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Performance analysis of SNR threshold-setting strategies for adaptive modulation and coding under fading channels

机译：衰落信道下自适应调制编码的SNR门限设置策略性能分析

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摘要

Adaptive Modulation and Coding (AMC) is a popular technique that dynamically adapts the employed Modulation and Coding Scheme (MCS) to the instantaneous channel quality, typically expressed in terms of the instantaneous Signal-to-Noise Ratio (SNR). The optimum MCS is selected based on a set of SNR thresholds, which define the range of SNR values on which each MCS is employed. The calculation of the SNR thresholds is a key aspect in the design and performance of AMC. This work performs a detailed and rigorous analysis of SNR threshold setting strategies for AMC, not only considering conventional methods commonly used in the literature but also proposing new methods to attain specific performance targets in terms of error rate, delay and spectral/energy efficiency. Closed-form expressions for these performance metrics are analytically derived under Rayleigh fading and employed to comparatively assess the performance of the considered solutions. The obtained results demonstrate that the proposed SNR threshold setting methods provide significant improvements in terms of error rate, delay and spectral/energy efficiency with respect to traditional methods.
机译：自适应调制和编码（AMC）是一种流行的技术，可以使采用的调制和编码方案（MCS）动态适应瞬时信道质量，通常以瞬时信噪比（SNR）表示。基于一组SNR阈值选择最佳MCS，该阈值定义了采用每个MCS的SNR值的范围。 SNR阈值的计算是AMC设计和性能的关键方面。这项工作对AMC的SNR阈值设置策略进行了详细而严格的分析，不仅考虑了文献中常用的常规方法，而且还提出了新的方法以在错误率，延迟和频谱/能量效率方面达到特定的性能目标。这些性能指标的闭式表达式是在瑞利衰落下进行分析得出的，并用于比较评估所考虑解决方案的性能。获得的结果表明，相对于传统方法，所提出的SNR阈值设置方法在误码率，延迟和频谱/能量效率方面提供了显着的改进。

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