Experimental demonstration of blind equalization for OFDM/OQAM-VLC system

Jin Shi; Jing He; Rui Zhang; Rui Deng

doi:10.1117/1.OE.58.6.066106

13 June 2019 Experimental demonstration of blind equalization for OFDM/OQAM-VLC system

Jin Shi, Jing He, Rui Zhang, Rui Deng

Author Affiliations +

Optical Engineering, Vol. 58, Issue 6, 066106 (June 2019). https://doi.org/10.1117/1.OE.58.6.066106

Abstract

Orthogonal frequency-division multiplexing/offset quadrature amplitude modulation (OFDM/OQAM) in direct-detection system obtains many benefits such as free of cyclic prefix (CP) and high side-lobe suppression ratio in comparison with CP-OFDM signal. Unfortunately, for OFDM/OQAM signal, it needs an extra interference cancellation process to eliminate the imaginary intrinsic interference (IMI) when using one-tap frequency equalization known as interference approximation method (IAM). Blind equalization without a pilot overhead for OFDM/OQAM signal is proposed and experimentally demonstrated in visible light communication (VLC) system with limited modulation bandwidth. Experimental results show that blind equalization for OFDM/OQAM-VLC can effectively eliminate the IMI effect and can exhibit better symbol error rate on different subcarriers. Furthermore, compared with conventional IAM, it exhibits 3.2 and 2.7 dB overall improvement in Q²-factor using blind equalization based on the constant modulus algorithm and constant norm algorithm, respectively. In addition, the system can achieve a total data rate of 3.96 Gb / s over 5-m free space link with a bit error rate lower than hard-decision forward error correction limit of 3.8 × ^{10 − 3}.

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Jin Shi, Jing He, Rui Zhang, and Rui Deng "Experimental demonstration of blind equalization for OFDM/OQAM-VLC system," Optical Engineering 58(6), 066106 (13 June 2019). https://doi.org/10.1117/1.OE.58.6.066106

Received: 7 March 2019; Accepted: 22 May 2019; Published: 13 June 2019

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