Exploiting Entire GSSK Antenna Combinations in MIMO Systems

We propose to improve the spatial efficiency and lower the symbol error rate (SER) of generalized space shift keying (GSSK) modulation through exploiting the entire antenna combinations. Conventional GSSK modulation bridges the binary sequence to the usually non-power-of-two antenna combinations through fixed one-on-one mapping which very often renders a great proportion of antenna combinations unused. In this paper, we design an unequal rate encoding (URE) scheme to exploit entire GSSK antenna combinations with different rate pre-mapping encoders to achieve the spatial efficiency. Without degrading transmission rates, an URE scheme improves SER with low decoding complexity in GSSK MIMO systems.