| 一种改进的差分空时频编码OFDM系统设计 |
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| 引用本文： | 刘伟,崔卫国,胡娥梅.一种改进的差分空时频编码OFDM系统设计[J].通信技术,2008,41(7). |
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| 作者姓名： | 刘伟 崔卫国 胡娥梅 |
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| 作者单位： | 河南科技大学电子信息工程学院,河南洛阳,471003 |
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| 摘 要： | 平滑逻辑信道子载波排序和子载波删除可以提高差分空频编码OFDM的性能,但是导致系统频谱利用率的下降.文中提出一种改进的差分空时频编码的方案,在一个OFDM符号内采用平滑逻辑信道进行空频编码,对于删除的子载波在相邻的OFDM符号间进行差分空时编码.研究结果表明,这种改进的空时频编码OFDM系统和平滑逻辑信道空时编码OFDM系统对比提高了频谱利用率,而没有明显的性能损失.
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| 关 键 词： | 空时编码 正交频分复用 差分空时频编码 平滑逻辑信道 改进 差分 空时频编码 OFDM System 系统设计 Improved 性能损失 结果 研究 空时编码 符号 方案 频谱利用率 空频编码 删除 排序 子载波 逻辑信道 平滑 |
Design on Improved Differentially Space-Time-Frequency Coded OFDM System |
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| LIU Wei,CUI Wei-guo,HU E-mei.Design on Improved Differentially Space-Time-Frequency Coded OFDM System[J].Communications Technology,2008,41(7). |
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| Authors: | LIU Wei CUI Wei-guo HU E-mei |
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| Institution: | LIU Wei,CUI Wei-guo,HU E-mei (School of Electronic Information Engineering,Henan University of Science , Technology,Luoyang Henan 471003,China) |
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| Abstract: | A smooth logical channel is an efficient method to improve the performance of differentially space-frequency coded orthogonal frequency division multiplexing (OFDM) by re-sorting subcarriers and pruning subcarriers. However, it reduces the spectrum utilization of the space-frequency coded OFDM systems. An improved differentially space-time-frequency coded OFDM method is presented in this paper. The space-frequency coding over smooth logocal channel is implemented within per OFDM symbol and the differentiall... |
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| Keywords: | space-time coding OFDM differential space-time-frequency coding smooth logical channel |
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