Abstract
A high rate space-time block coded spatial modulation scheme with cyclic structure (STBC-CSM) is presented in this letter. In the proposed STBC-CSM scheme, a pair of transmit antennas are chosen out of the total transmit antennas to send Alamouti's STBC, whose two signal symbols are drawn from two different constellations, and the antenna pairs activated in different codewords are moving cyclically along the total transmit antenna array. To exploit the diversity advantage of Alamouti's STBC, the optimization of STBC-CSM is given by maximizing its coding gain. Moreover, the proposed scheme allows for a low-complexity maximum-likelihood (ML) detector due to the orthogonality of Alamouti's STBC. The simulation results verify our theoretical analysis and demonstrate the performance advantages of our proposed STBC-CSM over the existing schemes such as STBC-SM, H-STBC-SM, CIOD-SM-H and SM.
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