| 一种基于自适应调制的LDPC-COFDM系统性能研究 |
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| 引用本文： | 贾治华,邓建国,田丰.一种基于自适应调制的LDPC-COFDM系统性能研究[J].电路与系统学报,2005,10(3):136-139. |
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| 作者姓名： | 贾治华 邓建国 田丰 |
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| 作者单位： | 西安交通大学,电子与信息工程学院,陕西,西安,710049 |
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| 摘 要： | 本文研究了一种基于自适应调制和软解调算法的LDPC-COFDM(LDPC Coded OFDM)系统模型，该自适应调制方案根据各个了信道的信道增益来自适应地分配比特。文中对自适应调制和软解调算法进行了讨论和分析，最后给出了仿真结果。仿真结果表明，基于自适应调制的LDPC-COFDM能够有效提高系统的误码性能，适应多径衰落信道的时变特性。
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| 关 键 词： | 正交频分复用 低密度奇偶校验码 自适应调制 软解调 |
| 文章编号： | 1007-0249(2005)03-0136-04 |
| 修稿时间： | 2005年1月10日 |
Performance of Low-Density Parity-Check (LDPC) Coded OFDM system based on adaptive modulation |
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| JIA Zhi-hua,DENG Jian-guo,TIAN Feng.Performance of Low-Density Parity-Check (LDPC) Coded OFDM system based on adaptive modulation[J].Journal of Circuits and Systems,2005,10(3):136-139. |
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| Authors: | JIA Zhi-hua DENG Jian-guo TIAN Feng |
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| Abstract: | A LDPC-COFDM system model, which based on adaptive modulation and soft demodulation, was analyzed. The system allocates the bits according to the channel gain of each sub-channel adaptively. The adaptive modulation and the soft demodulation algorithms were discussed and the simulation results were presented. The simulation results show that the model can effectively improve the bit-error-rate performance of the system, adapting to the time-variant behavior of the multipath fading channel. |
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| Keywords: | OFDM LDPC (Low-Density Parity-Check) codes adaptive modulation soft demodulation |
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