rsity Four Antenna Quasi-Orthogonal Space A Full Rate, Full Diversity Four Antenna Quasi-Orthogonal Space-Time Block CodeLori A. Dalton and Costas N. Georghiades Department of Electrical Engineering Texas A&M University College Station, Texas 77843-3128 {ldalton, georghia}@ee.tamu.edu July 10, 2003Abstract We present a complex, full rate space-time block code for four transmit antennas. Using carefully tailored constellation phase rotations, we show this code achieves full diversity for specialized PSK-based constellations. The optimal receiver for the new code decouples the symbol detection problem into pairs of symbols, thus greatly reducing complexity.1IntroductionThe Alamouti code [1], remarkable for having an elegant and simple linear receiver, became a paradigm in space-time block coding (STBC). Alamouti’s idea for ……
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