A Dissertation Submitted To Zhejiang University For The Degree Of Master Of Engineering

The thesis first analyzed the indoor UWB multi-path channel model, gave the parameters of discrete time channel model. Using IEEE 802.15.3a channel model, the signal design of time hopping impulse radio was discussed under multi-path environments. The effects of various impulse waveforms and time hopping parameters on system performance were analyzed.Based on lots of measurements, IEEE 802.15.3a group proposed an indoor UWB channel model for evaluating various proposals. This model is claimed to better match the measurements. However, it is a continuous time model, and the log-normal distribution and the shadowing factor render this model less tractable for theoretical performance analysis and quantification of the channel-induced diversity and coding gains. The continuous time model was sampled in this thesis, and the parameters of the discrete time model were given.The parameter design of time hopping impulse radio (TH-IR) signals, including pulse waveforms and time hopping parameters, was analyzed by a semi-analysis method and Monte Carlo simulation. The influence of the bandwidth and fractional bandwidth of baseband pulse on multi-path fading was simulated. The effects of time hopping parameters on BER performance of a single user TH-IR system using Rake receivers were studied. Given the bit rate of a TH-IR system, the design guidelines of time hopping parameters were proposed to optimize the BER performance.