摘要
研究了DSTC的无线中继网络中基于多用户公平性的功率分配策略。由于每个用户具有不同的信道状态,传统的功率分配方案不能满足各用户的QoS需求。为了满足用户之间的公平性,首先建立无线中继AF模式下的网络模型,然后结合LD空时码,运用最优机会中继策略,得到用户最大即时接收SNR,并在基站与中继分配功率受限条件下建立最大最差用户信道容量的功率分配方案。因为该问题是非线性、非凸优化问题,所以把优化问题转换为GP问题进行求解。仿真结果表明,所提功率分配方案与等功率分配、功率与信道状态成正比方案相比,不但改善了最差用户的性能,并能有效地保证用户间的公平性。
This paper studied the power allocation strategies based on multi-user fairness in AF wireless relay networks which apply distributed space-time coding（ DSTC） . Since each user has different channel condition,the conventional power allocation strategies can not meet the need of each user’s QoS. In order to satisfy the fairness of users,first proposed the system model of the wireless relay network with AF mode,then combined with distributed linear dispersion （ LD） code,and applied the best opportunistic relaying scheme to get the highest instantaneous received SNR at user,and subject to the limited of the power of BS and RS,proposed novel power allocation schemes which maximized the worst user’s channel capacity. Since the problem was nonlinear and non-convex,the optimization problem was formulated using geometric programming （ GP） . The simulation results show clearly that,compared with the schemes of equal power allocation and proportion to channel gain,the strategie can improve the performace of the worst user,and it also can efficiently guarantee the fairness of users.
出处
《计算机应用研究》
CSCD
北大核心
2010年第10期3947-3949,3954,共4页
Application Research of Computers
基金
国家自然科学基金资助项目(60972070)
新世纪优秀人才支持计划资助项目(NCET-06-0778)
关键词
AF模式中继
分布式空时码
功率分配
公平性
几何优化
AF mode relay
distributed space-time codes
power allocation
fairness
geometric programming
