By M. Matin
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Extra info for Ultra Wideband Communications - Novel Trends, Antennas and Propagation
Sample text
A large number of references, more than 100 and mostly recently published, are used in this investigation. The basic channel characterization parameters are extracted and discussed. We review all the channel characterization procedures in this regard. To characterize a UWB propagation indoor channel, a common method is applying a Radio-Frequency (RF) signal to the channel and making an empirical evaluation of the received signal. Through this type of channel characterization, essential metrics are drawn which are: Path-Loss (PL), large-scale fading, small-scale fading, multipath arrival rate, Power-Delay-Profile (PDP), Root-Mean-Squared (RMS) delay spread, temporal correlation, Angle-of-Arrival (AOA), spatial correlation across the receiver’s spatial aperture, Frequency-Selectivity (FSE) and Pulse-Distortion (PD).
D > D. All these values are calculated through the curve-fitting process on the measured data. 3) There is no significant difference between the measured values of n for UWB channels and narrowband indoor channels which are reported in (13). 4) The path-loss in a ship compartment area follows in-building LOS (within one room) cases. 5) The path-loss exponent n slightly increases if directional antennas are employed for the receiver and transmitter (46)-(51) because it reduces some of the obstructive effects of objects distributed between transmitter and receiver like diffraction, reflection and absorption.
One can write m = α log10 k a where α is real positive value. Substituting this linear function into (17) yields | H ( f )| = k a f −α log10 k a F (18) As seen | H ( f )| is no longer a linear function of k a and therefore deviates from the simple power law. Lao et al. (44) show how the transmission coefficients with amplitude and phase information change for different building materials.