| 一种低信噪比解调的实现方案及性能仿真 |
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| 引用本文： | 潘申富,张丽娜.一种低信噪比解调的实现方案及性能仿真[J].无线电通信技术,2011,37(2):55-58. |
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| 作者姓名： | 潘申富 张丽娜 |
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| 作者单位： | 中国电子科技集团第五十四研究所,河北石家庄,050081 |
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| 摘 要： | 高效率编码技术(如LDPC,Turbo码)的发展迫切要求降低解调门限。提出一种适用于QPSK调制方式的低信噪比解调方案,该方案采用频域非线性定时估计算法进行定时误差估计,利用FFT进行载波频差估计,利用周期性插入的导频序列进行载波相位估计。首先仿真了定时误差和载波相位误差对解调性能的影响,并在此基础上确定了算法的具体参数,最后对解调器的综合性能进行了仿真,仿真结果表明上述算法在Es/N0=2dB时的解调性能恶化小于0.5 dB。
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| 关 键 词： | 低信噪比解调 定时恢复 载波恢复 导频 |
Implementation and Performance Simulation for Demodulator at Low SNR |
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| PAN Shen-fu,ZHANG Li-na.Implementation and Performance Simulation for Demodulator at Low SNR[J].Radio Communications Technology,2011,37(2):55-58. |
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| Authors: | PAN Shen-fu ZHANG Li-na |
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| Affiliation: | PAN Shen-fu,ZHANG Li-na(The 54th Research Institute of CETC,Shijiazhuang Hebei 050081,China) |
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| Abstract: | An implementation solution for QPSK demodulator at low SNR is proposed to make the best of the capability of the highly efficient channel encoder technique,such as LDPC coder and Turbo coder.Firstly,timing error is obtained by using the frequency domain nonlinear timing estimate algorithm,and then FFT is used to estimate carrier frequency error,at last periodical pilot sequences is inserted to estimate carrier phase.Performance debasement caused by timing error or carrier phase error is first simulated to d... |
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| Keywords: | demodulation at low SNR timing recovery carrier recovery pilot |
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