Ju Bin Song

Adjacent Channel Power Ratio of OFDM Signals for Broadband Convergence Networks

In this paper, adjacent channel power ratio (ACPR) of orthogonal frequency division multiplexed (OFDM) system interconnected with radio over fiber (RoF) link at 2.3 GHz WiBro environment were analyzed and simulated at both system ends.

Next Generation Rural Wireless Connectivity Model for Developing Countries

Next generation wireless technology with converged voice and data applications can offer rural connectivity for proper boost in information and communication technology (ICT). In this study, a cost-effective ICT based solution for economic development of rural community in developing countries using appropriate next generation wireless networking technology has been represented. In the target country, Bangladesh, several wireless rural points (WRPs) in a village will be connected to the local server of the village called wireless access point (WAP). Each of several WAPs will be connected to several rural resource servers (RRSs) and thus will form a rural resource network (RRN). Adopting the proposed model with the existing ICT infrastructure of the target country can provide significant economic development therefore for the rural community. A similar implementation in other developing countries can offer a massive success

Next Generation Converged Connectivity Model for Rural Business Opportunities in Developing Countries

In this paper, a cost-effective next generation converged network connectivity model has been proposed for the rural business opportunities in developing countries with an optical fiber backboned wireless rural point (WRP)-rural resource network (RRN) approach.

On the Nonlinear Distortion Effects in Nonlinear Distortion Effects in

Radio over fiber (RoF) system is a promising technique for microcell and picocell applications for deployment of future ubiquitous wireless data networks. However, the performance of RoF systems can be severely degraded due to nonlinear effects in the channel. Also, orthogonal frequency division multiplexing (OFDM), as a standard for broadband wireless networks, is being proposed for deployment with RoF systems to facilitate the total performance of a system. In this research, at first, the performance of OFDM-based RoF link with Mach-Zehnder modulator distortion effects has been analyzed at 5.8 GHz. Evaluation of mean-squared error of the proposed OFDM-RoF system was carried out to compare with the conventional single carrier system based RoF link after the modulator distortion case and also for fixed signal to noise ratio (SNR) of 20 dB using undistorted OFDM signal. Later, nominal and offset biasing pre-distortion techniques are applied in proposed system to linearize the OFDM-RoF link. Thus, finally a comparison between the aforementioned pre-distortion techniques applied showed important observation in terms of distortion-free dynamic range and SNR to choose offset predistortion technique for our proposed system