| The wireless communication technique now becomes the emphasis of communication research,and more and more people focus on it.The multicarrier transmission known as OFDM is going to become the most important technique of 4th generation system for its robustness to multipath selective fading and high bandwidth efficiency.Its basic idea is to divide a given channel into many parallel subchannels or subcarriers,so that multiple symbols are in parrllel.Though the whole channel appears as frequency-selective fading channel,the subchannels appear as orthogona,plat fading channels.The main content of this paper is to use the OFDM technology in the wireless communication system.Taking advantage of its robustness to multipath selective fading,we can process the signal transmition in fading channel.Chapter 1 Introduction.In this chapter,We first introduce the present situation and development of the mobile communication.Then we describe the basic thought of OFDM technique,and finally give the list of the content.Chapter 2 The Basic Principle Of OFDM. In this chapter,we elaborate the principle of OFDM and the mathematics model.Chapter 3 OFDM System Design And Simulation.In this chapter,we first design an OFDM transmition system,according to the detail background needs.Then we give a introduction of arithmetics for timing synchronization,frequency estimation and channel estimation.At last,we give a simulation of the arithmetics and system.Chapter 4 The FPGA Implementation Of OFDM Transmition System.In this chapter we focous on the implementation of OFDM system and complete the design of transmiter and receiver. |
