直接序列扩频码分多址系统多址干扰的最大似然联合估计

Estimate of Signal Parameter for Multiple Access Interferencein DSCDMASystems

结合信号参数的估计，提出一种新的多址干扰联合估计算法———最大似然估计法．该算法复杂度不高，估计误差较小，对大功率用户产生的多址干扰的估计尤为准确，因而能有效地消除其对小功率用户产生的多址干扰，使总体误码率下降．理论分析和仿真结果均表明，这种算法的性能优于传统的单用户检测器，并有更好的抗“远近效应”

The approach of signal parameter is employed to develop an algorithm for the combined multiple accessinterference estimate,i.e.,the maximum likelihood estimate .Itisequally effectivefor users with strong and weak power.The overall bit error rate isthen decreased . Analysis and simula tion show thatthe presentapproach outperformsthe conventionalsingle user detector method and can enhance the capacity forthe near and farresistance.