Generalised Space-Delay-Doppler Index Modulated OTFS Transmission

Abstract

Recently, index modulated orthogonal time frequency space modulation with multi-input and multi-output (MIMO-OTFS) has been introduced to achieve better bit error rate (BER) performance than conventional MIMO-OTFS. To further utilize the multi-domain resources, in this paper, we present a transmission scheme called generalized space-delay-Doppler index modulated OTFS (GSDDIM-OTFS) to explore the potential advantages of the high dimensional index modulation, in which additional information bits are carried through the combined space-delay-Doppler resource units. Furthermore, the analytical expressions of average bit error probability (ABEP) are derived to evaluate the performance of the proposed scheme. Simulation results demonstrate the enhanced performance of the proposed scheme over doubly-selective fading channels.