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摘要为了改善正交频分复用(orthogonal frequency division multiplexing, OFDM)在稀疏多径信道环境中的抗衰落能力,提出一种基于星座旋转调制OFDM系统的自适应交织方法。利用OFDM系统的多载波特点将旋转调制中的分量交织引入到子载波间交织,根据统计信道状态信息或实时信道状态信息,采用该文设计的交织器搜索准则来选取最佳分量交织图案,接收端将最佳的分量交织图案的索引反馈给发送端,实现了自适应交织。仿真结果表明该方法在稀疏多径衰落信道下有优异的抗衰落性能和较高的频谱利用率。
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| 关键词 ：正交频分复用(OFDM),旋转调制,信号空间分集,自适应交织,衰落信道 |
Abstract：An adaptive interleaving method was designed for rotated-modulation (orthogonal frequency division multiplexing, OFDM) systems to improve the anti-fading in OFDM systems in sparse multipath channels. The multiple carriers in OFDM are used to add component interleaving into the sub-carrier interleaving using statistical or real channel state information. The interleaver search criterion was designed to select the best component interleaving map. The receiver uses the criterion to search for the best component interleaving and then feeds the map index back to the sending end for adaptive interleaving. Simulations show that this method has excellent anti-fading performance and is bandwidth-efficient in sparse multipath fading channels.
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| Key words：orthogonal frequency division multiplexing (OFDM)rotated-modulationsignal space diversityadaptive interleavingfading channel |
| 收稿日期: 2013-10-28 出版日期: 2015-04-17 |
| 基金资助:国家“九七三”重点基础研究发展计划(2012CB316000);国家“八六三”高技术项目(2012AA01A502);国家科技重大专项(20122X03001017-002) |
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