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Abstract: An analytical framework for minimizing the outage probability of a codedspatial multiplexing system while keeping the rate close to the capacity isdeveloped. Based on this framework, specific strategies of optimum power andrate allocation for the coded V-BLAST architecture are obtained and itsperformance is analyzed. A fractional waterfilling algorithm, which is shown tooptimize both the capacity and the outage probability of the coded V-BLAST, isproposed. Compact, closed-form expressions for the optimum allocation of theaverage power are given. The uniform allocation of average power is shown to benear optimum at moderate to high SNR for the coded V-BLAST with the averagerate allocation when per-stream rates are set to match the per-streamcapacity. The results reported also apply to multiuser detection and channelequalization relying on successive interference cancelation.



Author: Victoria Kostina, Sergey Loyka

Source: https://arxiv.org/







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