平坦慢衰落信道下基于HOS的PSK调制盲信道估计

doi:10.11959/j.issn.1000-436x.2015110

Abstract

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 M^th power symbols of MPSK constellations are same,whereas the M^thpower 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

IXiao-tian L,EIJing L,LIUWei ,,IYan-bin L,HANGRun-sheng Z. High-order statistics based blind channel estimation for PSK modulation in flat and slow fading channels[J]. Journal on Communications, 2015, 36(5): 140-147.

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调制方式	Lloyd-Max算法	HOS算法
BPSK	4.7 ms	0.133 ms
QPSK	5.8 ms	0.175 ms
8PSK	7.9 ms	0.178 ms

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

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