Time dispersion analysis and capacity for ultra wideband channel in indoor environment

Abstract

In this paper, the ultra wideband (UWB) channel characterisation based on time dispersion analysis is presented. The UWB channel behaviour is different from narrowband and wideband channels due to the large bandwidth, which is the major concern for the channel capacity. In addition, the large bandwidth leads to increased channel variation. The channel characteristics and analysis are important to track the behaviour of UWB channel. The channel measurements were conducted in an indoor environment for UWB system in line-of-sight (LOS) scenario. Time dispersion parameters, namely, root mean squared (RMS) delay spread and mean excess (MN.EX) delay, are analysed based on these measurements. The effectiveness of multipath components is also investigated by means of the multipath gain (MG) and channel capacity. The presented results show that there is a correlation between RMS delay spread and transmitter-receiver (TX-RX) separation distance. The results also show that the best fitting for the RMS delay spread is the Weibull model and the maximum MG is 4.1 dB, which is calculated at the maximum TX-RX separation distance. The channel capacity of multipath components outperforms the capacity of the LOS path by 0.3 bps/Hz.