| Rayleigh衰落信道下基于低密度校验码的自适应多级编码调制系统 |
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| 引用本文： | 吕光平,袁东风,张玉玲.Rayleigh衰落信道下基于低密度校验码的自适应多级编码调制系统[J].山东大学学报(工学版),2005,35(2):41-45. |
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| 作者姓名： | 吕光平 袁东风 张玉玲 |
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| 作者单位： | 山东大学,信息科学与工程学院,山东,济南,250100;山东大学,信息科学与工程学院,山东,济南,250100;东南大学,移动通信国家重点实验室,江苏,南京,210096 |
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| 基金项目： | 国家自然科学基金项目 (60 3 72 0 3 0 )，国家留学回国基金项目 (教外司留 [2 0 0 3 ] 40 6)，山东省自然科学基金重点项目Z2 0 0 3G0 2 ) |
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| 摘 要： | 设计了两个以低密度校验(low densityparity check ,LDPC)码作分量码的自适应多级编码调制(multilevelcod ing ,MLC)系统,研究了其在Rayleigh衰落信道中的性能.第1种自适应方案采用2种调制模式:16QAM和6 4QAM .在信道条件较差时,系统采用16QAM调制,频谱效率为2 .4bps/Hz ;在信道条件较好时,则采用6 4QAM高效调制,频谱效率为4bps/Hz .第2种自适应方案采用3种调制模式:QPSK ,16QAM和6 4QAM ,原理与第2种方案相同.通过计算机仿真得到了2种自适应MLC系统在给定的BER条件下的性能、自适应MLC系统和非自适应MLC系统的性能比较,以及2种自适应之间的对比,从而得到了一些有意义的结论
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| 关 键 词： | 自适应编码调制 多级编码 低密度校验码 Rayleigh衰落信道 |
| 文章编号： | 1672-3961(2005)02-0041-05 |
| 修稿时间： | 2004年9月18日 |
Adaptive MLC system based on LDPC codes under Rayleigh fading channel |
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| L Guang-ping,YUAN Dong-feng,ZHANG Yu-ling.Adaptive MLC system based on LDPC codes under Rayleigh fading channel[J].Journal of Shandong University of Technology,2005,35(2):41-45. |
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| Authors: | L Guang-ping YUAN Dong-feng ZHANG Yu-ling |
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| Affiliation: | Lv Guang-ping 1,YUAN Dong-feng 1,2,ZHANG Yu-ling 1 |
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| Abstract: | Two adaptive coded modulation schemes are proposed for MLC (multilevel coding) system employing LDPC (low-density parity-check) codes as component code under slowly Rayleigh fading channels. In the first adaptive scheme, we adopt two modulation modes: 16QAM and 64QAM. In poor channel conditions, the MLC system with 16QAM modulation is employed. As channel conditions improve, the MLC system with 64QAM modulation is used. In the second adaptive scheme, we adopt three modulation modes: QPSK, 16QAM and 64QAM. Through simulation, we obtain the performance of adaptive MLC under a certain BER and give the comparison between adaptive MLC system and non-adaptive MLC system, the comparison between these two adaptive schemes is also given. |
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| Keywords: | adaptive modulation and coding (AMC) multilevel coding (MLC) low-density parity-check codes (LDPC) Rayleigh fading channe |
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