Ultra Wide Band Multiple Access by Using DS-BPSK

论文摘要

根据流行的定义,任何能产生带宽超过500MHz或者分数带宽大于0.2的信号的无线通信技术,均可被认为是超宽带技术。超宽带技术允许在3.1到10.6GHz的无牌照频谱区间以较低的平均功耗和兆比特每秒的速率传送数据。目前存在几种脉冲波形,如高斯型双合透镜脉冲波形,高斯单环脉冲波形（Gaussian Monocycle Pulse Shape）,高斯脉冲波形以及矩形脉冲波形。脉冲波形的选择将会影响到系统的性能,因为超宽带波形需要占用大量的带宽。我们将在多用户和多径环境下研究超宽带系统的性能,而这种环境需要用到像跳时扩频或直接序列扩频这样著名的多路存取的扩频技术,特别是在蜂窝移动无线通信中,因为这时多个用户是在像脉冲幅度调制、脉冲位置调制和移相键控等调制方式下,共享互不干扰的同一频带。在本文的研究中,将用到直接序列扩频-二进制移相键控技术,它表明直接序列多址技术将有可能达到更高的数据传输速率。首先将在单用户和加性高斯白噪声信号下验证超宽带系统的性能,然后再在有干扰的多用户下验证。对一个具有10个用户,采用层次化结构的网络进行仿真,并构造了一个31位长度的编码。

论文目录

Abstract

摘要

Table of Contents

List of Figures

List of Tables

CHAPTER1: INTRODUCTION

1.1 Motivation

1.2 Problem Definition

1.3 Ultra Wide Band （UWB）

1.4 Direct Sequence Technique and BPSK modulation

1.5 Dissertation Outline

CHAPTER2: AN OVERVIEW OF UWB

2.1 Review and Background

2.2 UWB History

2.3 Advantages of UWB

2.3.1 Ability to Share the Frequency Spectrum

2.3.2 Large Channel Capacity （Data Rate）

2.3.3 Ability to Work with Low Signal-to-Noise Ratios

2.3.4 Low Probability of Intercept and Detection

2.3.5 Resistance to Jamming

2.3.6 Simple Transceiver Architecture

2.3.7 High Performance in Multipath Channels

2.3.8 Superior Penetration Properties

2.4 Disadvantages of UWB

2.5 Challenges of UWB

2.6 Differences between UWB and Spread Spectrum

2.7 UWB Applications

2.8 Summary

CHAPTER3: UWB Signals Definition

3.1 Definition of UWB Signals

3.2 UWB Pulse Shapes

3.3 Pulse Modulation

3.3.1 Pulse Position Modulation

3.3.2 Pulse Amplitude Modulation

3.3.3 Pulse Shift Keying Modulation

3.4 Spread Spectrum Techniques

3.4.1 Direct Sequence Spread Spectrum

3.4.3 Frequency Hopping Spread Spectrum

3.5 Summary

CHAPTER4: DS-BPSK Mechanism

4.1 Introduction to DS-BPSK

4.2 System Components and Limitations

4.2.1 Transmitter Model

4.2.2 Channel Model

4.2.3 Receiver Model

4.3 Summary

CHAPTER5: Simulation and Performance Evaluation

5.1 Parameters

5.2 Factors

5.2.1 Codes

5.2.2 SNR

5.2.3 MAI

5.2.4 Synchronization

5.2.5 BER

5.3 Data of the Experiment

5.4 Simulation's Results

5.5 Comparison with Other DS-BPSK BER

CONCLUSIONS

REFERENCES

ACKNOWLEDGMENT

Appendix A

Ultra Wide Band Multiple Access by Using DS-BPSK

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