速率比例公平下多用户OFDM系统的自适应资源分配  

Adaptive Resource Allocation with Proportional Rate Constraints in MU-OFDM Systems

作　　者：李圣[1] 龚学余[1] 

机构地区：[1]南华大学电气与电子工程学院,湖南衡阳421001

出　　处：《电讯技术》2010年第6期5-10,共6页Telecommunication Engineering

基　　金：国家自然科学基金资助项目(10775066);湖南省教育厅资助科研项目(07C643)~~

摘　　要：在多用户正交频分复用(MU-OFDM)系统中,考虑各个用户之间具有比例数据传输速率限制条件下的一种公平的自适应资源分配方案的最优算法计算量巨大,为此,提出了一种将子信道分配和功率分配相分离的次优算法。首先,在假设相同功率分配的情况下进行子信道的分配,然后在保持一定比例公平条件下使总容量最大时进行最优功率分配。对该算法的仿真表明,在用户数为2、子信道数为10的系统中,所提算法的容量性能接近最优算法,而计算量由指数增长变为线性增长。所提资源分配算法的总容量比以前的算法在用户间的分配更公平也更灵活。The computation of the adaptive resource allocation with proportional data rote constraints in muhiuser orthogonal frequency division multiplexing （MU-OFDM） system is large when considering the fairness among the users. To avoid the extreme computation complex of the optimal solution, a low-complexity suboptimal algorithm is proposed in which subchannel allocation and power allocation are separated. In the proposed algorithm, subehan- nel allocation is first performed by assuming an identical power allocation. Then an optimal power allocation algo- rithm is carried out to maximize the stun capacity while maintaining proportional fairness. The simulation result of the proposed algorithm shows that approximate performance of the optimal capacity can be achieved in a two-user ten-subchannel system, while the complexity is reduced from exponential to linear. The sum capacity of the pro- posed resource allocation algorithm is more faire and flexible among users than that of the previous.

关 键 词：多用户正交频分复用 资源分配 比例速率限制 次优算法 注水法 

分 类 号：TN929.53[电子电信—通信与信息系统]