Abstract
<p class="0abstract">Visible Light Communication (VLC) as one of wireless technology must be able to offer a good capability as mobile communication system. The signal will be faded when the distance and angle of LED to photo-detector become higher at a certain distance. Other problem at VLC system is light interference noise which is caused by flicker effect from other light sources such as incandescent, fluorescent, DC-lamp (i.e. flashlight) and the sunlight. Each of lights have specific carried signal characteristics and it can influences the VLC system. In this paper we offer design of mobile VLC system based on analog domain. We use Automatic Gain Controller (AGC) circuit using commercially available IC and it will be placed at analog front-end receiver side. AGC can self-adjust its gain according to the input signal amplitude. We also design analog filter to eliminate all interferences noise spectrum which is existed under 50 KHz. We design both circuits, analog filter and AGC in VLC receiver system with low-cost. The test data are obtained through the simulation and achieved good results in ideal condition.</p>
Highlights
Visible light communication (VLC) technology is worthed to be developed and explored further, because this communication technology serves several advantages.VLC is different with other optical wireless communications (OWC) such as laser and infra-red
During the light propagates in the free space, the signal information which is carried by light source became attenuated, and suffer with interference noise as well as ambient light noise
The proposed circuit of analog front-end receiver is consisted of: 1) trans-impedance amplifier which has 1.78 MHz cut-off frequency, 2) analog-filter using high pass filter Sallenkey topology which able to pass signal above 51 KHz and attenuate the signal under 50 KHz, and 3) Automatic Gain Controller (AGC) which utilized available commercially ICs, LM13700 from Texas Instrument, to provide stable output signal and has 2.76 MHz bandwidth
Summary
Visible light communication (VLC) technology is worthed to be developed and explored further, because this communication technology serves several advantages. Han et al [5] use mixed methods, hardware and software, to build AGC for RF communication to reduce high PAPR signal in OFDM This proposed design can be adapted in VLC system. We propose solution to reduce these noise by using analog filters (Sallen-key high pass filter & twin-T notch filter) placed in receiver-side with specific cut-off frequency [6]. This designed filter perform well both for analog modulation and digital modulation, interference signal became attenuated and can improve BER, even though it only use commercially available component. We use analog domain approach at receiver-side of VLC platform in order to design noise-filter circuit and AGC circuit that is customizable and low-cost
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