编码V-BLAST的最优功率和速率分配
Optimum Power and Rate Allocation for Coded V-BLAST
摘要:
提出了一种在保持速率接近系统容量的同时,最小化编码空间复用系统中断概率的分析框架。在此基础上,给出了编码V-BLAST结构的最优功率和速率分配策略,并对其性能进行了分析。提出了一种分数注水算法,该算法可以优化编码V-BLAST的容量和中断概率。紧凑,封闭形式的平均功率的最佳分配的表达式。平均功率的均匀分配被证明是接近最佳的在中等到高SNR的编码V-BLAST与平均速率分配(当每个流的速率被设置为匹配每个流的容量)。报告的结果也适用于多用户检测和信道均衡依赖于连续干扰消除。
英文摘要:
An analytical framework for minimizing the outage probability of a coded spatial multiplexing system while keeping the rate close to the capacity is developed. Based on this framework, specific strategies of optimum power and rate allocation for the coded V-BLAST architecture are obtained and its performance is analyzed. A fractional waterfilling algorithm, which is shown to optimize both the capacity and the outage probability of the coded V-BLAST, is proposed. Compact, closed-form expressions for the optimum allocation of the average power are given. The uniform allocation of average power is shown to be near optimum at moderate to high SNR for the coded V-BLAST with the average rate allocation (when per-stream rates are set to match the per-stream capacity). The results reported also apply to multiuser detection and channel equalization relying on successive interference cancelation.
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