Carrier Multiplexing Generalized Space Shift Keying Modulation with Low Decoding Complexity

In this paper, carrier multiplexing generalized space shift keying (CM-GSSK) transmission scheme with low decoding complexity is proposed for multiple-input multiple-output (MIMO) systems, using quadrature carriers to increase the spectral efficiency. The CM-GSSK transmission scheme allows two antennas to be active during the same time slot, where the information is conveyed only by the transmit-antenna index. In CM-GSSK transmission scheme, each antenna transmits quadrature carriers, whereas conventional generalized space shift keying (GSSK) transmits the same radio frequency carrier pulse. Unlike a traditional linear decorrelator which is designed for MIMO receiver, a low complexity linear decorrelator based decoder for CM-GSSK scheme is presented and its performance is analyzed. At the receiver, the linear decorrelator decouples the received signal, which in turn, it significantly reduces the decoding complexity. The bit error rate (BER) performance results and the complexity of the proposed low complexity decoding scheme is compared with the baseline SSK schemes to demonstrate its efficiency.