We propose a novel spatial modulation (SM) scheme, which is a joint of two index modulation schemes. One is the M-ary spatial shift-keying (MSSK) modulation operated in the space domain, while the other one is the M-ary orthogonal shift keying (MOSK) modulation, which usually requires more bandwidth to implement, when its modulation level increases. As both MSSK and MOSK belong to the energy-efficient modulation schemes, the joint MSSK-MOSK modulation is energy-efficient, which is suitable for providing reliable communications in low signal to noise ratio (SNR) region. We also propose two approaches for detection of the MSSK-MOSK signals. The first approach is the joint maximum likelihood detection (MLD), which simultaneously detects the component MSSK symbol and MOSK symbol in MLD principle. The second approach is the successive MLD, which first detects the component MOSK symbol using non-coherent MLD, and then the component MSSK symbol using coherent MLD. Finally, we investigate the error performance of the MSSK-MOSK modulation, when assuming communications over flat Rayleigh fading channels with receiver diversity. Our studies demonstrate that the joint MLD slightly outperforms the successive MLD, but requires much higher complexity for implementation. With the resources provided from both the space and frequency domains, the MSSK-MOSK with high modulation levels may be readily implemented, which makes it is possible to provide reliable communications at very low energy consumption, even when the low-complexity successive MLD is employed.
Joint Space-Shift Keying and Orthogonal Shift-Keying Modulation for Energy-Efficient Signal Transmission
2016-05-01
195537 byte
Conference paper
Electronic Resource
English
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