一种基于延时信道状态信息的MIMO-OFDM系统自适应功率分配算法  

An adaptive power allocation algorithm using delayed channel state information for MIMO-OFDM systems

作　　者：刘敏[1] 曹张华[1] 

机构地区：[1]南通大学电子信息学院,江苏南通226019

出　　处：《重庆邮电大学学报（自然科学版）》2013年第6期743-747,761,共6页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：国家自然科学基金(61071086);江苏省高校自然科学基金(10KJB510020)~~

摘　　要：在基于正交频分复用的多输入多输出(multiple-input-multiple-output-orthogonal frequency divided multiplexing,MIMO-OFDM)系统中,适当的功率分配方案能够显著提高系统吞吐量,但是其复杂度往往较高。研究MIMOOFDM系统的自适应功率分配问题。以系统的和速率最大化为目标,根据延时的信道状态信息在所有空间子信道之间分配功率,同时满足各子信道的误码率约束与系统总功率约束。根据MIMO空间子信道的特点提出了一种复杂度很低的功率分配算法,并分析了算法复杂度。在IMT-2000信道中的仿真表明,提出算法的性能优于已有的次佳算法。Appropriate power allocation schemes can increase the throughput considerably in MIMO （multiple-input-muhi- pie-output）-OFDM（ orthogonal frequency divided multiplexing） systems, but usually with highly computational complexity. The problem of adaptive power allocation is addressed for MIMO-OFDM systems in this paper. Aiming to maximize the sys- tem sum-rate, the overall power is allocated among spatial subchannels based on delayed channel state information; at the same time the total power constraint and bit-error-rate requirements are satisfied. A power allocation algorithm with low complexity is proposed on the basis of the characteristic of spatial subchannels. Then its computational complexity is ana- lyzed. Simulations in IMT-2000 channels demonstrate that the proposed algorithm outperforms existing sub-optimal algo- rithms.

关 键 词：多输入多输出(MIMO) 正交频分复用(OFDM) 功率分配 信道状态信息 

分 类 号：TN929.5[电子电信—通信与信息系统]