Ultra wideband channel measurement and transmit reference pulse cluster receiver prototype implementation

Date

2010-06-14T21:22:40Z

Authors

He, Shuai

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Abstract

Ultra wideband (UWB) systems have the potential for extremely high data rate transmission, accurate ranging and positioning. In order to build systems that realize all the potential of UWB, it is first required to understand LT B propagation and the channel properties arising from the propagation. One of the key objectives of this thesis is to explore the characteristics of the UWB indoor channel. Through extensive time domain measurement, the channel reciprocity, spatial correlation, body shadow effect and temporal variation are investigated. Firstly, the existence of channel reciprocity is verified in both baseband and bandpass channels (from 4 GHz to 8 GHz). and channel reciprocity is demonstrated to be frequency independent and distance independent. Secondly, the spatial correlation is investigated on a two dimensional grid, and has been found to follow the trend of a two dimensional Bessel function as spatial distance increases. Thirdly. the interference of the received power and RMS delay spread due to body shadow effect is studied, indicating that the UWB system is highly robust to body shadowing as compared to narrowband systems. Finally. - extensive measurements of the UWB channel's temporal variation in a modern office building under diversified sets of conditions are conducted. A real time measurement is highly robust, to body shadowing as compared to narrowband systems. Finally. extensive measurements of the UWB channel's temporal variation in a modern office building under diversified sets of conditions are conducted. A real time measurement campaign involving mobile scatterers was performed in a typical office environment, hallway environment and lobby environment, to investigate the signal strength fluctuation, temporal correlation and Doppler spread. The analysis of the measurement results provide useful information for UN B system design. transceiver implementation and performance evaluation. The other goal of the thesis is to demonstrate the implementation of the transmitted reference pulse cluster (TRPC) receiver prototype. This prototype modulates data with binary phase shift keyed pulses. communicates over a wireless link using UWB antennas and a wideband direct conversion front-.end. and samples the auto-correlation output of the received signal for demodulation. Commercial off the shelf components are used to build the receiver, and design con¬siderations are introduced for each part of the receiver in detail.

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Keywords

Ultra wideband systems, UWB, Channel, Receivers

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