International Journal of Research in Computer and Communication Technology, Vol 3, Issue 3, March- 2014 ISSN (Online) 2278- 5841 ISSN (Print) 2320- 5156 www.ijrcct.org Page 344 A Review – OFDM-RoF (Radio over Fiber) System for Wireless Network *R.Karthikeyan, **Dr.S.Prakasam *Research Scholar, Dept. of CSA, SCSVMV University, Kanchipuram, Tamil Nadu, India. **Asst. Professor, Dept. of CSA, SCSVMV University, Kanchipuram, Tamil Nadu, India. *rkarthi86@gmail.com, **prakasam_sp@yahoo.com Abstract— In future generation wireless and mobile communication system must be increase with high quality bandwidth service for inaccessible area. The recent wireless network providers require high transmission bandwidth with voice, data and multimedia service for fixed and mobile users. The recent and upcoming wireless system has different modulation technique, such as Orthogonal Frequency Division Multiplexing (OFDM), Wideband Code Division Multiplexing (WCDMA) and also it has many demand. This demand is to be satisfied for wireless system using Radio over Fiber (RoF) technique. This paper is a review implementation of OFDM to RoF system have been analyzed and proposed method discussed. Keywords — OFDM, RoF, Radio over Fiber, RF, QAM. I. INTRODUCTION Nowadays due to the various demands of system and mobile users with data capacity for wireless communication have been adequately provided by voice and data services. The demand of the broadband services today has much research on millimeter communication for wireless access network in terms of speed, efficiency of Radio Frequency (RF) devices. The wireless system as suffered many losses in the transmission as well as atmospheric attenuation, to overcome these problem use of Radio over Fiber system, it has low attenuation, electromagnetic interface, and large bandwidth. Wireless coverage of the user domain has various essential part of fixed and mobile broadband communication network. In order to offer integrated with many of demand into mobile broadband and fixed services. The wireless LAN offering up to 54 Mbps in 2.4 to 5 GHz carrier frequencies, 3G mobile networks offering up to 2Mbps in 2GHz, and 4G offering up to 40 Mbps in 2-8 GHz carrier frequencies and in recent day main wireless standard such as IEEE 802.16 mobile and fixed WiMAX offering 2-66 GHz. Current worldwide coverage of wireless network has many advance multiple accessing technologies. [1, 2] 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. Radio over Fiber (RoF) system could be the answer to many demands of the wireless network. It is suitable technology for wireless network and provides a low cost configuration, because the optical modulated signals are transmitted to the base station carrying to the fiber without significant loss and reach the mobile user via RF transmission. 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 proposed method has been taken from various methodologies. A. Radio over Fiber (RoF) Radio over Fiber system is very attractive technique for wireless access network, because it can transmit microwave and millimeter wave through optical fiber for long and short distance. It is also possible to support WLAN and current 4 th generation mobility network. Radio over Fiber system, it is the integration of RF and optical network and it increase channel capacity of mobility and application systems, as well as decreasing cost and power consumption. This system provide radio access has a number of applications to merge in the recent and next generation wireless systems includes Central Site (CS) and Remote Site (RS) connected to an optical fiber link, and signal is transmitted between CS and RS in the optical band through RoF network. This architecture as the BS to different network units is present, as shown in Fig. 1. [2, 3] Fig. 1 Radio over Fiber The establishment of Radio over Fiber system provides radio access and number of advantages including the ability