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首页> 外文会议>2012 6th International Conference on New Trends in Information Science, Service Science and Data Mining >Censoring and combining in cooperative communications assisted by a relay
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Censoring and combining in cooperative communications assisted by a relay

机译：中继辅助的协作通信中的审查和合并

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A cooperative communication system in which a censorial relay is adopted to assist binary data transmission from a source to a destination is addressed in this paper. A censorial relay is also called a selective DF (decode-and-forward) relay. It censors (i.e. does not pass forward) decisions that are deemed as not reliable enough. The reliability of decisions is measured in terms of the magnitude of the log likelihood ratio (LLR) of a received data bit (from the source). If this magnitude is below some preset threshold, then the data bit is censored. At the destination, the received signals from the source and the relay are lineally combined. The ratio between the coefficients for combining must be properly chosen in order to minimize the BER. In many works found in the literature, those coefficients for combining are chosen according to the maximum ratio combining (MRC) rule. However, it will be shown that MRC is not the optimal choice. We will show what the optimal choice is. Moreover, we will also show what the optimal LLR threshold for censoring is. The key reason for the feasibility of finding the optimal combining coefficients and the optimal censoring threshold is that a closed-form BER formula is derived (and then, of course, is utilized). To further take advantage of this BER formula, it is also used to perform power allocation (PA) between the source and the relay. Results from theoretical analysis and simulation are generated to evaluate the effectiveness of the proposed system. Those results are also compared to some existing relay-assisted cooperative communication systems found in the literature.
机译：本文讨论了一种协作通信系统，其中采用了审查中继来辅助从源到目的地的二进制数据传输。审查中继也称为选择性DF（解码和转发）中继。它审查（即不转发）决策被认为不够可靠的决策。根据接收到的数据位（来自源）的对数似然比（LLR）的大小来衡量决策的可靠性。如果该幅度低于某个预设阈值，则将对数据位进行检查。在目的地，来自源和中继的接收信号被线性组合。必须适当选择用于合并的系数之间的比率，以最小化BER。在文献中发现的许多著作中，用于合并的那些系数是根据最大比率合并（MRC）规则选择的。但是，将显示MRC不是最佳选择。我们将展示最佳选择。此外，我们还将显示用于审查的最佳LLR阈值是多少。找到最佳组合系数和最佳检查阈值的可行性的关键原因是，得出了一个封闭形式的BER公式（然后当然使用了它）。为了进一步利用此BER公式，它还用于在源和中继之间执行功率分配（PA）。从理论分析和仿真得出结果，以评估所提出系统的有效性。还将这些结果与文献中发现的一些现有的中继辅助协作通信系统进行了比较。

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