Two kinds of modifiedcodewords for space-time block coded spatial modulation (STBC-SM) are presented in this study. The first modifiedcodeword introduces a concept of flexible coefficients into the M-ary phase shift...
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Two kinds of modifiedcodewords for space-time block coded spatial modulation (STBC-SM) are presented in this study. The first modifiedcodeword introduces a concept of flexible coefficients into the M-ary phase shift keying STBC-SM. A method is proposed to obtain the optimal flexible coefficients. Moreover, the first modifiedcodewords can also be applied to the systems developed from the STBC-SM. In the second provided codewords, super-orthogonal space-time trellis codes are applied in STBC-SM. Therefore, a higher spectral efficiency is obtained compared with the original STBC-SM. Finally, the simulation results and theoretical analysis demonstrate these performance advantages of the two kinds of modifiedcodewords for STBC-SM.
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