Journal
IEEE WIRELESS COMMUNICATIONS LETTERS
Volume 10, Issue 5, Pages 991-995Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LWC.2021.3053981
Keywords
Indexes; Detectors; Modulation; OFDM; Time-frequency analysis; Table lookup; Delays; OTFS; dual-mode index modulation; OTFS-DM-IM; modified log-likelihood ratio detector
Categories
Funding
- National Key Research and Development Program of China [2020YFB1807900]
- Postdoctoral Science Foundation of China [2020M670332]
- National Natural Science Foundation of China [61471037]
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A new transmission scheme OTFS-DM-IM is proposed to balance transmission reliability and spectral efficiency, with a modified log-likelihood ratio detector based on minimum Hamming distance. Simulation results show the performance advantage of OTFS-DM-IM over classical OTFS and OTFS systems based on index modulation.
Orthogonal time frequency space (OTFS) modulation has been proved to have better bit error rate (BER) performance over orthogonal frequency division multiplexing (OFDM) under high-mobility conditions. In this letter, a new transmission scheme, called OTFS with dual-mode index modulation (OTFS-DM-IM), is proposed to balance the transmission reliability and spectral efficiency. Moreover, a modified log-likelihood ratio (LLR) detector based on the minimum Hamming distance is designed for demodulation. Then, the theoretical BER analysis of the proposed OTFS-DM-IM is presented. Simulation results highlight the performance advantage of OTFS-DM-IM over classical OTFS and the existing OTFS systems based on index modulation (OTFS-IM), and also confirm the superiority of the modified LLR detector compared to maximum likelihood detector and conventional LLR detector.
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