| 基于非正则LDPC编码的OFDM高阶调制系统 |
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| 引用本文： | 胡锦涛,王永生,周奋.基于非正则LDPC编码的OFDM高阶调制系统[J].西北工业大学学报,2007,25(3):446-450. |
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| 作者姓名： | 胡锦涛 王永生 周奋 |
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| 作者单位： | 西北工业大学,电子信息学院,陕西,西安,710072 |
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| 摘 要： | 为了改善OFDM系统的误码性能,研究了具有良好度分布的非正则LDPC码的生成算法,提出了一种基于非正则LDPC编码的OFDM高阶调制系统。仿真结果表明了基于非正则LDPC编码OFDM高阶调制系统具有良好的误比特率和误帧率特性。和无编码OFDM系统相比,非正则LDPC编码的OFDM系统采用QPSK及16-QAM调制时,在AWGN信道下,当误比特率(BER)为1-0 5时,分别节约7 dB和2.4 dB左右的信噪比;在R ay leigh衰落信道下,当BER为1-0 2时,分别节约9 dB和5 dB左右的信噪比。
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| 关 键 词： | 正交频分复用 LDPC码 LDPC-OFDM系统 PEG算法 |
| 文章编号： | 1000-2758（2007）03-0446-05 |
| 修稿时间： | 2006-07-07 |
On the Performance of Irregular LDPC Coded OFDM Multi-Band Modulation System |
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| Hu Jintao,Wang Yongsheng,Zhou Fen.On the Performance of Irregular LDPC Coded OFDM Multi-Band Modulation System[J].Journal of Northwestern Polytechnical University,2007,25(3):446-450. |
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| Authors: | Hu Jintao Wang Yongsheng Zhou Fen |
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| Abstract: | To satisfy the increasing demand of wireless communications,a low density parity check(LDPC) coded orthogonal frequency division multiplexing(OFDM) system was proposed in this paper.The progressive edge-growth arithmetic(PEG arithmetic) for irregular LDPC code was improved,which made it possible to construct LDPC codes with any degree distribution sequences.The decoding algorithm of LDPC-OFDM system under multi-band modulation was given.The simulation results show that,compared with uncoded OFDM system,the irregular LDPC coded OFDM system gains about 7 dB and 2.4 dB in AWGN channels with QPSK and 16-QAM at BER=10-5 respectively,and gains about 9 dB and 5 dB in Rayleigh fading channels with QPSK and 16-QAM at BER=10-2 respectively. |
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| Keywords: | Orthogonal Frequency Division Multiplexing(OFDM) low-density parity-check code(LDPC) LDPC-OFDM system PEG(progressive edge-growth) arithmetic |
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