Major Project Sample Report

Shri Mata Vaishno Devi University
Jammu & Kashmir

School of Electronics & Communication Engineering

Major Project
Phase-I
Report on

‘Implementation of OFDM Communication System’

Under the Guidance of

Dr/Mr

By

This report is submitted by………………………………….Entry No:…………………………….in partial fulfillment of the Bachelor of Technology in Electronics and Communication Engineering degree requirements of Shri Mata Vaishno Devi University.

Student’s Signature

Guide’s Signature Director’s Signature

Abstract

This report discusses the design and implementation of an OFDM modem for a simplex communication between two PCs over a frequency selective channel. First a brief introduction is provided by explaining the background and the specification of the project. Then the report deals with the system model. Each block of the OFDM system is described (IFFT/FFT, cyclic prefix, modulation/demodulation, channel estimation, bit loading). In the following section, the system architecture is analysed. The transmission protocol, as well as the system parameters is explained in details. Then, the DSP implementation is discussed. Finally, the results are provided in the last chapter.

Aknowledgment

We would like to thank our project assistant,……….., for his help during the study of this project.

Contents

Abstract 1
Aknowledgment 2

1 Introduction 7
1.1 Background 7
1.2 Specification 7
1.3 Equipment/Software Requirement 7
1.4 Project overview 8

2 System Model 9
2.1 Overview 9
2.1.1 Transmitter 9
2.1.2 Channel 10
2.1.3 Receiver 10
2.2 OFDM System 11
2.2.1 Evolution 11
2.2.2 Introduction to OFDM 12
2.2.3 FFT and IFFT 12
2.2.4 Cyclic Prefix 13
2.2.5 Modulation and demodulation 14
2.2.6

References: 31 Chapter 1 Introduction 1.1 Background In a basic communication system, the data are modulated onto a single carrier frequency. The available bandwidth is then totally occupied by each symbol. This kind of system can lead to inter-symbol-interference (ISI) in case of frequency selective channel. The basic idea of OFDM is to divide the available spectrum into several orthogonal sub channels so that each narrowband sub channel experiences almost flat fading. With OFDM, it is possible to have overlapping sub channels in the frequency domain, thus increasing the transmission rate. OFDM systems have gained an increased interest during the last years. It is used in the European digital broadcast radio system, as well as in wired environment such as asymmetric digital subscriber lines (ADSL). This technique is also used in digital subscriber lines (xDSL). Notice This is for the information of all students of 7th Sem. ECE that they are required to submit their Major Project Phase –I report in the format attached herewith, duly signed by the respective guide, to the undersigned, latest by 1st Dec-2010. It may please be noted that delay in the submission of same shall be treated seriously. Major Project Coordinator