682Mbit/s phosphorescent white LED visible light communications utilizing analog equalized 16QAM-OFDM modulation without blue filter

• Published in: Optics communications 2015-11, Vol.354, p.107-111
• Main Authors: Li, Honglei, Zhang, Yini, Chen, Xiongbin, Wu, Chunhui, Guo, Junqing, Gao, Zongyu, Pei, Weihua, Chen, Hongda
• Format: Article
• Language: English
• Subjects: Blue filter; High-speed; OFDM; Phosphorescent white LED; Visible light communication
• ISSN: 0030-4018; 1873-0310
• DOI: 10.1016/j.optcom.2015.05.033

In this paper, a 682Mbit/s phosphorescent white LED visible light communication (VLC) system utilizing 16-quadrature-amplitude-modulation orthogonal frequency division multiplexing (16QAM-OFDM) modulation based on analog equalizers without blue filter is firstly experimentally demonstrated. The 3-dB bandwidth of white channel VLC link is enhanced from 3 to 143MHz by using proposed optimal analog equalizers. On the basis of equalized modulation bandwidth, the maxim transmission data rate of 682Mbit/s based on 16QAM-OFDM modulation could be achieved at the distance of 1m and the resultant bit-error-ratio (BER) is 2.5×10−3. The VLC link also could be operated at illumination level of ~1000lx with data rate of 520Mbit/s and the BER is 3.76×10−3. All the BERs are below the forward-error-correction (FEC) limit 3.8×10−3. The results show that analog equalizers could be used in 16QAM-OFDM VLC system. In addition, our transmitter and receiver modules are with compact size. The proposed VLC link without blue filter provides a solution for high-speed low-complexity VLC application based on OFDM modulation. •The VLC link does not utilize optical blue filter.•Optimal analog equalizers are designed for white light response.•The 3-dB bandwidth of white light channel VLC link is enhanced from 3 to 143 MHZ.•Data rate of 682 Mb/s is achieved based on analog equalized 16-QAM-OFDM modulation.•Both transmitter and receiver modules are compact size.