Subcarrier-Interactive Dual-Mode OFDM
IEEE Communications Letters, vol.27, no.5, pp.1472-1476, 2023 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 27 Issue: 5
- Publication Date: 2023
- Doi Number: 10.1109/lcomm.2023.3248523
- Journal Name: IEEE Communications Letters
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, PASCAL, Aerospace Database, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
- Page Numbers: pp.1472-1476
- Keywords: dual-mode, index modulation (IM), log-likelihood ratio (LLR), maximum-likelihood (ML), OFDM
- Yozgat Bozok University Affiliated: Yes
Abstract
In this letter, a novel dual-mode index modulation aided orthogonal frequency division multiplexing (DM-OFDM) scheme called subcarrier-interactive (SI-) DM-OFDM is proposed. In the SIDM-OFDM, each subcarrier pair conveys the same QAM modulated symbols to achieve a diversity gain. At the receiver, a low complexity (LC) signal detection algorithm is proposed, i.e., SIDM-OFDM-LC, where each subcarrier interacts with other subcarriers in the same subblock as complementary and non-complementary states to improve BER performance. Moreover, Euclidean distance (ED) of the received signal and channel-noise matrix (CNM) based signal detection algorithms are employed for demodulation, namely SIDM-OFDM-ED and SIDM-OFDM-CNM, respectively. Simulation results confirm that the SIDM-OFDM with the proposed three signal detection algorithms achieves a significantly better BER performance than the existing DM-OFDM scheme at the same spectral efficiency. Also, it is revealed that the SIDM-OFDM-LC reduces the signal detection cost compared to the other two proposed detectors.