OFDM-SDMA系统上行资源分配算法  

Resource allocation algorithm in uplink OFDM-SDMA systems

作　　者：马守贵[1] 唐苏文[1] 陈明[1] 

机构地区：[1]东南大学移动通信国家重点实验室,南京210096

出　　处：《东南大学学报（自然科学版）》2009年第3期436-441,共6页Journal of Southeast University：Natural Science Edition

基　　金：国家高技术研究发展计划(863计划)资助项目(2007AA01Z207);东南大学移动通信国家重点实验室研究课题资助项目(2008A06)

摘　　要：针对OFDM-SDMA系统的上行链路,以系统吞吐量最大为目标,建立资源分配问题的优化模型,提出一种低复杂度的次优资源分配算法.该算法分为载波分配和功率分配2部分:载波分配算法在功率平均分配的假设下为每个子载波选择用户集合;功率分配算法在载波分配的基础上,考虑相同载波上的干扰对用户进行注水功率分配.仿真结果表明:该算法获得的系统容量与传统OFDMA系统资源分配算法相比有较大幅度的提高;载波分配算法能很好地适应上行链路的特点,其性能优于下行链路载波分配算法;有扰信道注水功率分配亦优于固定功率分配算法.A resource allocation model targeting at maximizing the system throughput in uplink OFDM-SDMA （orthogonal frequency division multiplexing-space division multiple access） systems was established. Then, a suboptimum algorithm with low complexity is proposed. The algorithm contains two parts： subcarrier allocation and power allocation. The former selects a user set for each subcarrier under the hypothesis of equal power distribution. The latter, based on subcarrier allocation, employs water-filling to maximize the sum capacity taking co-channel interference into consideration. Simulation results show that the system throughput obtained by the proposed algorithm in OFDM-SDMA systems increases considerably, compared with OFDMA systems. The subcarrier allocation algorithm is better fit for the features of uplink and its performance is superior to the downlink algorithm. Capability achieved by the water-filling algorithm is beyond the fixed power allocation algorithm.

关 键 词：OFDM-SDMA 载波分配 功率分配 有扰信道 注水算法 

分 类 号：TN929.5[电子电信—通信与信息系统]