TH-PPM超宽带系统室内信道下性能及容量分析

(74页)

'TH-PPM超宽带系统室内信道下性能及容量分析'
中国海洋大学硕士学位论文TH-PPM超宽带系统室内信道下性能及容量分析姓名:吕婷婷中请学位级别:硕士专业:通信与信息系统指导教师:张浩20090601TH-PPM超宽带系统室内信道下性能及容量分析当今的数据通信中,对服务速率和业务的需求越来越多,而日益缺乏的频谱 和受限的功率,使资源与需求的矛盾越来越突出,超宽带无线通信技术 (Ultra-wide band wireless communication)直接发送纳秒级宽度窄脉冲进行通信, 因而可以在很低的功率谱密度下,以单带或多带的调制方式达到高速的传输速 率,成为给数据通信领域的热点,在无线局域网(WLAN).无线个人局域网 (WPAN)的应用中,发挥着日益重要的作用。本文主要研究了超宽带无线通信技术的原理,阐述了UWB系统脉冲波形的 设计要求,着重描写了本文选用的脉冲波形;对UWB系统的调制技术进行总结 和分析,并介绍了 UWB系统所用到的扩频技术。重点研究了流行的各种室内信道模型,包括h_K模型,S?V模型和IEEE 805.15.3a室内信道模型,并分析利弊,引出了一种适合UWB系统误码性能和容量分析的信道模型。文章针对跳时 脉冲脉位调制(TH-PPM, Time-Hopping Pulse Position Modulation)的 UWB 系统, 分别从单用户和多用户两种情况下考虑,推导了系统在加性高斯白噪声信道(AWGN, Additive White Gaussian Noise)下的误码率和容量公式,将其延伸至实际室内信道,分析了 TH-PPM UWB系统在室内信道下的性能和容量特征,并进行了仿真分析。文章的最后对TH-PPM系统进行改进,分两部分讨论:一是 针对PPM的改进,研究了 BPPM、NPPM系统在单用户AWGN信道下的性能和容量,并将其与TH-PPM系统进行比较分析,得出结论;另一个是针对接收机 的改进,初步研究了 Rake接收机原理,分析了 Rake接收机的模型。关键词:超宽带无线通信;TH-PPM;误码性能;容量分析Performance and Capacity Analysis of TH-PPM UWB overIndoor Fading ChannelsAbstractToday in the field of data communication> the demand for high transmission rate and diversified business is on the rise, while the spectrum resources are increasingly scarce, transmitting power is also limited. The contradiction between resources and demand is increasingly evident. Ultra-Wideband (UWB) communication systems employ ultra-short impulses to transmit information which spreads the signal energy over a very wide frequency spectrum of several GHz. It has become a hot topic in data communication, and plays a more and more important role in the field of Wireless Local Area Network (WLAN) and Wireless Personal Area Network(WPAN)>In this paper, the theory of Ultra wide band wireless communication technologies is introduced. At the beginning of the paper, it studies UWB pulse waveform and modulation technologies, spread spectrum communication technology that UWB employed is also introduced. General indoor channel models (A-Kmodel, S?V model and the indoor channel models of IEEE 802.15.3a proposal etc.) are studied, a suitable indoor channel model are proposed for the error performance and capacity analysis of TH-PPM UWB system. The error probability and capacity of TH-PPM (Time-Hopping pulse position modulation) UWB system are investigated. We consider PPM over additive white Gaussian channels for a single-user system. A multiuser environment with PPM is also investigated. The simulation analysis for TH-PPM UWB system over indoor fading channels is considered. At the last part of the paper, how to improve the performance and capacity is discussed. We consider two approaches , one is the improvement on pulse position modulation, bi-orthogonal PPM and Non-orthogonal PPM over AWGN channel is investigated; the other way is about Rake receiver. The model of Rake receiver is introduced.Keywords: Ultra Wide Band wireless communication; TH-PPM; Error probability; Capacity analysis 独创声明本人声明所呈交的学位论文是本人在导师指导下进行的研究工作及取得的 研究成果。据我所知,除了文中特别加以标注和致谢的地方外,论文中不包含其 他人已经发表或撰写过的研究成果,或其他
关 键 词:
TH PPM 宽带 系统 室内 信道 性能 容量 分析
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