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Title: | Optimal Mapper for OFDM with Index Modulation: A Spectro-Computational Analysis | Authors: | Queiroz, Saulo Vilela, João P. Monteiro, Edmundo |
Keywords: | Computational complexity; index modulation; OFDM; signal mapping; software-de ned radio; spectral effciency | Issue Date: | 21-Feb-2020 | Publisher: | IEEE | Serial title, monograph or event: | IEEE Access | Volume: | 8 | Abstract: | In this work, we present an optimal mapper for OFDM with index modulation (OFDM-IM). By optimal we mean the mapper achieves the lowest possible asymptotic computational complexity (CC) when the spectral efficiency (SE) gain over OFDM maximizes. We propose the spectro-computational (SC) analysis to capture the trade-off between CC and SE and to demonstrate that an $N$-subcarrier OFDM-IM mapper must run in exact $\Theta(N)$ time complexity. We show that an OFDM-IM mapper running faster than such complexity cannot reach the maximal SE whereas one running slower nullifies the mapping throughput for arbitrarily large $N$. We demonstrate our theoretical findings by implementing an open-source library that supports all DSP steps to map/demap an N-subcarrier complex frequency-domain OFDM-IM symbol. Our implementation supports different index selector algorithms and is the first to enable the SE maximization while preserving the same time and space asymptotic complexities of the classic OFDM mapper. | Description: | \c{opyright} 2020 Saulo Queiroz. This work is licensed to IEEE under the Creative Commons Attribution 4.0(CC BY 4.0). The source code is licensed under GPLv2 in https://github.com/sauloqueiroz/lib-ofdmim | URI: | https://hdl.handle.net/10316/106151 | ISSN: | 2169-3536 | DOI: | 10.1109/ACCESS.2020.2986131 | Rights: | openAccess |
Appears in Collections: | I&D CISUC - Artigos em Revistas Internacionais |
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Optimal_Mapper_for_OFDM_With_Index_Modulation_A_Spectro-Computational_Analysis.pdf | 3.78 MB | Adobe PDF | View/Open |
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