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北京交通大学轨道交通控制与安全国家重点实验室,北京 100044
[ "刘钰(1995-),女,内蒙古包头人,北京交通大学博士生,主要研究方向为认知无线电和信号识别技术。" ]
[ "王方刚(1982-),男,北京人,博士,北京交通大学教授,主要研究方向为无线通信、信号处理和信息论。" ]
[ "张静文(1990-),女,北京人,博士,主要研究方向为认知无线电和信号识别技术。" ]
[ "艾渤(1974-),男,北京人,博士,北京交通大学教授,主要研究方向为铁路无线通信与铁路控制理论与技术。" ]
[ "钟章队(1962-),男,北京人,北京交通大学教授,主要研究方向为铁路无线通信、铁路控制理论与技术。" ]
网络出版日期:2018-09,
纸质出版日期:2018-09-25
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刘钰, 王方刚, 张静文, 等. 多径信道下基于EM算法的盲LDPC编码器识别研究[J]. 通信学报, 2018,39(9):43-48.
Yu LIU, Fanggang WANG, Jingwen ZHANG, et al. EM-based blind LDPC identification in multipath channels[J]. Journal on communications, 2018, 39(9): 43-48.
刘钰, 王方刚, 张静文, 等. 多径信道下基于EM算法的盲LDPC编码器识别研究[J]. 通信学报, 2018,39(9):43-48. DOI: 10.11959/j.issn.1000-436x.2018153.
Yu LIU, Fanggang WANG, Jingwen ZHANG, et al. EM-based blind LDPC identification in multipath channels[J]. Journal on communications, 2018, 39(9): 43-48. DOI: 10.11959/j.issn.1000-436x.2018153.
随着认知无线电的出现,盲编码器识别引起了广泛的关注。现有相关工作主要集中在加性高斯白噪声(AWGN)信道,而多径场景下的盲识别尚未得到充分研究。考虑未知多径衰落信道下的盲低密度奇偶校验码(LDPC)识别,提出了基于期望最大化(EM)算法的似然分类器,以获得未知参数的最大似然估计值,并采用平均对数似然比(LLR)估计器对未知编码器进行识别。数值结果表明,该算法在多径信道中具有良好的识别性能,特别是在低信噪比区域。
As the advent of cognitive radios
blind encoder identification has attracted increasingly attentions since it plays an important role.The existing works mainly focus on additive white Gaussian noise (AWGN) channel
while the blind identification in multipath scenarios has not been sufficiently investigated.Considering the blind low density parity-check (LDPC) codes identification in the presence of unknown multipath fading channel
a likelihood-based classifier was proposed using the expectation maximization (EM) algorithm to obtain the maximum likelihood estimates of the unknown parameters.Then
an average log-likelihood ratio (LLR) estimator was adopted to classify the unknown encoder.Numerical results show that the proposed algorithm provides promising identification performance in multipath channels
especially in the low signal-to-noise ratio region.
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