| 物理层抽象中平均互信息的精确计算方法 |
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| 引用本文： | 熊磊,张金宝.物理层抽象中平均互信息的精确计算方法[J].重庆邮电学院学报(自然科学版),2011(3). |
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| 作者姓名： | 熊磊 张金宝 |
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| 作者单位： | 北京交通大学轨道交通控制与安全国家重点实验室; |
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| 基金项目： | 国家自然科学基金(60830001); 教育部长江学者和创新团队发展计划项目(IRT0949); 轨道交通控制与安全国家重点实验室(北京交通大学)自主研究课题项目(RCS2008ZT005,RCS2010ZT012); 北京交通大学基本科研业务费项目(2011JBM156)~~ |
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| 摘 要： | 提出一种比特平均互信息(mean mutual information per bit,MMIB)物理层抽象技术平均互信息计算方法。该方法通过数学推导得到16QAM调制符号上各比特的对数似然比(log-likelihood ratio,LLR)的概率分布,并得到平均互信息计算解析表达式。仿真结果表明,提出的计算方法计算精度要明显好于现有方法,特别是在信噪比较低时,其相对误差仅为现有算法的1/5左右,能明显改善MMIB估计性能。
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| 关 键 词： | 无线通信 物理层抽象 互信息 |
A precise calculation method for mean mutual information of PHY layer abstraction |
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| XIONG Lei,ZHANG Jin-bao.A precise calculation method for mean mutual information of PHY layer abstraction[J].Journal of Chongqing University of Posts and Telecommunications(Natural Sciences Edition),2011(3). |
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| Authors: | XIONG Lei ZHANG Jin-bao |
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| Institution: | XIONG Lei,ZHANG Jin-bao (State Key Laboratory of Rail Traffic Control and Safety,Beijing Jiaotong University,Beijing 100044,P.R.China) |
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| Abstract: | In this paper,a novel method to calculate mean mutual information of PHY layer abstraction is proposed.The probability distribution of Log-likelihood ration and analytical expression of mean mutual information are obtained by mathematical deduction.Simulation results show that the accuracy of the proposed method is higher than the present method.Especially in low SNR,the relative derivation error of the proposed method is only 1/5 of that of the present method,which can improve the performance of MMIB PHY l... |
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| Keywords: | wireless communications PHY layer abstraction mutual information(MI) |
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