Performance analysis of optimal channel estimation and multiuser detection in a randomly-spread CDMA channel
Performance analysis of optimal channel estimation and multiuser detection in a randomly-spread CDMA channel
复制标题
DOI：
10.1007/s11424-010-9278-z
复制
发表时间：
2010-02
影响因子：
2.1
通讯作者：
K. Takeuchi;Mikko Vehkaperä;Toshiyuki TANAKA;R. Müller
中科院分区：
文献类型：
--
作者：
K. Takeuchi;Mikko Vehkaperä;Toshiyuki TANAKA;R. Müller
在随机扩频和大系统限制的假设下，利用统计力学中的副本方法，分析了块衰落码分多址（CDMA）信道中的最优信道估计和多用户检测（MUD）性能。研究发现，Evans和Tse在2000年提出的线性最小均方误差（LMMSE）多用户检测算法的渐近频谱效率与最优多用户检测算法在小系统负载下的渐近频谱效率没有区别。我们的结果意味着，即使花费比LMMSE MUD更多的计算成本，MUD的性能也几乎没有改善，即，在上述条件下，最多是用户数量的立方。
This paper analyzes performance of optimal channel estimation and multiuser detection (MUD) in a block-fading code-division multiple-access (CDMA) channel on the assumptions of random spreading and large-system limit, by using the replica method developed in statistical mechanics. The authors find that the asymptotic spectral efficiency of the linear minimum mean-squared error (LMMSE) MUD which was proposed and analyzed by Evans and Tse in 2000 is indistinguishable from that of the optimal MUD for small system loads. Our results imply that performance of MUD scarcely improves even if one spends more computational cost than that of the LMMSE MUD, i.e., at most the cube of the number of users, on the above-described conditions.