Spread OFDM-IM with precoding matrix and low-complexity detection designs

Thien Van Luong, Youngwook Ko

Research output: Contribution to journalArticle

10 Citations (Scopus)
194 Downloads (Pure)

Abstract

We propose a new spread Orthogonal Frequency Division Multiplexing with Index Modulation (S-OFDM-IM), which employs precoding matrices such as Walsh-Hadamard (WH) and Zadoff-Chu (ZC) to spread both non-zero data symbols of active sub-carriers and their indices, and then compress them into all available sub-carriers. This aims to increase the transmit diversity, exploiting both multipath and index diversities. As for the performance analysis, we derive the bit error probability (BEP) to provide an insight into the diversity and coding gains, and especially impacts of selecting various spreading matrices on these gains. This interestingly reveals an opportunity of using rotated versions of original WH and ZC matrices to further improve the BEP performance. More specifically, rotated matrices can enable S-OFDM-IM to harvest the maximum diversity gain which is the number of sub-carriers, while benchmark schemes have diversity gains limited by two. Moreover, we propose three low-complexity detectors, namely minimum mean square error log-likelihood ratio (MMSE-LLR), index pattern MMSE (IPMMSE), and enhanced IP-MMSE, which achieve different levels of complexity and reliability. Simulation results are presented to prove the superiority of S-OFDM-IM over the benchmarks.
Original languageEnglish
Pages (from-to)11619 - 11626
JournalIEEE Transactions on Vehicular Technology
Volume67
Issue number12
DOIs
Publication statusPublished - 01 Oct 2018

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  • Student Theses

    Reliable and Low-Complexity Multicarrier Systems

    Author: Luong, T. V., Jul 2020

    Supervisor: Ko, Y. (Supervisor) & Matthaiou, M. (Supervisor)

    Student thesis: Doctoral ThesisDoctor of Philosophy

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