基于博弈论的OFDMA系统多小区功率协调分配算法

Multicell adaptive power allocation scheme based on game theory in OFDMA systems

提出了一种用于正交频分多址(OFDMA)通信系统下行链路的多小区功率协调分配算法,协调相邻小区在同频子信道上的发送功率,抑制小区间干扰,提高信道容量。将博弈论引入到多小区功率分配中,给出基于定价的多小区非合作功率分配博弈模型,并分析了该博弈的纳什均衡解的存在性和惟一性,给出了该模型的分布式求解算法。通过仿真分别给出了单小区场景与多小区场景下算法性能,讨论了定价因子对系统性能的影响。仿真结果表明,提出的多小区功率协调分配算法可以充分利用无线资源,提高系统吞吐量,降低平均发送功率。

A multicell power coordinated allocation scheme was proposed for downlink orthogonal frequency division multiple access （OFDMA） cellular systems. Transmit power levels of co-subchannels were coordinated among inter-cell, consequently inter-cell interference was mitigated and channel capacity was increased. Game theory was employed in the multiceU power allocation. A multicell non-cooperative power allocation game framework was presented via pricing. The existence and uniqueness of Nash equilibrium of this game framework was analyzed, and a distributed algorithm for this game was proposed. The performance of the proposed scheme is verified by simulation in the single cell and multiple cell scenario respectively, as well as the influence of pricing factor on system performance. Simulation results show that the multiceU power coordinated allocation scheme proposed will improve radio resource efficiency, increase throughput of the system, and reduce the average transmit power.