MIMO正交空时分组码技术

Orthogonal Space-Time Block Coding(OSTBC) for MIMO Systems

对编码分集在MIMO系统中应用做详细的介绍,编码分集选取了正交空时分组码的编码结构和基于线性接收的最大似然译码准则。主要探讨了包括Alamouti空时码,3发射天线和4发射天线在内的正交空时分组码。还介绍了一种基于并行Alamouti编码的新的分集传输方案,该方案的编码性能和Alamouti码相似,它的优势在于大大简化了MIMO系统的改造复杂度。最后,通过仿真这几种空时编码并详细分析了在不同调制模式下的误比特性能。

This paper is detailed in the study for diversity coding in MIMO systems.Here,the orthogonal structure of the space-time block code and a maximum-likelihood decoding algorithm which is based only on linear processing at the receiver are introduced.Different space-time block coding（STBC） schemes including Alamouti STBC as well as orthogonal STBC for 3 and 4 transmit antennas are explored.We present a new transmit strategy based on parallel Alamouti codes for the simple two branch transmit diversity scheme.The proposed encoding scheme can significantly simplify the processes of transforming SISO into MIMO in wireless communication systems,its coding gain is similar to Alamouti code.Finally,comparisons with these STBC implementations are also provided and analyzed for performance according to their bit-error rates using diversified modulation schemes.