【作者】 刘贵生；

【导师】 林基明；

【作者基本信息】 桂林电子科技大学 ， 通信与信息系统， 2007， 硕士

【摘要】 与传统的连续载波调制通信方式相比,利用极窄脉冲信号携带信息的超宽带(Ultra Wideband, UWB)通信方式是一种全新的通信方式。它具有许多独特的优点,如通信容量大、低截获/检测概率、频带很宽、有很强的抗多径干扰能力和分辨率高、设备成本较低等特点,这些优势使UWB通信成为了当今学术界和商业领域研究热点之一。而超宽带接收技术是实现超宽带通信的难点,本论文重点研究了高速PPM-UWB通信系统的基带PPM信号产生与接收处理,并进行了室内短距离高速PPM-UWB通信系统的实验。论文首先阐述了超宽带通信技术的基本概念、特点、发展过程、研究现状和发展趋势,然后介绍了超宽带通信系统的组成结构。在此基础上,设计了基带PPM信号的产生电路。同时,针对室内多径信道和PPM-UWB信号的特点,提出一种多路并行同步捕获接收机结构,把同步部分放到基带电路进行处理,实现了接收射频电路和基带数字处理电路的巧妙结合,简化了接收机的设计;系统基带电路通过VHDL建模与设计,并在高速FPGA芯片中实现。最后,建立传码率为100Mbps的PPM-UWB通信系统,进行室内短距离通信测试,验证设计方案的可行性,结果表明本论文提出的方法是可行的。更多还原

【Abstract】 Compared with the conventional communications that uses sinusoidal carriers to transmit information, ultra wide-band (UWB) communications which uses very narrow pulses to carry information is a new kind of communication system. Because it has many advantages, such as high system capacity, low probability of interception and detection, wide bandwidth, high robustness to multi-path interference and fine time resolution, and so on. So it has recently attracted significant academic and commercial interest. However, the detection of feeble UWB signals is difficult. In this paper, generating and processing of PPM baseband signals for Ultra Wideband communications is studyed. Meanwhile, high data rate PPM-UWB communication systems have been complemented and tested in indoor short-haul environment.Firstly, the basic concept and characteristic of UWB technology is introduced, And then compositive structure of UWB communication systems are given. Based on the above information, the paper designs the circuit of PPM signal. Meanwhile, presents a novel, simple and realizable scheme of multiple-path parallel synchronization and acquisition according to the characteristics of high-speed PPM-UWB signal and the multi-path model for indoor UWB channels, Which disposes the synchronization cell in baseband circuits, realizes the ideal combination of baseband circuit and RF circuit by multiple-path parallel controllable RF integrator and simplify the design of UWB receiver. By modeling, designing in VHDL, and down-loading the designed programs into a FPGA hardware. Finally, By the research of the generating and the receiving methods of high data rate 100Mbps PPM-UWB signal, a UWB experiment communication system was implemented and tested in indoor environment, the results show that the methods presented in this paper are feasible.更多还原