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.
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.
出处
《西安电子科技大学学报》
EI
CAS
CSCD
北大核心
2004年第1期96-101,共6页
Journal of Xidian University
基金
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)
关键词
顶籍码
空时分组码
旋转矩阵
分集增益
设计
pre-coding
space-time block code
constellation-rotating matrix
diversity gains
