Efficient frequency‐domain channel equalisation methods for OFDM visible light communications. Issue 1 (1st January 2017)

• Record Type: Journal Article
• Authors: Lin, Bangjiang; Tang, Xuan; Ghassemlooy, Zabih; Zhang, Shihao; Li, Yiwei; Wu, Yi; Li, Hui
• Is Part Of: IET communications. Volume 11:Issue 1(2017)
• Page Start: 25
• Page End: 29
• Publication Date: 2017-01-01
• Subjects: optical modulation -- time‐varying channels -- quadrature amplitude modulation -- quadrature phase shift keying -- least mean squares methods -- equalisers -- free‐space optical communication -- OFDM modulation -- channel estimation -- frequency‐domain analysis; time‐varying VLC optical channel -- error vector magnitude -- 64‐quadrature amplitude modulation mapping -- 16‐quadrature amplitude modulation mapping -- quadrature phase shift keying -- OFDM‐VLC system -- orthogonal frequency division multiplexing visible light communications system -- ISFA scheme -- WIFA scheme -- intrasymbol frequency‐domain averaging scheme -- minimum mean squared error scheme -- MMSE scheme -- weighted interframe averaging scheme -- frequency‐domain channel estimation methods -- frequency‐domain channel equalisation method; Telecommunication systems -- Periodicals; Speech processing systems -- Periodicals; 621.38205
• DOI: 10.1049/iet-com.2016.0787
• Languages: English
• ISSNs: 1751-8628

Abstract

Abstract : The authors present efficient frequency‐domain channel estimation methods based on the intra‐symbol frequency‐domain averaging (ISFA), minimum mean squared error (MMSE) and weighted inter‐frame averaging (WIFA) schemes for the orthogonal frequency division multiplexing (OFDM) visible light communications (VLC) system. OFDM‐VLC with quadrature phase shift keying, 16‐ and 64‐quadrature amplitude modulation mapping is experimentally demonstrated. Compared with the conventional least square channel estimation method, ISFA, MMSE and WIFA offer improved performance with MMSE offering the best performance in terms of the error vector magnitude but at the cost of high complexity. The authors show that the WIFA can improve the estimation accuracy of time‐varying VLC optical channel.