一种新的适用于多径信道的基于LMK准则的盲自适应多用户检测算法及其收敛性分析

A Novel Blind Multiuser Detection Based on LMK Criterion for Synchronous DS/CDMA System over Multipath Fading Channels andIts Convergence Analysis

基于最小平均峰度(Least Mean Kurtosis,LMK)准则,该文提出了一种适用于同步直扩码分多址(DS/CDMA)系统多径慢衰落信道中的线性盲自适应多用户检测算法。这种算法基于高阶统计量(High Order Statistics,HOS)特性,算法复杂度相对较低。文中分析了算法在多径信道中无噪声情况下的收敛特性,指出在这种情况下,算法具有全局最小点,此时算法满足解相关条件。仿真结果表明,文中给出的检测器具有较强的多址干扰抑制性能。

In this paper, a new linear blind adaptive multiuser detection based on LMK criterion is proposed for synchronous DS/CDMA system over multipath fading channels. The new algorithm bases on HOS(High Order Statistics) and reduces complexity remarkably. The convergence of this algorithm is analyzed over multipath fading channel in the noise-free environment. In this case, the algorithm has global minimum point. On global minimum point, the algorithm satisfies decorrelating condition and can completely remove multiple-access interference. The simulation results show that the algorithm has good performance.