MIMO系统中码速率约束下的联合收发优化  

Joint Transmit and Receive Optimization with Rate Constraint in MIMO System

作　　者：赵绍刚[1] 喻欣[1] 吴伟陵[1] 

机构地区：[1]北京邮电大学信息工程学院,北京100876

出　　处：《北京邮电大学学报》2005年第6期17-21,共5页Journal of Beijing University of Posts and Telecommunications

基　　金：国家自然科学基金项目(60172051);2004教育部重点项目(104042)

摘　　要：从实际的通信要求出发,在给定发射功率和传输码速率条件约束下,对多入多出(MIMO)空间复用结构进行优化,提出了1种新的MIMO系统联合收发算法,从而使得整个系统误码率最小.该优化方法通过优化后的收发滤波器将整个MIMO系统分解为多个独立并行子信道,然后将简化后的Fischer加载算法应用到该MIMO空间复用系统中,进而求出在这些子信道上进行最优功率分配的算法.从而实现码速率约束下的联合收发优化.分析和仿真结果一致表明,在同一MIMO空间复用系统中,在相同的信噪比情况下,码速率越低系统的误码性能就越好.而当码速率相同时,收发天线数目越多系统的性能就越好.A new algorithm of joint transmit and receive optimization based on the practical need of the communication system was put forward, The new optimization algorithm could optimize the MIMO spatial multiplexing system to minimize the symbol error rate with the constraint of a fixed transmit power and data rate. The whole MIMO spatial multiplexing system could be decomposed into several independent parallel subchannels by the optimized transmit and receive filter, And modified Fischer＇ s loading algorithm could be applied into these subchannles according to the new algorithm of joint transmit and receive optimization, Eventually, the optimal transmit power allocated to these subchannels were achieved. The analysis results are consistent with the simulation results. The lower the rate is, the better performance will be achieved in the same MIMO spatial multiplexing system with the same SNR; the more antennas the system has, the better performance will be gained with the same rate,

关 键 词：多入多出 空间复用 联合收发优化 码速率 

分 类 号：TN911[电子电信—通信与信息系统]