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In this letter, accurate performance analysis of wireless communication system adopting Space Shift Keying (SSK) modulation scheme is introduced. More specifically, the performance of SSK system consisting of NT transmit and NR receive antennas with Maximum-Likelihood (ML) detection and imperfect Channel State Information (CSI) at the receiver is studied. The exact Average Bit Error Probability (ABEP) over Rayleigh fading channels is obtained in closed-form for NT=2 and arbitrary NR; while union upper bound is used to compute the ABEP when NT>;2 and arbitrary NR. Furthermore, simple and general asymptotic expression for the ABEP is derived and analyzed. Numerical results are also provided, sustained by simulations which corroborate the exactness of the theoretical analysis.