Improved Generalized Space-Shift Keying via Power Allocation

We investigate the power allocation in generalized space-shift keying (GSSK) multiple-input-multiple-output (MIMO) systems. The maximum-likelihood detection with full channel state information (CSI) at the receiver is considered. The goal of the design is to allocate transmit power on GSSK antennas to minimize the symbol error rate (SER) under the total power constraint. An upper bound of SER conditioned on CSI is presented. We propose an algorithm, called the Euclidean distance-based power allocation scheme, to minimize the SER upper bound. Simulation results demonstrate the performance superiority in the proposed scheme compared with prior space-shift-keying-type schemes and the conventional MIMO schemes.