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Simulative Performance Analysis of Radio over Fiber Systems in Broadband Access Networks

Author: ZhuXin
Tutor: YePeiDa
School: Beijing University of Posts and Telecommunications
Course: Electromagnetic Field and Microwave Technology
Keywords: RF signal light transmission (RoF) Coded Modulation Nonlinear Fiber dispersion Direct modulation / external modulation
CLC: TN915.6
Type: Master's thesis
Year: 2009
Downloads: 124
Quote: 1
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Abstract


The 21st century is the century of unprecedented development of information technology , communication in society is becoming more and more important with the rapid advance of information technology . With the increasing demand of high-speed multimedia mobile communications , wireless communication systems are increasingly high requirements for broadband transmission capacity wireless access technologies are faced with unprecedented challenges . How to solve the coverage problem of the buildings wireless high-speed data transmission and wireless access to the urgent need to address the key technical . On the other hand , the optical fiber communication system has a good anti-electromagnetic interference , low loss, high bandwidth advantages . However, the high bandwidth of the fiber has not been effective and sufficient use of commercial systems using only a very small part . RoF technology should be a high - speed large-capacity wireless communication needs , emerging wireless access technology developed combining the optical fiber communication and wireless communication . The technology has become one of the most promising solutions to solve the above problems . RoF system using optical fiber as the transmission link between the base station and the central station , the RF signal is transmitted through the optical carrier , its key technologies to solve the nonlinear , dispersion , and other issues affecting the transmission performance . Therefore, the thesis the RoF transmission performance of the system in the way of direct and external modulation theory analysis ; combined with simulation results , focusing on analysis of the transmission performance of directly modulated RoF systems based on different coded modulation , and gives the system design and optimization recommendations . The main work is as follows : ( 1 ) RoF system works , the technical classification , current research and technical characteristics and application . (2) establish a theoretical analysis model , respectively, theoretical analysis on the the RoF system components based on direct modulation and external modulation and transmission performance , the key factors that may affect system performance . ( 3) to build a simulation platform , from the bit error rate , spectrum and constellation diagram , the researchers analyzed the typical RF xPSK, xQAM, OFDM modulation signal directly modulated RoF system transmission performance , ultimately proposed class system design and optimization recommendations.

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