A novel delay-doppler-based channel estimation method in doubly-dispersive ocdm systems
Künye
Zegrar, S. E. ve Arslan, H. (2024). A novel delay-doppler-based channel estimation method in doubly-dispersive ocdm systems. IEEE Wireless Communications Letters, 13(3), 801-804. http://dx.doi.org/10.1109/LWC.2023.3344231Özet
Orthogonal chirp division multiplexing (OCDM) has recently emerged as a new candidate for the 6G waveform. In high-mobility wireless channels, the inseparability of the data symbols in both time and frequency domains makes channel estimation in OCDM-based wireless communication quite challenging. In this letter, we address this issue by investigating the representation of the OCDM waveform in the delay-Doppler domain in which we reveal that OCDM carriers exhibit a sparse representation. Building upon this observation, we propose a low-complexity channel estimation technique for OCDM systems. This technique involves designing pilots in the Fresnel domain and estimating the channel in the delay-Doppler domain. We evaluate the performance of the proposed channel estimation and demonstrate the superior performance of our approach, showcasing both high accuracy and low computational complexity.
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IEEE Wireless Communications LettersCilt
13Sayı
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