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  • 曲 晶,张 婷.多径衰落信道MPSK信号超指数迭代盲解调算法[J].电讯技术,2014,54(3): - .    [点击复制]
  • QU Jing,ZHANG Ting.Blind demodulation of MPSK signals in multipath fading channels based on SEI-FSE-CMA[J].,2014,54(3): - .   [点击复制]
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多径衰落信道MPSK信号超指数迭代盲解调算法
曲晶,张婷
0
(解放军信息工程大学 信息系统工程学院,郑州 450002)
摘要:
为了提高多径衰落信道下的盲解调性能,提出了一种结构简单的MPSK信号盲解调算法。首先利用超指数迭代分数间隔盲均衡器实现联合定时同步与均衡,然后对均衡器输出信号进行非线性变换实现载波频偏的估计,最后利用二阶数字判决锁相环跟踪相位变化纠正剩余频偏和相偏。仿真结果表明,在多径衰落信道条件下,与现有算法相比,基于超指数迭代分数间隔盲均衡器的盲解调算法实现简单,误码率低,而且具有收敛速度快、性能稳定等优点。
关键词:  多径衰落信道  MPSK信号  盲解调;超指数迭代;分数间隔均衡
DOI:
基金项目:国家自然科学基金资助项目(61072046);河南省基础与前沿基金项目(1123004100322)
Blind demodulation of MPSK signals in multipath fading channels based on SEI-FSE-CMA
QU Jing,ZHANG Ting
()
Abstract:
To improve the performance of blind demodulation in multipath fading channels, a simple blind demodulation algorithm of Multiple Phase Shift Keying(MPSK) signals is proposed. The blind super-exponential iteration fractionally-spaced equalizer is introduced to achieve the time-recovery and equalization firstly. Then the carrier-frequency offset is estimated by nonlinear transformation. Finally, the second-order digital phase-locked loop is exploited to track the phase offset. Simulation results show that the algorithm exhibits lower bit error rate(BER), fast convergence speed and great stability in multipath fading channels.
Key words:  multipath fading channel  MPSK signal  blind demodulation  super-exponential iteration  fractionally-spaced equalizer
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