MIMO-OFDMA系统下行链路的一种自适应资源分配方案  

An Adaptive Resource Allocation Scheme for MIMO-OFDMA Downlinks

作　　者：刘敏[1] 徐大专[2] 

机构地区：[1]南通大学电子信息学院,江苏南通226019 [2]南京航空航天大学信息科学与技术学院,江苏南京210016

出　　处：《四川大学学报（工程科学版）》2010年第3期177-183,共7页Journal of Sichuan University (Engineering Science Edition)

基　　金：江苏省自然科学基金资助项目(BK2007192)

摘　　要：为了在MIMO-OFDMA系统中利用延时的信道状态信息极大化系统吞吐量,提出了一种结合正交空时分组码与特征波束形成的传输方案,并在上述传输方案中提出一种低复杂度的两步子载波分配算法。首先根据用户平均信道质量与速率需求分配带宽,然后遵循标定星座距离最小的准则依次将各子载波指派给用户,获得多用户分集增益。最后在子载波间分配功率确保达到用户速率要求。仿真结果表明,该方案能充分利用具有时延的信道状态信息和多个发射天线有效提高系统吞吐量。In order to maximize the throughput of MIMO-OFDMA downlinks by using delayed channel state information,an adaptive transmission scheme combining Orthogonal Space-Time Block Code and eigen-beamforming was proposed,and subsequently a computationally efficient two-step sub-carrier allocation algorithm was presented.This scheme allocated bandwidth for every user based on their average channel state and data rate requirement.Then each sub-carrier was assigned to users according to the minimum scaled constellation distance criterion,capturing multi-user diversity gain.Finally available power was distributed among sub-carriers to ensure each user＇s data rate requirement.Simulation results showed that the scheme could make use of delayed channel state information and multiple transmit antennas to increase throughput.

关 键 词：多用户 正交频分复用 多输入多输出 资源分配 延时信道状态信息 

分 类 号：TN929.5[电子电信—通信与信息系统]