Research Article
Look-up Table Reduction for Subcarrier Activation in OFDM with Index Modulation Systems
@INPROCEEDINGS{10.4108/eai.7-9-2021.2314821, author={Abdulrahman Ikram Siddiq and Hussein Nadhem Fadhel}, title={Look-up Table Reduction for Subcarrier Activation in OFDM with Index Modulation Systems}, proceedings={Proceedings of 2nd International Multi-Disciplinary Conference Theme: Integrated Sciences and Technologies, IMDC-IST 2021, 7-9 September 2021, Sakarya, Turkey}, publisher={EAI}, proceedings_a={IMDC-IST}, year={2022}, month={1}, keywords={orthogonal frequency division multiplexing subcarrier index modulation subcarrier encoding subcarrier activation pattern}, doi={10.4108/eai.7-9-2021.2314821} }- Abdulrahman Ikram Siddiq
Hussein Nadhem Fadhel
Year: 2022
Look-up Table Reduction for Subcarrier Activation in OFDM with Index Modulation Systems
IMDC-IST
EAI
DOI: 10.4108/eai.7-9-2021.2314821
Abstract
Orthogonal frequency division multiplexing with index modulation (OFDM-IM) is a promising multi-carrier communication technique. A limited set of k out of n available subcarriers are activated and modulated by constellation symbols. The selection of the subcarrier activation pattern is performed according to data mapped via Look-up Tables (LUTs) or equivalent iterative mathematical algorithms. The complexity of mapping data to active subcarrier indices can rise dramatically with n, and then limit the applicability of OFDM-IM. Therefore, in this paper, a new subcarrier activation scheme is proposed, where smaller size LUTs are used. A reduction ratio in LUT overall size of about 84% is achieved for (n,k)=(8,4), and this ratio increases with n. The presented analysis and simulation show that an OFDM-IM exploiting the proposed scheme is an identical less complex version of classical OFDM-IM, with a very close BER performance.