The Analysis of Space-Time Block Code for Four Transmit Antennas Over Time-Varying Fading Channels

• Main Authors: Ho-Yo Chiang, 江厚滺
• Other Authors: Tsang-Ming Wu
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/51718884118980935553

碩士 === 中原大學 === 電機工程研究所 === 96 === In this paper, we propose an implementation of channel-orthogonalized space-time block code(CO-STBC) over time-varying flat-fading channels. When signal modulation is complex constellation, CO-STBC can achieve both the orthogonal property of simple decoding algorithm and the rate one of the maximum data transmission. Its SER performance is better than the others. But the previous STBC decoding algorithms are obtained under the assumption of quasi-static flat-fading channels. The complexity of MLD decoding algorithm is increasing too much to change simple linear one and its SER performance is worse because of not perfect channel estimation, so we propose a simpler and the most closed MLD receiver design method. First we use pilot-symbol-assisted modulation(PSAM) to put pilot symbols periodically for channel estimation in order to decrease the error of the channel gains. Second at the received end, we design the phase estimator generates proper phase value to sustain the orthogonality of the CO-STBC, then we depend the mathematical method to design the interference cancellation(IC) detector to detect the transmitted symbol. Finally we simulate the overall communication system by C++ programming language and MATLAB and will find the design method proposed in this paper is the most closed MLD and the BER is better than the one of the Alamouti code over time-varying flat-fading channels.