| LDPC码在QPSK调制下的应用分析 |
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| 引用本文： | 陈正康,马林华,苏强,彭鑫. LDPC码在QPSK调制下的应用分析[J]. 电光与控制, 2010, 17(4) |
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| 作者姓名： | 陈正康 马林华 苏强 彭鑫 |
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| 作者单位： | 空军工程大学工程学院,西安,710038 |
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| 摘 要： | 对低密度奇偶校验码(LDPC)在QPSK调制下的对数似然比(LLR)算法进行了深入研究,分析了LDPC码在QPSK调制下初始消息的计算方法,推导了初始消息的计算公式。同时对该算法进行了程序仿真,仿真结果表明LDPC码在QPSK调制中具有良好的性能。当信噪比为3.5 dB时,误码率可达到10-6数量级。
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| 关 键 词： | 低密度奇偶校验码（LDPC） QPSK 调制 |
Application of Low-Density Parity-Check Codes Under QPSK Modulation |
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| CHEN Zhengkang,MA Linhua,SU Qiang,PENG Xin. Application of Low-Density Parity-Check Codes Under QPSK Modulation[J]. Electronics Optics & Control, 2010, 17(4) |
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| Authors: | CHEN Zhengkang MA Linhua SU Qiang PENG Xin |
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| Affiliation: | Engineering Institute;Air Force Engineering University;Xi'an 710038;China |
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| Abstract: | The Log-Likelihood Ratio(LLR) algorithm of Low-Density Parity-Check Codes(LDPC) under the Quadri Phase-Shift Keying(QPSK) modulation was studied.The initial information computation method of LDPC under QPSK modulation was analyzed.And the formulas of initial information were deduced in detail.Simulations were made for the algorithm and the result showed that the decoding performance of LDPC is fine under QPSK modulation.For example,the Bit Error Rate(BER) can reach 10-6 at 3.5 dB SNR. |
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| Keywords: | QPSK |
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