GENERALIZED SPATIAL MODULATION SYMBOL DESIGN FOR CORRELATED RICIAN FADING MIMO CHANNELS

Abstract

In generalized spatial modulation (GSM), information is conveyed both by the indices of multiple activated antennas and the modulation symbols they transmit. GSM includes generalized space shift keying (GSSK) and spatial modulation (SM) as special cases. In a multiple-input multiple-output (MIMO) system with correlated antennas, a large number of possible GSM symbol sets exists, and the use of a particular set affects the error performance. This problem has been addressed recently for visible light communication systems using an iterative combinatorial symbol search algorithm. This paper investigates the adaptation of the this iterative algorithm for GSM symbol design in MIMO radio frequency systems. Several approaches to calculating the inter-symbol distances are introduced. The performance of the designed GSM, GSSK, and SM symbol sets is compared. The effects of the Rician fading channel parameters and the spectral efficiency are investigated.