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Media type:
E-Article
Title:
A Novel Double-Sided Pulse Interval Modulation (DS-PIM) Aided SIM-OFDM for 6G Light Fidelity (LiFi) Networks
Contributor:
Khan, Faisal;
Umrani, Fahim;
Baqai, Attiya;
Ijaz, Muhammad
Published:
MDPI AG, 2022
Published in:
Electronics, 11 (2022) 21, Seite 3579
Language:
English
DOI:
10.3390/electronics11213579
ISSN:
2079-9292
Origination:
Footnote:
Description:
Subcarrier Index Modulation is an OFDM variant that provides superior power and bandwidth efficiency. In this paper, we present a novel, double-sided pulse interval modulation (DS-PIM)-based SIM OFDM technique. The proposed technique exploits the variable symbol size of DPIM to provide a variable sub-block size and enable dynamic assignment of subcarriers rather than the fixed size of conventional SIM OFDM. In comparison with conventional Subcarrier Index-Modulated OFDM (SIM-OFDM), the proposed approach shows a 12.5% reduction in bandwidth usage for a 2-bit index word. On average, 3.5 subcarriers are employed by the proposed technique per sub-block, in comparison with 4 subcarriers for the conventional technique. The proposed technique provides a superior spectral efficiency compared with conventional SIM-OFDM, even for higher-order modulation.