Non-Binary Turbo Coded Spatial Modulation

Non-binary symbol transmission such as Ternary Phase Shift Keying (TPSK) and Hexagonal Quadrature Amplitude Modulation (HQAM) can achieve the superior performance to the PSK or square QAM in the band-limited and peak-to-average power ratio (PAPR) limited channel due to its excellent natures of PAPR, spurious characteristic, and minimum Euclidean distance. However, these non-binary symbol transmissions are not suitable for the transmission of binary information, because there is mapping loss in the bit-to-symbol mapping due to non-power-of-two number of constellation points. The aim of this work is to alleviate its loss by using spatial modulation and then improve the bit-error performance. Spatial modulation has been proposed as a spatial domain modulation, which can efficiently work only in the case of power-of-two number of antennas. By jointly desingning spatial modulation and non-binary amplitude phase modulation, the system can be more flexibly designed and then achieve better performance. Furthermore, we study the coding scheme for this non-binary symbol transmission in the PAPR limited channel. Computer simulations confirm that the proposed system with non-binary turbo code can significantly improve BER performance.