[CUl17] Grouped Linear Constellation-Precoding for Subcarrier Index Modulation OFDM

Conférence Internationale avec comité de lecture : International Conference on Wireless Communication and Systems (ISWCS 2017), August 2017, pp.1-6, Bologna, Italia,

Mots clés: orthogonal frequency-division multiplexing, index modulation, 5G

Résumé: The use of index modulation (IM) in orthogonal frequency-division multiplexing (OFDM) systems, as a way to improve the spectral efficiency and/or improve the error performance, has received increasing attention in the last few years. The so-called subcarrier index modulation (OFDM-SIM) is currently among the signal processing techniques candidates for the future 5G wireless networks. Most of the works consider the splitting of the subcarriers into groups. Within each group, part of the information is carried by an index associated with a selection of active subcarriers. Extra information can thus be conveyed while obtaining some energy savings steaming from the silent (inactive) subcarriers. The use of interleavers is crucial to obtain good performance in low SNR regions for SIM schemes. Other techniques such as grouped linear constellation-precoding (GLCP) have been applied to OFDM with grouped subcarriers to further improve the error performance. In this paper, we propose to combine SIM and GLCP in a same scheme, called GLCPSIM- OFDM, as an alternative for the well-known interleaved SIM (OFDM-ISIM). An interleaving at real dimensions level and rotations for the schemes without or with GLCP are also proposed, in such a way that for the last case the full signal space diversity can be achieved. The good performance and the diversity gains are shown both through computer simulations and analysis.

Collaboration: lcs


@inproceedings {
title="{Grouped Linear Constellation-Precoding for Subcarrier Index Modulation OFDM}",
author=" J. Camilo Inacio and B. Uchoa-Filho and D. le Ruyet ",
booktitle="{International Conference on Wireless Communication and Systems (ISWCS 2017)}",
address="Bologna, Italia",