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Precoding-Aided Spatial Modulation with Increased Robustness to Channel Correlations

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M. Koca and H. Sari, IEEE Communications Letters, Vol. 21, No. 11, pp. 2388-2391, Nov. 2017.

 

Abstract - We present a precoding approach for spatial mod- ulation (SM) in order to increase its robustness against spatial correlations over slow fading Rayleigh channels. This approach, based on phase-rotation of the transmitted symbol according to the active transmit antenna, can be implemented without changing the power budget or needing any explicit knowledge of the channel state information at the transmitter. The optimum values of the constellation rotation angles are determined so as to minimize the asymptotic average bit-error rate (ABER). Both theoretical analysis and simulation results indicate significant performance improvements even in the case of heavily correlated transmit antennas. 

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