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首页> 外文期刊>IEEE Transactions on Signal Processing >The Amplify-and-Forward Half-Duplex Cooperative System: Pairwise Error Probability and Precoder Design
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The Amplify-and-Forward Half-Duplex Cooperative System: Pairwise Error Probability and Precoder Design

机译：放大转发半双工协作系统：成对错误概率和预编码器设计

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摘要

In this paper, an exact asymptotic pairwise error probability (PEP) is derived for a half-duplex cooperative system employing an amplify-and-forward (AF) protocol. When compared with the PEP of a traditional multiple-input multiple-output (MIMO) system, the "diversity gain" for the cooperative system is no longer just a simple exponential function of the signal-to-noise ratio (SNR), rather, it involves the logarithm of the SNR. The term diversity gain function is used to designate this characteristic of the PEP. The coding gain, on the other hand, is found similar to that for the MIMO system and is proportional to the determinant of the autocorrelation of the error matrix. Based on our analysis and observations, we propose a design of unitary precoder for the cooperative system to achieve the full diversity gain function. For the case of a 4-QAM signal being transmitted, we further optimize the coding gain and arrive at a closed-form optimum precoder. Simulations indicate that our proposed precoder designs greatly improve the performance of the cooperative system
机译：在本文中，使用放大转发（AF）协议为半双工协作系统导出了精确的渐近成对错误概率（PEP）。与传统的多输入多输出（MIMO）系统的PEP相比，协作系统的“分集增益”不再仅仅是信噪比（SNR）的简单指数函数，而是它涉及SNR的对数。术语分集增益函数用于指定PEP的此特性。另一方面，发现编码增益类似于MIMO系统的编码增益，并且与误差矩阵的自相关的决定因素成比例。基于我们的分析和观察，我们提出了一种用于协作系统的单一预编码器的设计，以实现全分集增益功能。对于发送4-QAM信号的情况，我们进一步优化了编码增益，并得出了封闭形式的最佳预编码器。仿真表明，我们提出的预编码器设计大大提高了协作系统的性能

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