Bektas, E.B.Panayırcı, Erdal2023-10-192023-10-19202039781728172064https://doi.org/10.1109/SIU49456.2020.9302481https://hdl.handle.net/20.500.12469/495828th Signal Processing and Communications Applications Conference, SIU 2020 --5 October 2020 through 7 October 2020 -- --166413Visible Light Communication(VLC) has been considered as a potential access option for 6G wireless systems to solve performance limitation due to bandwidth shortage at radio frequency (RF) band. In VLC system, illumination infrastructure has dual usage at the same time namely illumination and wireless data transmission. DC-Biased optical DCO-OFDM with clipping has been proposed for VLC systems to provide optically power efficient solution and easy implementation. Wireless communication systems generally require estimating and tracking the fading channel in order to detect transmitted data coherently. In this work, we propose a pilot-aided iterative channel estimation algorithm to efficiently estimate the optical channel coefficients of a clipped DCOOFDM system operating with additive white Gaussian noise (AWGN). The estimation algorithm is capable of improving the channel estimation by making use of pilot symbols with interpolation or using the channel estimate of previous OFDM block to obtain the next estimate for the iterative algorithm. In each iteration, the clipping noise is estimated and compensated in the frequency domain. Simulation results verify that the proposed channel estimation algorithm reduces the bit error rate (BER) and mean-square error (MSE) of channel estimate can be significantly. © 2020 IEEE.trinfo:eu-repo/semantics/closedAccessclipping noiseDC-biased optical orthogonal frequency division multiplexing (DCO-OFDM)pilot-aided iterative channel estimationVisible light communication (VLC)Bit error rateData communication systemsFading (radio)Fading channelsFrequency domain analysisGaussian noise (electronic)Iterative methodsLight transmissionMean square errorOrthogonal frequency division multiplexingVisible light communicationWhite noiseAdditive White Gaussian noiseChannel estimation algorithmsIterative channel estimationPerformance limitationsPower-efficient solutionsVisible light communications (VLC)Wireless communication systemWireless data transmissionChannel estimationConference Object10.1109/SIU49456.2020.93024812-s2.0-85100319059N/AN/A