计算机科学 ›› 2016, Vol. 43 ›› Issue (11): 172-175.doi: 10.11896/j.issn.1002-137X.2016.11.033
端木春江,王振宇
DUANMU Chun-jiang and WANG Zhen-yu
摘要： 混合译码放大转发(Hybrid Decode-Amplify-Forward,HDAF)协议与放大转发、译码转发协议相比,能在很大程度上提高系统的性能,成为近年来的研究热点。在此,研究了在混合译码放大转发协议下的最优功率分配问题。首先推导了高信噪比(Signal-to-Noise Ratio,SNR)下混合译码放大转发协议中的误符号率的近似和实用的表达式；然后通过建立数学模型,在满足总功率一定的情况下,以最小化系统的误符号率为目标,优化分配系统的总功率；最后在Matlab环境下验证推导结果并做了大量的仿真实验。实验结果表明,所推导的近似的误符号率的表达式与实际误符号率在稍高的信噪比下具有很好的吻合度。混合译码放大转发协议的最优功率分配因子不仅与源节点到中继节点、中继节点到目的节点的信道质量有关,而且与系统的总功率有关。研究发现,随着系统总功率的增大,最优功率分配因子将趋近于1/2。
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