This paper presents an innovative scheme for estimating the channel impulse response (CIR) in sparse multipath conditions for asymmetrically clipped direct current-biased op-tical OFDM (ADO-OFDM) visible light communication (VLC) systems, utilizing Bayesian learning (BL) techniques. We derive a multipath CIR model capturing both specular and diffusive reflections within the VLC system. Subsequently, we present a novel scheme for estimating the CIR in sparse multipath scenar-ios using the BL paradigm, which leverages the inherent sparsity of the multipath CIR in the delay domain. This scheme neces-sitates a constrained set of pilot subcarriers, thereby reducing pilot overhead when juxtaposed with traditional state-of-the-art channel estimation (CE) techniques. To assess the performance of the proposed BL-based paradigm for estimation, we compute the Oracle-MMSE (O-MMSE) along with the Bayesian Cramer Rao lower bound (BCRLB). Our extensive simulations reveal that even with a lower pilot overhead, the suggested BL method surpasses other conventional and sparse CE techniques across key metrics such as bit error-rate (BER) and normalized mean-square-error (NMSE).
Bayesian Learning-Based Sparse Channel Estimation in Visible Light ADO-OFDM Systems
2024-06-24
411412 byte
Conference paper
Electronic Resource
English
Pilot design for compressed sensing based OFDM sparse channel estimation
British Library Online Contents | 2018
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