| 带有预编码的空时分组码设计 |
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| 引用本文： | 李颖,王新梅.带有预编码的空时分组码设计[J].西安电子科技大学学报,2004,31(1):96-101. |
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| 作者姓名： | 李颖 王新梅 |
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| 作者单位： | 西安电子科技大学计算机网络与信息安全教育部重点实验室，西安电子科技大学计算机网络与信息安全教育部重点实验室 陕西西安 710071，陕西西安 710071 |
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| 基金项目： | 国家自然科学基金委员会和香港科技局联合资助项目(60131160742)，国家自然科学基金资助项目(60272057) |
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| 摘 要： | 提出一种带有预编码的空时分组码设计方法,通过旋转信号星座图对原始L维信号向量a进行变换,并将得到的信号两两一组构成L/2个2×2信号矩阵,由两根天线依次发送出去,采用该方法可使空时分组码同时获得时间分集和空间分集.当接收端有m根接收天线时,预编码分组空时码在准静态衰落信道下获得的分集增益为Lm,是传统两天线分组空时编码系统的L/2倍.与网格空时码相比,预编码STBC在不损失性能的同时具有更低的编译码复杂度.
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| 关 键 词： | 顶籍码 空时分组码 旋转矩阵 分集增益 设计 |
| 文章编号： | 1001-2400(2004)01-0096-06 |
Design of space-time block codes with pre-coding |
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| LI Ying,WANG Xin-mei.Design of space-time block codes with pre-coding[J].Journal of Xidian University,2004,31(1):96-101. |
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| Authors: | LI Ying WANG Xin-mei |
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| Affiliation: | (Ministry of Education Key Lab. of Computer Network and Information Security, Xidian Univ., Xi'an 710071, China) |
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| Abstract: | A design method for the space-time block code (STBC) with pre-coding is proposed to utilize both space diversity and time diversity. The constellations are rotated first. Then the L-dimension signal vector a is transformed to a new vector x,which is divided into L/2 sub-vectors. These L/2 sub-vectors are used to construct the signal matrix and transmitted via two antennas one by one. When m receive antennas are fixed, the diversity achieved by the pre-coding STBC is Lm, which is L/2 times that of the traditional methods over quasi-static flat fading channels. Compared with the space-time trellis code (STTC), the Pre-coding STBC has lower complexity without performance deterioration. |
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| Keywords: | pre-coding space-time block code constellation-rotating matrix diversity gains |
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