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对于蜂窝正交频分多址(OFDMA)系统,相邻小区间的同频干扰是影响系统性能提升的重要因素。该文提出了一种用于OFDMA系统上行链路的多小区资源分配算法。该算法基于博弈论,各用户在速率要求限制下以最小化发射功率为目标,在各小区独立进行信道分配的前提下,用户通过基站反馈获得当前的信道分配方案及博弈状态(同频干扰水平),以此为基础进行发射功率分配,实现了一种分布式的资源分配算法。仿真结果表明,博弈算法可大大降低系统的发射功率,且优化信道分配下的博弈算法比固定信道分配下的博弈算法还可降低系统发射功率30%。同时,博弈算法的收敛速度较快,有利于实际实现。
For cellular orthogonal frequency division multiple access (OFDMA) systems, co-channel interference between neighboring cells is an important factor affecting system performance. This paper proposes a multi-cell resource allocation algorithm for OFDMA system uplink. The algorithm is based on game theory. Each user aims at minimizing the transmit power under the limit of the rate. Under the premise of independent channel allocation in each cell, the user obtains the current channel allocation scheme and game state (co-channel interference level ), On the basis of which the transmit power is allocated and a distributed resource allocation algorithm is realized. Simulation results show that the game algorithm can greatly reduce the transmit power of the system, and the game algorithm under the optimized channel allocation can reduce the system transmit power by 30% than the game algorithm under the fixed channel allocation. At the same time, the convergence speed of the game algorithm is faster, which is beneficial to the actual implementation.