空时编码技术研究与分析

Space-Time Code is a useful code which can make information capacity approach the theoretic capacity in MOMO information channels. Generalized Space-Time Code Technology includes various technologies involving transmitting diversity technology and space reuse technology. This paper introduces three kinds of Space-Time Code Technology, including Space-Time Trellis Code, Layered Space-Time Code and Space-Time Block Code. Space-Time Trellis Code can overcome fading effect effectively with its composite design which covers Error-controlled Code, modulating, sending and receiving; Layered Space-Time Code can achieve transmit diversity as this kind of coding technology has decomposed high rate data operation into many low rate data operations before encoding through general parallel encoder and then sends adjusted signals through antennas after parallel layered coding. This paper mainly does research on Space-Time Block Code. Alamouti project is the first Space-Time Block Code provided for system of 2 transmit antennas with full transmitting diversity gain and it is the sole project based on full rate and full diversity coding project to complicated signals. The paper depicts Alamouti encoding and decoding project detailedly and exhibits simulation result given out by computer together with corresponding analysis.