通信学报 ›› 2015, Vol. 36 ›› Issue (5): 140-147.doi: 10.11959/j.issn.1000-436x.2015110

• 学术论文 • 上一篇    下一篇

平坦慢衰落信道下基于HOS的PSK调制盲信道估计

李啸天1,2,雷菁2,刘伟2,李艳斌1,张润生1   

  1. 1 中国电子科技集团公司 第五十四研究所,河北 石家庄 050081
    2 国防科学技术大学 电子科学与工程学院,湖南 长沙 410073
  • 出版日期:2015-05-20 发布日期:2015-07-17
  • 基金资助:
    国家自然科学基金资助项目;国家自然科学基金资助项目

High-order statistics based blind channel estimation for PSK modulation in flat and slow fading channels

IXiao-tian L1,2,EIJing L2,LIUWei ,2,IYan-bin L1,HANGRun-sheng Z1   

  1. 1 The 54th Research Institute,CETC,Shijiazhuang 050081,China
    2 School of Electronic Science and Engineering,National University of Defense Technology,Changsha 410073,China
  • Online:2015-05-20 Published:2015-07-17
  • Supported by:
    The National Natural Science Foundation of China;The National Natural Science Foundation of China

摘要:

提出一种基于符号高阶统计量(HOS,high-order statistics)的MPSK调制信道衰落系数盲估计算法。针对平坦慢衰落信道模型,首先分析了MPSK调制符号高阶统计量特征,证明了MPSK调制符号的M次方符号的值是唯一的,而当1≤M′<M时,调制符号的M'次方符号在复平面上是对称分布的;之后利用此特征推导出MPSK调制阶数、初始相位和衰落系数估计算法。仿真实验表明,信噪比高于12 dB条件下,HOS算法估计性能与目前平坦慢衰落信道盲估计的主流方法Lloyd-Max算法相同,而算法复杂度为Lloyd-Max算法的1/50,并且在接收样本符号较少的条件下HOS算法的均方误差曲线收敛于最小二乘估计理论下界。

关键词: 平坦慢衰落, 盲估计, 高阶统计量, PSK调制, Lloyd-Max算法

Abstract:

A blind channel estimator based on high-order statistics (HOS) of PSK constellations was proposed.For flat and slow fading channels,firstly,the high-order statistics of PSK constellations with different alphabet size M was ana-lyzed.The Mth power symbols of MPSK constellations are same,whereas the Mthpower symbols are symmetrically dis-tributed on the complex plane when 1≤M′<M.Secondly,the estimation algorithms of alphabet size M,initial phase and fading coefficient were introduced based on the characteristics above.Finally,simulation results show that when SNR>12 dB,the proposed algorithm has the same estimation performance as the optimal Lloyd-Max algorithm,while the complexity is only 1/50 of Lloyd-Max algorithm.Moreover,the proposed algorithm's mean-square error curve converges remarkably to the least squares (LS) bound on the condition of less received symbols.

Key words: flat and slow fading, blind channel estimation, high-order statistics (HOS), PSK constellations, Lloyd-Max algorithm

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