| 利于LDPC码对数似然比译码的自适应功率分配算法 |
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| 引用本文： | 吴晓光,张治,邓钢,张平. 利于LDPC码对数似然比译码的自适应功率分配算法[J]. 北京邮电大学学报, 2007, 29(2): 102-105 |
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| 作者姓名： | 吴晓光 张治 邓钢 张平 |
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| 作者单位： | 北京邮电大学,电信工程学院,北京,100876 |
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| 摘 要： | 提出了一种在低密度奇偶校验码(LDPC)编码的正交频分复用 (OFDM)系统中，利于各子载波进行LDPC码对数似然比译码的自适应功率分配算法，根据信道条件调整各子载波的功率，使系统的译码性能达到最优。给出了该算法在多径衰落信道下的仿真，仿真结果表明，自适应预处理算法对系统的误比特性能有了很大程度的提高。
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| 关 键 词： | 低密度奇偶校验码 正交频分复用 对数似然比译码 自适应 |
| 文章编号： | 1007-5321（2007）02-0102-04 |
| 收稿时间： | 2006-05-28 |
| 修稿时间： | 2006-05-28 |
Adaptive Algorithm Based on Log Likelihood Ratio Decoding of LDPC Coded Modulation |
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| WU Xiao-guang,ZHANG Zhi,DENG Gang,ZHANG Ping. Adaptive Algorithm Based on Log Likelihood Ratio Decoding of LDPC Coded Modulation[J]. Journal of Beijing University of Posts and Telecommunications, 2007, 29(2): 102-105 |
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| Authors: | WU Xiao-guang ZHANG Zhi DENG Gang ZHANG Ping |
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| Affiliation: | (School of Telecommunication Engineering, Beijing University of Posts and Telecommunications, Beijing 100087, China)
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| Abstract: | For beneficial of log likelihood ratio decoding of low-density parity-check(LDPC) coded modulation,an adaptive power allocation algorithm is proposed in orthogonal frequency division multiplexing(OFDM) systems.The transmit power allocated to sub-carriers is adjusted according to the channel gain of each sub-channel to optimize the decoding performance.Simulation results show that the algorithm can effectively improve the bit-error-rate performance of the system,adapting to the time-variant behavior of the multi-path fading channel. |
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| Keywords: | low-density parity-check orthogonal frequency division multiplexing log likelihood ratio decoding adaptive algorithm |
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