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Enhanced Estimation of Channel and CFO in FBMC/OQAM via ZFBMC-Based Preamble

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Abstract

In next-generation communication systems, Filter Bank Multicarrier with Offset Quadrature Amplitude Modulation (FBMC/OQAM) has emerged as a promising alternative to Orthogonal Frequency Division Multiplexing (OFDM), offering enhanced robustness in multipath channels. However, like OFDM, FBMC/OQAM is susceptible to Carrier Frequency Offset (CFO), which can cause inter-carrier interference and performance degradation. This paper proposes a novel solution to the critical challenge of joint CFO and channel estimation in multipath fading environments. We propose a novel estimator that leverages a strategically designed training sequence within each frame's header. This sequence, comprising pilot symbols and Zero-FBMC symbols (ZFBMC), significantly improves the accuracy of joint estimation. To reduce computational complexity, we introduce an iterative algorithm based on Taylor approximation for CFO estimation. Extensive simulations demonstrate that our proposed estimators asymptotically approach the Cramer-Rao bound (CRB) for both joint CFO and channel estimation. Moreover, in scenarios with perfect CFO synchronization, our channel estimation method achieves near-optimal performance. These results underscore the effectiveness of our approach in enhancing FBMC/OQAM system performance, paving the way for its implementation in future communication networks.

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Funding

The authors declare that no funds, grants, or other support were received during the preparation of this manuscript.

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Authors

Contributions

Mokhtar Besseghier: Wrote the main manuscript text, Validation, Supervision, Software, Project administration, Formal analysis, Reviewed the manuscript. Ahmed Bouzidi Djebbar: Supervision, Resources, Formal analysis, Reviewed the manuscript. Abdelkader Horch: Software, Methodology, Reviewed the manuscript. Samir Ghouali: Software, Investigation, Reviewed the manuscript. Abdelhak Zouggaret: Reviewed the manuscript.

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Correspondence to Mokhtar Besseghier.

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Besseghier, M., Djebbar, A.B., Horch, A. et al. Enhanced Estimation of Channel and CFO in FBMC/OQAM via ZFBMC-Based Preamble. Wireless Pers Commun 139, 1815–1836 (2024). https://doi.org/10.1007/s11277-024-11701-3

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