Journal
IEEE COMMUNICATIONS LETTERS
Volume 18, Issue 10, Pages 1719-1722Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LCOMM.2014.2349990
Keywords
Visible light communication (VLC); carrierless amplitude and phase (CAP) modulation; weighted pre-equalization
Categories
Funding
- NHTRDP (973 Program) of China [2010CB328300]
- NNSF of China [61177071]
- Key Program of Shanghai Science and Technology Association [12dz1143000]
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Multi-user access is one of the key problems in the visible light communication (VLC). In this paper, we propose and experimentally demonstrate an approach for multi-user access based on multi-band CAP modulation over a wavelength division multiplexing (WDM) VLC system using a single RGB LED. In this scenario each wavelength will provide 3 sub-bands. Depending on the combination of the different wavelength and the sub-bands, a dynamic capacity can be achieved for up to 9 users access. At the transmitter a weighted pre-equalization method is proposed to overcome frequency attenuation of the LED, while at the receiver a post-equalizer based on modified cascaded multi-modulus algorithm (CMMA) is utilized. The experimental results show that the bit error rate (BER) for an over-all 1.35 Gb/s CAP64 signal over 30-cm transmission can be under the 7% forward error correction (FEC) limit of 3.8 x 10(-3). The results clearly demonstrate the benefit and feasibility of the multi-band CAP modulation for the short range multi-user VLC systems.
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