Spatial modulation with joint antenna index and symbol index turbo trellis coding

Abstract

In this article, we introduce a new spatial modulation (SM) transmission scheme using turbo trellis coding (TTC) for both antenna and symbol indexes. In spatial modulation scheme with trellis coding (SM-TC) the transmitter encodes the information bits before selecting the transmit antenna and transmitted symbol indexes. The SM-TC scheme is a generalization of the turbo trellis coded SM (TTCSM) scheme, which encodes just the information bits used to select the transmit antenna index. The performances of the SM-TC scheme can be considerably enhanced by using parallel concatenated turbo coding. The new SM-TTC scheme combines the SM-TC transmission with conventional parallel turbo trellis-coded modulation (TTCM). The bit error rate (BER) performances are evaluated using simulations for PSK-SM-TTC transmissions over stationary Rayleigh, Rician, and spatially correlated (SC) fading channels with additive white Gaussian noise (AWGN). Simulation results reveal that the SM-TTC scheme performs better than the previous TTCSM scheme when transmitting over a SC fading channel, especially for a large number of receive antennas.