Journal
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
Volume 70, Issue 10, Pages 10999-11004Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TVT.2021.3102673
Keywords
Detectors; Transforms; Indexes; Complexity theory; Time-frequency analysis; Message passing; Receivers; OTFS modulation; message passing; Gaussian approximation; Doppler frequency; time-varying channel
Categories
Funding
- Engineering and Physical Sciences Research Council [EP/Noo4558/1, EP/PO34284/1]
- Royal Society's Global Challenges Research Fund Grant
- European Research Council's Advanced Fellow Grant QuantCom [789028]
- COALESCE
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Message passing aided detectors are designed for OTFS modulated system, with a joint factor graph designed to characterize the transmit-receive relationship in the DD domain. A novel GA-MP detector, modeling a posteriori probabilities through Gaussian distributions, outperforms state-of-the-art MP detector by at least 1.5 dB at a BER of 10^(-4).
Message passing (MP) aided detectors are designed for orthogonal time frequency space (OTFS) modulated system. We first characterize the transmit-receive relationship of our OTFS-modulated system in the delay-Doppler (DD) domain by designing a joint factor graph. Based on this joint factor graph, we then conceive a joint message passing aided (JMPA) detector. Furthermore, a novel low-complexity Gaussian approximate MP (GA-MP) detector is also conceived, which models the a posteriori probabilities propagated through the proposed joint factor graph by Gaussian distributions. Finally, we demonstrate that the proposed GA-MP detector outperforms the state-of-the-art MP detector by at least 1.5 dB at a bit error ratio (BER) of 10(-4), while keeping the same complexity order.
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