| 基于编码的OFDM系统性能仿真 |
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| 引用本文： | 唐建明,孙小霞,徐位凯.基于编码的OFDM系统性能仿真[J].重庆邮电学院学报(自然科学版),2009(3). |
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| 作者姓名： | 唐建明 孙小霞 徐位凯 |
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| 作者单位： | 重庆市机电工业校;江西景德镇高等专科学校物理与应用电子系;厦门大学通信工程系; |
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| 摘 要： | OFDM在多径衰落信道中,一些子载波由于深衰落会完全被丢失,从而影响整个系统的误码性能因此,必须将OFDM系统与信道编码结合起来以提高整系统的误码性能。构建了基于编码的OFDM仿真系统,通过仿真比较了基于LDPC码、乘积积累码(PA)和卷积码的OFDM系统在多径衰落信道下的BER性能。研究了信道块衰落长度与编码性能之间的关系,仿真结果分析表明,LDPC码和PA码在不引入交织的情况下,均可获得比引入交织的卷积码更大的性能增益,表明LDPC码和PA码在无线信道环境下具有很好的适应性。
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| 关 键 词： | 编码OFDM 乘积积累(PA)码 LDPC码 块衰落 |
Performances simulation of coded OFDM systems |
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| TANG Jian-ming,SUN Xiao-xia,XU Wei-kai.Performances simulation of coded OFDM systems[J].Journal of Chongqing University of Posts and Telecommunications(Natural Sciences Edition),2009(3). |
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| Authors: | TANG Jian-ming SUN Xiao-xia XU Wei-kai |
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| Institution: | TANG Jian-ming~1,SUN Xiao-xia~2,XU Wei-kai~3 (1.Chongqing Electrical , Mechanical School,Chongqing 402160,P.R.China,2.Department of Applied Physics , Electronics,Jindezhen Comprehensive College,Jindezhen 333000,3.Department of Communication Engineering,Xiamen University,Xiamen 361005,P.R.China) |
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| Abstract: | Some subcarriers are lost because of deep fading when orthogonal frequency division multiplexing(OFDM) applying to multipath fading channel,which influences the BER performance of the whole system.Hence,the OFDM system must be combined with the channel coding to improve the system BER performance.A coded OFDM system was built,and the BER performances of OFDM systems based on low density parity-check codes(LDPC),product accumulate(PA) codes and convolutional codes were compared by simulation.In addition,the ... |
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| Keywords: | coded-orthogonal-frequency-division-multiplexing(COFDM) product accumulate(PA) codes low density parity-check codes(LDPC) block fading |
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