On the transmit diversity of Time Successive SSK-BPSK system

Abstract

Space shift keying (SSK) is a single radio frequency (RF) chain multiple-input multiple-output (MIMO) technique which is an alternative for conventional multi RF chain MIMO systems to achieve high spectral efficiency. SSK uses the indices of the transmit antennas as a means of conveying information to the receiver. By using SSK and Binary Phase Shift Keying (BPSK) in successive time slots to transmit the same information symbol, transmit diversity is achieved in Time Successive SSK-BPSK (TSSB). In this paper, we analyze the effect of non-identical Rayleigh fading channel on the transmit diversity of TSSB. We derive the exact bit error rate (BER) of TSSB under non-identical Rayleigh fading channel condition. Further, asymptotic BER analysis shows that the transmit diversity order of two is achieved in TSSB when the channels are identical. When the channels are completely non-identical, asymptotic analysis shows that only receiver diversity is achieved in TSSB. Using simulation results, we substantiate the analysis.