Space-Time Index Modulation
Swaroop Jacob, T. Lakshmi Narasimhan, and A. Chockalingam

TL;DR
This paper introduces space-time index modulation (STIM), a novel multi-antenna scheme that encodes information through antenna and slot indexing along with traditional symbols, improving spectral efficiency and performance in frequency-selective channels.
Contribution
The paper proposes a new modulation scheme, STIM, combining spatial, temporal, and symbol indexing, with analysis and low-complexity detection algorithms for frequency-selective fading channels.
Findings
STIM outperforms OFDM at the same spectral efficiency.
Low-complexity iterative detection algorithms are developed.
STIM demonstrates improved performance in frequency-selective channels.
Abstract
In this paper, we present a new multi-antenna modulation scheme, termed as {\em space-time index modulation (STIM)}. In STIM, information bits are conveyed through antenna indexing in the spatial domain, slot indexing in the time domain, and -ary modulation symbols. A time slot in a given frame can be used or unused, and the choice of the slots used for transmission conveys slot index bits. In addition, antenna index bits are conveyed in every used time slot by activating one among the available antennas. -ary symbols are sent on the active antenna in a used time slot. We study STIM in a cyclic-prefixed single-carrier (CPSC) system in frequency-selective fading channels. It is shown that, for the same spectral efficiency, STIM can achieve better performance compared to conventional orthogonal frequency division multiplexing (OFDM). Low-complexity iterative algorithms for the…
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Taxonomy
TopicsAdvanced Wireless Communication Technologies · IoT Networks and Protocols · Optical Wireless Communication Technologies
