Approzimate ML Deffection Based on MMSE for MIMO Systems

摘要：

We derive two types of approximate maximum likelihood (ML) deffection based on minimum mean squared error (MMSE), MMSE-CML (conditional ML) deffection and MMSE-CLML (conditional local ML) deffection, for MIMO communication system. A simple reliability judge rule to judge the estimate of the transmit symbols is also given. For the proposed MMSE-CML deffection, received signals are first sent into MMSE deffector to do linear equalization, then the estimate of transmit signals is judged in reliability judge module; If the estimate is judged to be reliable, we take the estimate as the final result; if not, the received signals are then sent into conditional ML (CML) deffector to get the final result; Unlike conventional ML deffector, the CML deffector performs a tree search till the estimate satisfies the reliability judge rule or an entire tree search has been done. For the proposed MMSE-CLML deffection, we use CLML search instead of CML search in MMSE-CML, which searches in the neighborhood of the output provided by the MMSE deffector. Simulation results show that the MMSE-CML deffector achieves near the same performance as optimal CML deffector at reduced complexity, and MMSE-CLML deffector achieves suboptimal performance at remarkably reduced complexity.

作者: Fan Wang Yong Xiong Xiumei Yang

作者单位: The Electromagnetics Academy at Zhejiang University, Zhejiang University, China Shanghai Research Center for Wireless Communications, China

会议类型: 国际会议

会议名称: Progress in Electromagnetics Research Symposium 2007(2007年电磁学研究新进展学术研讨会)(PIERS 2007)

会议地点: 北京

会议语种:英文

页码: 879-884

在线出版日期: 2007-03-26（万方平台首次上网日期，不代表论文的发表时间）