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首页> 外文期刊>Communications Letters, IEEE >Optimal Power Control and Error Performance for Full-Duplex Dual-Hop AF Relaying Under Residual Self-Interference
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Optimal Power Control and Error Performance for Full-Duplex Dual-Hop AF Relaying Under Residual Self-Interference

机译：残余自干扰下全双工双跳AF中继的最佳功率控制和错误性能

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摘要

This paper investigates optimal power allocation schemes at the relay and their impact on the error performance for a full-duplex, dual-hop, amplify-and-forward system using finite constellations and under residual self-interference. The variance of the interference is assumed to be proportional to the -th power of the transmitted power. The worst-case pairwise error probability (PEP) is considered as the performance criterion. To find the optimal power allocation, we first derive a closed-form expression for the derivative of the PEP. A simple bisection method is then applied to obtain the optimal scheme. An asymptotically optimal allocation in closed form is also obtained assuming high power regions. From this analysis, it is shown that power allocation leads to a better diversity performance than full power transmission. In addition, the error floor behavior observed in previous works can be eliminated through power allocation. Numerical results are finally presented to illustrate the advantage of the proposed scheme over full power usage.
机译：本文研究了采用有限星座图并在残留自干扰作用下的全双工，双跳，放大转发系统的中继处的最佳功率分配方案及其对误码性能的影响。假定干扰的方差与发射功率的-th功率成正比。最坏情况的成对错误概率（PEP）被视为性能标准。为了找到最佳的功率分配，我们首先导出PEP导数的闭式表达式。然后，应用简单的二等分方法来获得最佳方案。假设高功率区域，也可以获得封闭形式的渐近最优分配。从该分析可以看出，功率分配比全功率传输具有更好的分集性能。此外，可以通过功率分配消除先前工作中观察到的错误基底行为。最后给出了数值结果，以说明所提出的方案相对于全功率使用的优势。

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