Iterative Combinatorial Symbol Design for Spatial Modulations in MIMO VLC Systems

This letter presents an iterative combinatorial symbol design algorithm for the generalized spatial modulation (GSM) in visible light communication systems. An approach that is fundamentally different from the available low complexity design methods is adopted by jointly considering both spatial and intensity bits in the symbol design. The proposed method is compared against existing symbol design methods for both photodiode array and camera receivers in terms of error performance and implementation complexity. The algorithm is shown to outperform several GSM symbol design methods, providing many decibels of performance gain. The proposed algorithm is also applicable to generalized space-shift keying and spatial modulation.