蜂窝系统中最优功率控制自适应调制的性能分析

A. Ramesh, A. Chockalingam
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引用次数: 8

摘要

在对数正态阴影和多径瑞利衰落信道中,给出了最优功率控制自适应调制的系统吞吐量和中断概率性能。我们提出了两个目标函数,即最大SIR最优功率控制和最小停电概率最优功率控制。提出了一种基于动态规划的最佳发射功率矢量求解方法。使用所提出的目标函数获得的系统性能与Qiu等人(1999)考虑的使用其他目标函数获得的性能进行比较。结果表明:(a)就系统总吞吐量而言,最优功率控制的自适应调制方案比其他方案具有最佳性能;(b)在停电概率方面,停电概率最小的最优功率控制具有最佳性能;(c)最大SIR最优功率控制,通过均匀分配系统容量,使系统中的每个用户受益。
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Performance analysis of adaptive modulation with optimum power control in cellular systems
We derive the system throughput and outage probability performance of adaptive modulation with optimal power control in log-normal shadowing and multipath Rayleigh fading channels. We propose two objective functions, namely, maximum SIR optimum power control and minimum outage probability optimum power control. A dynamic programming-based solution to find the optimum transmit power vector is presented. System performance achieved using the proposed objective functions is compared with the performance achieved using other objective functions considered by Qiu et al., (1999). Our results show that: (a) in terms of total system throughput, adaptive modulation with optimum power control gives the best performance compared to other schemes; (b) in terms of outage probability, minimum outage probability optimum power control gives the best performance; and (c) maximum SIR optimum power control benefits every user in the system by evenly distributing the system capacity.
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