Performance Analysis Of OFDM Based RoF System

The growth of wireless data systems is seen in the many new standards which have recently been developed or currently in under development. The two major development trends of communication are broadband and wireless, and the existing wireless communication system cannot carry high-speed multimedia service signals because of limited bandwidth, so how to realize high-speed wireless access has become a key problem. The continuing increase in customer demand for broadband applications coupled with mobile cellular and personal communications has also becoming a global phenomenon. One of the solutions is radio over fiber (RoF), alternatively known as Hybrid Fibre Radio (HFR), where millimeter-wave (mm-wave) or microwave signals at the carrier frequency are delivered over an optical network from a central station (CS) to base stations (BSs). This technology combines two media: radio and optical. Typically, the optical part is used to interconnect a central radio processing facility with a remote radio antenna, the latter providing coverage to wireless broadband users. Some of the advantages offered by a RoF system include low signal attenuation (in the fibre), improved coverage and system performance, enhanced capacity, low RF power dissipation, reduced complexity due to the centralised processing of RF signals and ultimately low system costs. In recent, Orthogonal Frequency Division Multiplexing (OFDM) is an emerging technology for high data rates at particular new and upcoming mobile generation and fixed broadband. OFDM is a multicarrier transmission; it congenial for frequency channel selection with high data rates. This technique transforms a frequency selective with wide band channel into a group of non-selective narrowband channels, which make large orthogonality in frequency domain. The OFDM through RoF system is to increase modulation technique and it overcomes various limitation of the wireless transmission such as electrical power attenuation, chromatic dispersion and phase modulation through the optical link. The combination of system has many advantages for future high speed data transmission system. The organization of paper includes an overview of OFDM system, RoF technique and combination of RoF-OFDM. And to analyze the implementation of RoF-OFDM system and various parts of the Radio over Fibre system which is designed for various no: of channel counts and simulated at various power levels with the help of software optisystem. And results are analyzed on the basis of Q factor, BER. Index Terms — BER, CAPC DSB, OFDM, Optisystem , Q Factor, RoF, SDDPMZM. ——————————  ——————————