的一种基于障碍函数下降方向的方法(BMD)。与传统方法以及神经网络优化算法相比较,作者提出的方法是利用障碍函数而得到的一个新的下降方向而不是梯度下降方向。计算机模拟表明:这种方法总能找到全局最优解,并具有抑制多址干扰和噪声干扰,对“远-近”问题不敏感等特点。这为实现码分多址系统上的最佳多用户检测提供了一条新的途径。

In this paper, A barrier function descent direction method for implementing CDMA multi-user detection (BMD) is proposed. As compared to conventional detectors and neural network optimal algorithms, the method derives a new descent direction from the barrier function other than the gradient direction. Numerical results show that the method is always able to find the global minimization point. It has many advantages featuring near-far effect resistance, able to suppressing multiple access interference and channel noise, etc. The method paves a new way for realizing optimal multi-user detection in CDMA system.