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Light Fidelity (Li-Fi) is an advanced wireless communication method using visible light spectrum and light emitting diodes (LEDs) for high speed data transmission. In this article, a Li-Fi system using LED arrays is investigated for indoor visible light communication and efficiency of non-return-to-zero (NRZ) and return-to-zero (RZ) on-off keying (OOK) modulation schemes are compared with including inter symbol interference (ISI). For NRZ-OOK, 100 Mbps data rate is reached at 60° FOV angle and for RZ-OOK, 500 Mbps data transmission rate is achieved at the same FOV angle because of reduction in ISI.