空间复用MIMO系统的功率分配新算法  

Novel Algorithm of Power Allocation in Spatial Multiplexing Scheme of MIMO System

作　　者：杨宇[1] 匡镜明[1] 费泽松[1] 

机构地区：[1]北京理工大学信息科学技术学院电子工程系,北京100081

出　　处：《北京理工大学学报》2006年第7期630-633,共4页Transactions of Beijing Institute of Technology

基　　金：与爱立信公司的国际合作项目

摘　　要：研究空间复用多输入多输出系统的功率分配问题,提出一种新的功率分配算法———残余功率再分配.在满足服务质量要求的前提下充分利用星座图尺寸的离散性,将残余功率按照各子信道的不同优先级进行二次分配,并结合自适应调制编码技术改善低信噪比时的系统吞吐量.仿真结果表明,在准静态平坦衰落信道下,与传统算法(如注水算法)相比,新算法能进一步改善系统的吞吐量,提高发射功率的使用效率,减少不可用子信道个数,且无附加复杂度.Proposes a novel algorithm of power allocation, called re-allocation of residual power （RARP）, in the spatial multiplexing scheme of multiple input multiple output （MIMO） system. Combined with the adaptive modulation and coding technology, this algorithm reallocates the residual power by effectively utilizing the discrete modulation orders according to the different priorities of subchannels under the limitation of quality of service over the block fading channel. Simulation results showed that the new method can improve the system throughput, obtain higher transmit power utilization and decrease the number of invalid sub-channels without additional complexity when compared with the conventional power allocation algorithm.

关 键 词：多输入多输出系统 功率分配 自适应调制编码 吞吐量 

分 类 号：TN911.25[电子电信—通信与信息系统]