多天线OFDM系统中的自适应子信道分配和天线选择  

Adaptive subchannel allocation and antenna selection in MIMO-OFDM system

作　　者：余官定[1] 张朝阳[1] 来萍[1] 储珊[1] 仇佩亮[1] 

机构地区：[1]浙江大学信电系信息与通信工程研究所,浙江杭州310027

出　　处：《电路与系统学报》2005年第6期63-68,共6页Journal of Circuits and Systems

基　　金：国家自然科学基金项目(60472079);浙江省自然科学基金重点项目(Z104252);浙江省科技计划项目(2005C21005)

摘　　要：针对多用户MIMO-OFDM系统,提出自适应子信道分配算法。首先将相邻的子载波分块成若干子信道,在分配子信道的时候优先考虑平均信道容量小的用户,并且将相对利用度大的子信道分配给该用户,从而在频谱利用率和公平性上具有较好的性能。为了降低发送端的硬件复杂度以及非线性因素的影响,将自适应信道分配和发送天线选择相结合,提出联合自适应子信道分配和天线选择算法。仿真结果表明,本文提出的联合算法具有较高的频谱效率和较低的中断概率。A novel adaptive subchannel allocation algorithm is proposed for multi-user MIMO-OFDM system. All subcarriers are divided into several subchannels. Then, priority is given to users with lower average channel capacity and subchannel with the highest utilization efficiency is allocated to this user. Thus, a high spectral efficiency is achieved as well as the performance on fairness. In order to deduce the transmitter complexity and the impact caused by non-linearity, we introduce antenna selection into the subchannel allocation algorithm and propose a joint adaptive subchannel allocation and antenna selection algorithm. Simulation results show that the spectral efficiency is improved and the outage probability is decreased in the proposed joint algorithm.

关 键 词：MIMO-OFDM 自适应调制 天线选择 子信道分配 

分 类 号：TN925.5[电子电信—通信与信息系统]