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Pilot-Assisted Direct-Current Biased Optical Orthogonal Frequency Division Multiplexing Visible Light Communication System

Authors: Ayad A. Abdulkafi, Shahir F. Nawaf, Mohammed K. Hussein, Ibrahim K. Sileh, Fouad A. Abdulkafi

Abstract:

Visible light communication (VLC) is a new approach of optical wireless communication proposed to support the congested radio frequency (RF) spectrum. VLC systems are combined with orthogonal frequency division multiplexing (OFDM) to achieve high rate transmission and high spectral efficiency. In this paper, we investigate the Pilot-Assisted Channel Estimation for DC biased Optical OFDM (PACE-DCO-OFDM) systems to reduce the effects of the distortion on the transmitted signal. Least-square (LS) and linear minimum mean-squared error (LMMSE) estimators are implemented in MATLAB/Simulink to enhance the bit-error-rate (BER) of PACE-DCO-OFDM. Results show that DCO-OFDM system based on PACE scheme has achieved better BER performance compared to conventional system without pilot assisted channel estimation. Simulation results show that the proposed PACE-DCO-OFDM based on LMMSE algorithm can more accurately estimate the channel and achieves better BER performance when compared to the LS based PACE-DCO-OFDM and the traditional system without PACE. For the same signal to noise ratio (SNR) of 25 dB, the achieved BER is about 5×10-4 for LMMSE-PACE and 4.2×10-3 with LS-PACE while it is about 2×10-1 for system without PACE scheme.

Keywords: Channel estimation, OFDM, pilot-assist, VLC.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.3300368

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References:


[1] D. Karunatilaka, F. Zafar, V. Kalavally, and R. Parthiban, “LED based indoor visible light communications: state of the art,” IEEE Communications Surveys and Tutorials, vol. 17, no. 3, pp. 1649–1678, 2015.
[2] Miramirkhani, Farshad and Murat Uysal. "Channel modeling and characterization for visible light communications." IEEE Photonics Journal, vol. 7, no. 6, pp. 1-16, 2015.
[3] Armstrong, Jean. "OFDM for optical communications." Journal of lightwave technology, vol. 27, no. 3, pp. 189-204, 2009.
[4] Hussein, Y. S., Alias, M. Y., Abdulkafi, A. A., Omar, N., & Salleh, M. K. B., “Expectation-maximization-based channel estimation algorithm for OFDM visible light communication systems.” International Journal of Engineering & Technology, vol. 7, no. 4, pp. 2638-2645, 2018.
[5] Wang, J. B., Jiao, Y., Dang, X. Y., Chen, M., Xie, X. X., & Cao, L. L. ”Training sequence based channel estimation for indoor visible light communication system.” Optoelectronics Letters, vol. 7, no. 3, pp.213-216, 2011.
[6] Pham, Q., Rachim, V., An, J., & Chung, W. Y. “Ambient light rejection using a novel average voltage tracking in visible light communication system.” Applied Sciences, vol. 7, no. 7, pp. 670, 2017.
[7] Zhuang, X., & Vook, F. W., “Iterative channel estimation and decoding for a turbo-coded OFDM system via the EM algorithm.” In 2002 IEEE Int. Conf. Acoustics, Speech, and Signal Processing, vol. 3, pp. III-2337.
[8] Popoola, W. O., Ghassemlooy, Z., & Stewart, B. G. ”Pilot-assisted PAPR reduction technique for optical OFDM communication systems.” Journal of Lightwave Technology, vol. 32, no. 7, pp.1374-1382, 2014.
[9] Popoola, W. O., Ogunkoya, F. B., & Sinanović, S. “Mitigating nonlinearities under average power constraint in visible light communication.” In 2014 IEEE Int. Wirel, Communications and Mobile Computing Conf. (IWCMC), pp. 815-820, 2014.
[10] Y. Li, L. J. Cimini and N. R. Sollenberger, “Robust channel estimation for OFDM systems with rapid dispersive fading channels,” IEEE Transactions on Communications, vol. 46, no. 7, pp. 902–915, 1998.
[11] L. Hanzo, M. M¨unster, B. J. Choi and T. Keller, “OFDM and MC-CDMA for Broadband Multi-user Communications, WLANs and broadcasting,” Reading, Massachusetts: Wiley, 2005.
[12] Lee, H., Kim, Y., & Sohn, K. ”Optical wireless sensor networks based on VLC with PLC-Ethernet interface.” WASET, Int. Journal of Electronics and Communication Eng., vol. 5, no. 9, pp.245-248, 2011.
[13] Abdulkafi, A. A., Alias, M. Y., & Hussein, Y. S. ”A Novel Approach for PAPR Reduction in OFDM-Based Visible Light Communications.” In 2017 IEEE Int. Conf. on Platform Technology and Service (PlatCon), pp. 1-4. 2017.
[14] Y. Liu, Z. Tan, H. Hu, L. J. Cimini and G. Y. Li, "Channel Estimation for OFDM," IEEE Communications Surveys & Tutorials , vol. 16, no. 4, pp. 1891 - 1908, 2014.