Ultra Wideband Channel Model for IEEE 802.15.4a and Performance Comparison of DBPSK/OQPSK Systems

Ultra Wideband (UWB) is a radio technology that can be used at very low energy levels for short-range high-bandwidth communications by using a large portion of the radio spectrum. Ultra Wideband (UWB) systems transmit signals across a much wider frequency than conventional systems and are usually very difficult to detect. The focus of this research is to model the Ultra wideband (UWB) channel for IEEE 802.15.4a. It provides different models for the following frequency ranges and environments. The operating frequency range from 2 GHz to 10 GHz, it covers indoor residential, indoor office, industrial, outdoor and open outdoor environments (Line of sight and Non line of sight properties). For the frequency range from 100 MHz to 900 MHz, it gives a model for indoor office type environments. IEEE 802.15.4a channel model is simulated in MATLAB 7. Under the IEEE802.15.4a channel model, performance of Differential binary phase shift keying (DBPSK) and Offset qudrature phase shift keying (OQPSK) modulations using rake receiver are compared in terms of bit error rates (BERs).