Abstract:

This paper will first present an overview of the current state of the art in the measurement and modeling of UWB propagation channels. We will point out the difference between the two main frequency band of interest (less-than 900MHz and 3.1-10.6 GHz), and describe the key channel parameters (attenuation, delay spread, arrival time statistics, amplitude statistics) in different environments. We will especially discuss the difference between "sparse" and "dense" models. We then analyze what channel parameters have the biggest influence on system performance. Various Rake receiver structures, OFDM cyclic prefix duration, and transmitted-reference structures exemplify the systems that show a clear dependence on channel parameters.