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The explosive increase of mobile data services and the use of smart phones require the fifth generation (5G) network to support higher spectral efficiency, higher energy efficiency, and higher mobility. The currently employed modulation techniques based on the multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) paradigm unfortunately fail to satisfy this requirement. The MIMO modulation achieves high spectral efficiency for a configuration of massive antennas, but brings about unsatisfactory energy efficiency due to scalable power consumption of radio frequency (RF) chains. The OFDM modulation is prone to intercarrier interference caused by Doppler effects and suffers from high peak-to-average power ratio (PAPR). New groundbreaking modulation technologies are therefore very demanding. The recently emerging index modulation techniques provide a breakthrough to the …