Orthogonal Frequency Division Multiplexing (OFDM) is intensively applied in Visible Light Communication (VLC) systems due to its numerous advantages such as high data rate, provides high bandwidth efficiency and robustness against Intersymbol Interference (ISI). The Xilinx System Generator for DSP is a plug-in to Simulink that enables designers to develop high-performance. This paper will talk about design VLC using 4×4 Discrete Cosine Transform (DCT) and 4 Pulse Amplitude Modulation (PAM) and using 8×8 Discrete Cosine Transform (DCT) and 8 Pulse Amplitude Modulation (PAM) in Xilinx system generator This paper will test the performance with several experiments with indicators of SNR effect on SER, the effect of Eb / E0 on SER and the effect of a large amount of data on SER. Performance simulation results of the SNR effect on SER which shows that, the 4 PAM-DCT system is more resistant to noise compared to 8 PAM-DCT because system 4 PAM-DCT has fulfilled telecommunication standart that is SER under 0.003 when SNR is 12 dB while for system 8 PAM-DCT when SNR is 14 dB. The maximum number of data quantity that can be transmitted in OFDM Visible Light 4 and 8 PAM-DCT systems is under 700000. System 4 PAM-DCT produced PAPR of 5, which means that it is smaller than 8 PAM-DCT, which is 49.