Space Shift Keying (SSK—) MIMO over Correlated Rician Fading Channels: Performance Analysis And a New Method for Transmit-Diversity

Abstract

In this paper, we study the performance of Space Shift Keying (SSK) modulation for a generic Multiple—Input—Multiple—Output (MIMO) wireless system over correlated Rician fading channels. In particular, our contribution is twofold. i) First, we propose a very general framework for computing the Average Bit Error Probability (ABEP) of SSK—MIMO systems over a generic Rician fading channel with arbitrary correlation and channel parameters. The framework relies upon the Moschopoulos method. We show that it is exact for MIMO systems with two transmit—antenna and arbitrary receive—antenna, while an asymptotically—tight upper—bound is proposed to handle the system setup with an arbitrary number of transmit—antenna. ii) Second, moving from the consideration that conventional SSK—MIMO schemes can offer only receive—diversity gains, we propose a novel SSK—MIMO scheme that can exploit the transmit—antenna to increase the diversity order. The new method has its basic foundation on the transmission of signals with good time—correlation properties, and is called Time—Orthogonal—Signal—Design (TOSD—) assisted SSK modulation (TOSD—SSK). It is shown that the proposed method can increase twofold the diversity order for arbitrary transmit— and receive—antenna. In particular, for MIMO systems with two transmit—antenna and N_r receive—antenna full—diversity equal to 2N_r can be achieved. Analytical frameworks and theoretical findings are substantiated via Monte Carlo simulations for various system setups.