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Research on Key Technique and Hardware Design of Chirp-UWB System

Author: GaoShen
Tutor: LiuLuoZuo
School: PLA Information Engineering University
Course: Military Communication
Keywords: Ultra-Wideband Linear FM Direct Digital Synthesis Phase-locked loop Frequency multiplication Active spectral compression Non - ideal factors
CLC: TN925
Type: Master's thesis
Year: 2009
Downloads: 58
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Abstract


At home and abroad on the ultra-wideband mainly for short-distance, high-speed applications, less involved in long-distance applications. Based on the long-range ultra-wideband wireless transmission technology can further expand the range of applications of ultra-wideband, to make it more flexible application form, architecture is more complete. In particular its technical advantages inherent ability of anti-interference and transmission concealed, in public security, fire protection, disaster relief and other special areas where important applications. A variety of ultra-wideband communication system, Chirp-UWB system used in long-distance communication has its unique advantages. However, practical Chirp-UWB technology is mainly located in the short-range, low-rate, low-cost applications. So research applicable to distance Chirp-UWB system structure and related key technologies meaningful. The main work of this paper is as follows: first, Chirp-UWB signal generation technology. Based analog VCO and its non-linear correction, direct digital synthesis (DDS), the DDS phase locked loop, DDS frequency multiplier of four signal generation scheme, a detailed analysis of their own performance and applied Chirp-UWB communication system is feasible sex. The study showed that, based on the the DDS frequency multiplier variable frequency signal generating program combines the advantages of both analog and digital signal generation technique is a better bandwidth Chirp-UWB signal generating program. Chirp-UWB signal acquisition and processing technology. First study the implementation of high-speed digital processing, high-speed ADC Chirp-UWB signal is sampled and then gives an active spectral compression combined with the implementation of the low-speed ADC sampling. Latter program uses multiplying the time domain to the frequency domain, the great bandwidth Chirp signal is compressed into a narrow-band signal, avoiding the high-speed sampling and high-speed digital signal processing, is an effective Chirp-UWB signal acquisition and processing program. Third, Chirp-UWB system hardware implementation of non-ideal factor analysis. Chirp-UWB for a practical implementation structure, sources of non-ideal factors from the perspective of project implementation, through the establishment of a mathematical model to study its impact on system performance, and gives eliminate or reduce the solution of these factors and ideas. Finally, based on the above study, the select the DDS frequency multiplier signal generator program and active spectral compression receiver structure, design Chirp-UWB system baseband and RF transceiver circuit.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Radio relay communications,microwave communications
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