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双差分协作传输的误码率性能分析和最佳功率分配 被引量：1

SER Performance Analysis and Optimum Power Allocation for Double Differential Cooperative Transmission
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摘要 为了克服协作传输中的载波频率偏移,提出了一种采用正交幅度调制(QAM)的双差分协作传输(DDCT)方案。推导了误符号率(SER)的闭合表达式、SER的上界以及高信噪比(SNR)下的渐进近似。基于SER的渐进近似,推导了最佳功率分配(OPA)在高SNR下的近似解。仿真结果显示,该OPA的近似解在实际中等的SNR环境中仍然有效。比较了DDCT分别采用相同调制阶数的QAM调制和PSK调制的SER。当调制阶数大于8时,DDCT-QAM比DDCT-PSK具有更好的SER性能。尤其当调制阶数等于64时,DDCT-QAM可以获得4.5 dB的SNR增益。 A double differential cooperative transmission （DDCT） scheme using quadrature amplitude modulation （QAM） is proposed to overcome carrier frequency offset in cooperative transmission. A closed-form symbol error rate （SER） formulation, an SER upper bound, and an asymptotic SER approximation at high SNR are derived. Based on the asymptotic SER approximation, an approximate solution of optimum power allocation （OPA） at high signal-to-noise ratio （SNR） is derived. The simulation results demonstrate that the approximate solution of OPA also provides a good solution to a realistic moderate SNR scenario. The SER performance of DDCT with QAM modulation and DDCT with phase shift keying （PSK） modulation is compared in condition of same modulation order. The comparison results demonstrate that DDCT-QAM outperforms the DDCT-PSK, when the modulation order is larger than 8. Specially, when the modulation order equals to 64, DDCT-QAM obtains a 4.5 dB SNR gain.
作者 高洋 葛建华 谢大平
机构地区 西安电子科技大学综合业务网国家重点实验室
出处 《电子科技大学学报》 EI CAS CSCD 北大核心 2011年第2期185-191,共7页 Journal of University of Electronic Science and Technology of China
基金 长江学者和创新团队发展计划(IRT0852) 国家科技重大专项(2009ZX03003-003 2009ZX03003-004) 国家111计划(B08038) 国家自然科学基金(61001207) 中央高校基本科研业务费专项资金(K50510010017)
关键词 协作传输 双差分调制 频率偏移 正交幅度调制 误符号率 cooperative transmission double differential modulation frequency offset quadrature amplitude modulation symbol error rate
分类号 TN929.5 [电子电信—通信与信息系统]
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参考文献16

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二级参考文献14

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电子科技大学学报
2011年 第2期

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