基于遗传搜索和有限反馈的酉阵设计  

Unitary Matrix Design Based on Genetic Search and Limited Feedback

作　　者：何仪周 程智慧 王军生[2] 雷向勇 练岚香[2] 

机构地区：[1]北京1481信箱,北京102442 [2]北京理工大学,北京100081

出　　处：《通信技术》2010年第3期7-9,共3页Communications Technology

摘　　要：在MIMO系统中,酉阵主要应用于差分空时调制(DUSTM)及有限反馈预编码两个方面。DUSTM主要应用于无法获得信道状态参数(CSI)情况下,而有限反馈预编码则应用于完全或部分可获得CSI情况下。文中提出了一种基于实型"频率"系数的遗传搜索方法,即使在系统维数很大的情况下,运用该方法获得酉阵设计的码字性能优于由整型"频率"系数穷举搜索而获得的码字。In MIMO communication systems exist two applications that use unitary matrix：differential space-time modulation（DUSTM） and limited feedback precoding.DUSTM is used when the channel state information（CSI） is not available for both transmitter and receiver,while limited feedback precoding is used when complete or partial CSI is available for both sides.In this paper,a genetic algorithm to find the Unitary matrix over ＂real frequency＂ parameters is proposed.This approach could provide better codes than the codes extracted from exhaustive search over ＂integer frequency＂ parameters.The code extraction is fast even when the system dimensions are large.

关 键 词：遗传搜索 差分空时调制(DSTM) 有限反馈预编码 酉阵 

分 类 号：TN91[电子电信—通信与信息系统]