超宽带非相干接收机平均性能研究-通信与信息系统专业毕业论文.docx

Classified Index: :
Dissertation for the Master Degree in Engineering
INVESTMENT OF AVERAGE PERFORMANCE FORUWB NON-COHERENT
RECEIVER
Candidate:
Wang Ye
Supervisor:
Prof. Zhang Qinyu
Academic Degree Applied for:
Master of Engineering
Speciality:
Communication and Engineering
Information
Affiliation: Shenzhen Graduate School
Date of Defence: June, 2009
Degree-Conferring-Institution: Harbin Institute of Technology
要
由于超宽带(Ultra-Wide Bandwidth,UWB)通信技术具有低功耗、短距离、高速率、低成本等特性,使其成为下一代移动通信物理层关键技术实现的最佳候选方案之一。近年来,超宽带技术在脉冲波形设计、调制方式、脉冲发射技术以及超宽带多径信道方面都取得了显著的成果。接收机技术是超宽带实现的重点和难点问题。如何有效的评价超宽带接收机在衰落信道下的平均性能对超宽带接收机有着重要的理论价值和应用价值。
本文在对超宽带接收机的研究特点、研究现状等问题进行了介绍之后,对超宽带非相干能量检测(Energy Detection,ED)接收机的理论分析与性能评价问题进行了深入的讨论。所有的理论分析与性能评价均在统计意义下开展,相比于针对特定信道实现的理论分析与评价具有更加普遍性的理论价值和系统实现参考价值。
具体而言,本文首先对超宽带接收机从信道模型、调制方式、接收机方案等几个主要方面进行了简明的分析,在对比各种技术的特点之后,给出了本文的具体研究方案。接下来,针对 IEEE 多径信道的统计性能进行了深入的分析,利用随机点过程,求得了多径信道在时延拓展周期内的均值、方差、偏度系数、峰度系数等数字特征,并根据这些结果对信道能量的概率密度分布函数进行了对数正态分布拟合,并将其拟合结果与传统的基于中心极限定理的高斯近似办法进行了对比,证明了拟合的有效性。
在对信道能量的数字特征和概率密度函数进行了深入的研究之后,基于此结果,分别分析了低速与高速系统的平均误码率性能,并给出系统码速率与平均误码率之间的关系;最后,针对接收机优化问题,提出检测门限与最优窗口长度的次最优解决方案,在简化接收机复杂度的同时,保证了接收机的平均误码率性能。

关键词:超宽带;能量检测;随机点过程;信道模型;理论性能评价;优化



Abstract
Ultra-Wide Bandwidth (UWB) is ing one of the petitive candidates for next generation work since character of low-power, short-range, high-speed and low-cost. In recent years, there are many significant results associated with pulse-shape design, such as modulation scheme, transmitter, and multi-path channel are presented. Receiver is one of the most important points in UWB system and how to assess efficiently the average performance of UWB receiver over multi-path channel is fundamental problem to design receiver.
In this thesis, after introducing the character and recent hot issues of UWB receiver, theorical analysis and performance evaluation on energy detection (ED) receiver for UWB are investigated. All of results are derived from the statis