摘 要 .............................................................. I Abstract ............................................................ I 第1章 绪论 ......................................................... 1
1.1 UWB通信技术背景和发展现状 .................................. 1 1.2 UWB的技术特点 .............................................. 3 1.3 UWB与其它短距离无线技术的比较 .............................. 4 1.4 UWB的应用前景 .............................................. 5 1.5论文内容及结构 .............................................. 6 第2章 超宽带通信信道模型 ........................................... 6
2.1 无线信道特性 ................................................ 6
2.1.1 大尺度衰落 ........................................... 7 2.1.2 小尺度衰落 ........................................... 7 2.1.3 多径效应 ............................................... 8 2.2 超宽带室内信道模型 .......................................... 8
2.2.1 室内信道模型 .......................................... 8 2.2.2 室内信道特征参数 ..................................... 11 2.2.3 IEEE802.15.3a标准信道模型 ........................... 13 2.3 本章小结 ................................................... 16 第3章 IR-UWB信号的发射和接收 ..................................... 16
3.1 UWB无线电通信的基本原理 ................................... 16 3.2 IR-UWB脉冲 ................................................ 17 3.3 信号调制技术 ............................................... 19
3.3.1 单脉冲调制 ........................................... 19 3.3.2 多脉冲调制 ........................................... 19 3.4 超宽带系统发送信号 ......................................... 20
3.4.1 基本信号 ............................................. 20 3.4.2 调制信号 ............................................. 20
3.4.3 发送信号 ............................................. 21 3.5 多径信道PPM-TH-UWB接收机 .................................. 22
3.5.1 连续时间信道冲激响应 ................................. 22 3.5.2 离散时间信道冲激响应 ................................. 22 3.5.3 TH-PPM-UWB接收机 .................................... 22 3.6 本章小结 ................................................... 24 第4章 IR-UWB 无线通信信道仿真 ..................................... 25
4.1 发射端信号的仿真 ........................................... 25
4.1.1 二进制TH-UWB信号 .................................... 25 4.1.2 二进制TH-UWB信号的PSD分析 ......................... 26 4.1.3 其他典型IR-UWB信号及其功率谱密度仿真 ............... 29 4.2 IEEE802.15.3a标准信道模型 ................................. 41 4.3 PPM-TH-UWB信号通过不同信道环境的仿真分析 .................. 49
4.3.1 高斯噪声环境的信号传输 ............................... 50 4.3.2 IEEE802.15.3a信道环境下的信号传输 ................... 52
4.4 本章小结 ....................................................... 55 结论 ............................................................... 55 致 谢 ............................................................. 57 参考文献 ........................................................... 58
摘 要 .............................................................. I Abstract ............................................................ I Chapter One Introduction ............................................ 1
1.1 UWB communications technology background and current situation .... 1 1.2 Technical characteristics of UWB ................................ 3 1.3 UWB and other relatively short-range wireless technology ............ 4 1.4 UWB application prospects ..................................... 5
1.5 Content and structure of paper ................................... 6 Chapter Two UWB channel model ....................................... 6
2.1 Channel characteristics ......................................... 6
2.1.1 Large scale fading ...................................... 7 2.1.2 Small scale fading ...................................... 7 2.1.3 Multipath effect ....................................... 8 2.2 UWB indoor channel model ..................................... 8
2.2.1 Indoor channel model .................................... 8 2.2.2 Indoor channel characteristic parameter ..................... 11 2.2.3 IEEE802.15.3a standard channel model .................... 13 2.3 Summary ................................................... 16 Chapter Three IR-UWB signal transmission and reception ................... 16
3.1 The basic principles of UWB radio communications ............... 16 3.2 IR-UWB pulse ............................................... 17 3.3 Signal modulation ............................................ 19
3.3.1 Signal-pluse modulation ................................. 19 3.3.2 Multi-pluse modulation .................................. 19 3.4 UWB systems to send signals ................................... 20
3.4.1 Basic signal ........................................... 20 3.4.2 Modulation signal ...................................... 20 3.4.3 Send signal ........................................... 21 3.5 Multi-path channel PPM-TH-UWB receiver ....................... 22
3.5.1 Continuous-time channel impulse response .................. 22 3.5.2 Discrete-time channel impulse response .................... 22 3.5.3 TH-PPM-UWB Receiver ................................ 22 3.6 Summary ................................................... 24 Chapter Four IR-UWB wireless communication channel simulation ..... 25
4.1 Simulation of the transmitter signal .............................. 25
4.1.1 Binary TH-UWB Signals ................................ 25 4.1.2 Binary TH-UWB signal PSD analysis ...................... 26 4.1.3 Other typical IR-UWB signal and its PSD simulation ......... 29 4.2 IEEE802.15.3a standard channel model ......................... 41 4.3 PPM-TH-UWB signals through different channels of the simulation
environment ................................................. 49 4.3.1 Gaussian noise in the signal transmission ................... 50 4.3.2 Channel environment IEEE802.15.3a signal transmission ...... 52
4.4 Summary ........................................................ 55 Conclusion ......................................................... 55 Express thanks ..................................................... 57 References ......................................................... 58