用于多小区OFDM系统的分布式上行功率控制算法

为了协调小区间干扰,提高边缘用户性能,研究了OFDM系统多小区间的功率分配问题.基于非合作博弈理论,给出既可以保证每个用户信干比最小又考虑其他小区同信道干扰的效用函数.通过求解最大效用函数值,得到一种多小区分布式上行功率控制算法.该算法中每个小区只需本地信息就可以协调小区间干扰,实现了用户间公平性与频谱利用率的最佳折中.通过仿真分析,讨论了算法的参数选取,验证了算法的收敛性.仿真结果表明,与等功率分配相比,虽然吞吐量下降了17%,但是公平性提高了1.7倍.

Distributed Uplink Power Control Algorithm for Multi-cell OFDM Systems

The power allocation problem in multi-cell OFDM systems is studied in order to coordinate the co-channel interference(CCI)and improve the users performance in cell edge.Based on the non-cooperative game,a payoff function is defined,which would provide a minimum signal interference ratio(SIR)for each user and consider the CCI from other cells.A multi-cell distributed uplink power control algorithm(MDUPC) is derived by maximizing the payoff value.The MDUPC only needs the local information to coordinate inter- cell interference and achieves the best tradeoff between the fairness of users and the spectral efficiency.In the simulation,the parameter selection of the MDUPC is discussed,and the convergence of this algorithm is veri- fied.Compared with the equal power allocation scheme,the simulation results show that the proposed algo- rithm improves the fairness by 1.7 times with a deceasing 17% throughput.