一种基于旋转变换和正交设计的满分集空时频编码技术  

A Full-diversity Space-time-frequency Code Technology Based on Rotation Transformation and Orthogonal Design

作　　者：王东锋[1] 周兴建[2] 王建英[1] 王春蓉 

机构地区：[1]西南交通大学信息科学与技术学院,成都610031 [2]中国西南电子技术研究所,成都610036 [3]空军驻电子十所军事代表室,成都610036

出　　处：《电讯技术》2008年第11期65-70,共6页Telecommunication Engineering

摘　　要：为了在MIMO—OFDM系统中更好地获得空间、时间和频率三维分集增益及较高编码增益，设计了一种最大码元速率为1的改进空时频编码技术。编码过程中，首先对两组发射数据向量进行旋转，然后以两天线为一组对旋转后的数据流在连续的两个OFDM符号之间进行正交设计，并按一定的准则分配到不同的子载波上，从而获得满分集增益和最优化编码增益。译码时，先将接收信号进行线性合并和白化处理，然后利用复杂度较低的球形译码器实现最大似然译码。分别对两发两收和四发一收系统进行仿真，结果表明，改进的编码技术与同样可获得满分集增益的空频码相比，具有0．5～0．6dB的性能增益，因此具有更高的应用价值。In order to obtain maximum coding gain and full diversity gain in space, time and frequency for MIMO - OFDM systems, an improved rate - one space - time - frequency code is presented. The data streams are first rotated by an algebraic rotation matrix, and then designed orthogonally every two antennas in two OFDM blocks. Finally, the lower complexity sphere - decoding algorithm is used to perform the maximum - likelihood decoding algorithm after linear combination and whitened processing. Some code with 2 × 2 system and 4 × 1 system are simulated, the results show that the improved space - time - frequency code has 0.5 - 0.6dB of gain over the existing space - frequency codes, so it has wide applications.

关 键 词：MIMO—OFDM 空时频编码 旋转变换 正交设计 球形译码算法 

分 类 号：TN919.3[电子电信—通信与信息系统]