论文部分内容阅读
如何抑制多址干扰 ,同时降低实现复杂度 ,是研究MC- DS/ CDMA系统的关键之一。论文在已有的联合最小均方误差 (MMSE)检测器的基础上 ,提出了两种基于单载波的MMSE检测器结构 ,即 MMSE- MRC结构和 MMSE- MMSE结构 ,比较了几种接收机的性能。仿真表明 :MMSE- MRC和 MMSE- EGC的性能与传统的解扩— MRC结构相近 ,不能有效地抑制多址干扰。当载波数较小或较大时 ,MMSE-MMSE的性能接近联合 MMSE检测器 ,而计算量只有O(N3/ M2 +M3) ,远小于联合 MMSE检测器的计算量 ,有利于工程实现。
How to suppress multiple access interference and reduce the complexity of implementation is one of the keys to study MC-DS / CDMA system. Based on the existing Joint Minimum Mean Square Error (MMSE) detector, this paper proposes two MMSE-MMSC detector structures based on single-carrier, that is MMSE-MRC structure and MMSE-MMSE structure, and compares the performance of several receivers performance. The simulation results show that the performance of MMSE-MRC and MMSE-EGC is similar to the traditional despreading-MRC structure, which can not effectively suppress multiple access interference. When the number of carriers is small or large, the performance of MMSE-MMSE is close to that of joint MMSE detector, and the computational cost is only O (N3 / M2 + M3), which is much smaller than that of joint MMSE detector.