Generalised space shift keying for visible light communications

In this paper a low complexity, multiple transmitter generalised space shift keying (GSSK) signalling technique for optical wireless communication system is introduced. In an N_t transmitter system, this signalling technique is capable of achieving a spectral efficiency of N_t bits/s/Hz. In visible light communication (VLC) applications, dimming control can be accomplished by varying the duty cycle of the tranmsitted pulse. The bit error rate results for N_t = [2, 3] is also presented and the effect of channel gains on error performance highlighted. The error performance depends on the transmitter´s individual channel gains as well as the difference in the channel gains between any pair of transmitters.