The study of orthogonal frequency division multiplexing system's performance in radio on fiber link

Abstract

The radio-on-fiber (RoF) has attracted world attention due its ability to increase the capacity of wireless network. The RoF concept is that the information is transported through optical fiber by modulating the light with the analog signal (radio signal). Orthogonal frequency division multiplexing (OFDM) is a technology that transmits multiple signals simultaneously over a single transmission path, such as a cable or wireless system. OFDM has numerous advantages which make it a choice as a modulation technique to be adopted in broadband wireless network. One of it advantages is high spectral efficiency. Due to the interest in employing both technologies and techniques, the performance study of an OFDM in radio-on-fiber link is proposed. By integrating these technologies, the needs toward wireless broadband and higher bandwidth to transfer much larger data can be fulfilled. In this study, it is proposed to determine the feasibility of an OFDM modulation over RoF link. The OFDM basic system has been studied and simulated. RoF link has been introduced into OFDM system and the performance of an OFDM over RoF link has been evaluated. The simulation model of OFDM over Addative White Gaussian Noise (A WGN) channel has been modeled to make performance comparison with OFDM over RoF link simulation model. The results have been analyzed using the output parameter which is bit error rate (BER), power spectrum density and constellation. From the results, it can be concluded that OFDM is feasible in transmitting over RoF channel.