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电子学报  2013 

具有时延QoS保证的OFDM中继系统子载波配对与功率分配算法

DOI: 10.3969/j.issn.0372-2112.2013.02.020, PP. 335-339

Keywords: 正交频分复用,无线中继,服务质量,子载波配对与功率分配,有效容量,凸优化

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Abstract:

本文研究具有直接通信链路的OFDM解码转发(Decode-and-Forward,DF)中继系统的子载波配对与功率分配算法,目标是在满足业务时延QoS要求的前提下最大化系统容量.利用有效容量模型,首先把OFDMDF中继系统的子载波配对与功率分配问题形成为混合整数规划问题,然后把其转化为连续松弛凸规划问题,利用凸优化方法得到原问题的最优解,从而提出了一种联合最优的子载波配对与功率分配迭代算法.理论推导结果和仿真结果表明,最优子载波配对与功率分配不仅取决于子载波的信道增益,还取决于业务的时延QoS要求.与已有算法相比,本文算法获得的有效容量最大.

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