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Conference Paper
A Modified A-Law Companding Scheme for Indoor Visible Light Communication
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- Authors
- Jin Hyuk Song, Jong Soo Lim, Heung Mook Kim
- Issue Date
- 2014-09
- Citation
- International Conference on Consumer Electronics (ICCE) 2014 : Berlin, pp.254-255
- Publisher
- IEEE
- Language
- English
- Type
- Conference Paper
- Abstract
- Visible light communication (VLC) has been received much attention because it simultaneously provides data transmission and illumination without electromagnetic wave interference. However, the modulation using discrete multi-tone (DMT) is possible to suffer from harmful effect of human eye. To solve this problem, this paper introduces the manner of applying constant envelope orthogonal frequency division multiplexing (CE-OFDM) to VLC and then proposes optimal companding scheme. The basic idea is to deliberately convert statistical distribution of phase modulator input signal into quasi-uniform distribution using modified A-law companding (MA-law companding). The proposed scheme can bring enhancement of system performance regardless of the scaling constant. Simulation results show that bit error rate (BER) performance of the proposed MA-law companding is superior to original CE-OFDM and conventional companding schemes.
- KSP Keywords
- Bit Error Rate(And BER), CE-OFDM, Constant Envelope(CE), Data transmission, Discrete multi-tone(DMT), Human eye, Input signal, Orthogonal frequency division Multiplexing(OFDM), System performance, Uniform Distribution, Visible light communication(VLC)