| 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： |
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| 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) |
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| 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 |
