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基于非正则LDPC编码的OFDM高阶调制系统

Jintao Hu,Yongsheng Wang,Fen Zhou

Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University（2007）

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Abstract
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10-5时,分别节约7 dB和2.4 dB左右的信噪比;在Rayleigh衰落信道下,当BER为10-2时,分别节约9 dB和5 dB左右的信噪比.
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Key words
LDPC-OFDM system,Low-density parity-check code (LDPC),Orthogonal Frequency Division Multiplexing (OFDM),PEG (progressive edge-growth) arithmetic
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