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This paper contemplates a relay-assisted visible light communication (VLC)system, where the light source (Table lamp) acts as a relay node and cooperateswith the main light source. Following the IEEE 802.15.7r1 VLC reference channelmodel, we assume that there are two different light sources present in anoffice room. The first one is the source terminal present on the ceiling andanother one is the desk lamp that serves as the relay station which works infull-duplex method. Because of the loop interference channel, we model VLCrelay terminal using ray tracing simulations. We have analyzed bit error rate(BER) performance of the relay-assisted VLC system using binary phase shiftkeying-subcarrier intensity modulation (BPSK-SIM) technique. The proposedmethod outperforms existing phase shift keying (PSK) and square M-quadratureamplitude modulation (M-QAM) techniques. The proposed VLC system using BPSK-SIMtechnique achieves a BER performance of for an SNR of 20 dB. The results ofproposed full duplex and half duplex relayed VLC system are evaluated usingequal power allocation (EPA) and optimum power allocations (OPA) techniquesover three different modulation schemes which are 2-PSK, square M-QAM,BPSK-SIM.

BER Analysis of Full Duplex Relay assisted BPSK-SIM based VLC System for Indoor Applications