(完整版)基于FPGA的OFDM调制器的仿真设计_毕业设计

Abstract

Orthogonal Frequency Division Multiplexing (OFDM) technique is a multi-carrier digital modulation technology, as a kind of can effective against interference and symbol interference between the signal channel of high speed transmission technology, with its high spectrum efficiency, strong ability to resist multipath fading and narrowband interference resistant performance is good, low cost, etc, has been widely applied. It can satisfy the high speed wireless communications, broadband and mobile needs, be the first choice of the fourth generation mobile communication technology, is also a hot problem in the study on the current mobile communication technology.

FPGA (Field Programmable Gate Array) is a kind of programmable logic devices, it has shorter design time, the characteristics of less investment, small risk, and can be repeatedly modified and programming repeatedly, until fully meet the needs, other ways incomparable convenience and flexibility. These features make the FPGA can achieve high performance of OFDM communication system transceiver module function.

This article overview the basic concept of OFDM system are introduced, the basic working principle and key technology, points out the advantages of OFDM modulation technique; This paper introduces the basic principles and the FPGA design of process; Further for OFDM demodulation scheme based on FPGA design; Simulation platform is

designed for a variety of test environment, scheme optimization and simulation waveform for validation.

Chapter 1, first of all, this paper first introduces the research background, purpose and significance of OFDM. Chapter 2, the practice of the basic principle of OFDM and technology were reviewed, and the key technologies of OFDM system has made the detailed introduction. Chapter 3 illustrates theory of OFDM modulation demodulation, and IFFT and FFT structure of OFDM system is introduced. Chapter 4 describes the OFDM modulator of MTALAB simulation. VERILOG simulation of OFDM modulator are described in chapter 5, and the simulation results were compared. Chapter 6 main advantages and disadvantages of OFDM technology, and its development is prospected.

Key Words: Orthogonal Frequency Division Multiplexing (OFDM); Field Programmable Gate Array (FPGA) ; simulation

目 录

第1章 绪

论...................................................................................................................1

1.1 OFDM的研究背

景............................................................................................1 1.2 OFDM的研究目的和意

义................................................................................1 第2章OFDM技术基

础...............................................................................................2

2.1 OFDM的基本原

理............................................................................................2 2.2 OFDM技术的实

现............................................................................................4 2.3 OFDM系统的关键技

术....................................................................................5

2.3.1 同步技

术....................................................................................................5 2.3.2 信道估

计....................................................................................................6 2.3.3 降低峰值平均功率

比................................................................................6 2.3.4 均

衡............................................................................................................6