scholarly journals UWB Radio Propagation Measurements in a Desktop Environment

2010 ◽  
Vol 6 (2) ◽  
pp. 74
Author(s):  
Duje Čoko ◽  
Dinko Begušić ◽  
Zoran Blažević
Keyword(s):  
Radio Propagation ◽  
Ultra Wideband ◽  
Delay Spread ◽  
Personal Area Networks ◽  
Network Analyzer ◽  
Wireless Personal Area Networks ◽  
Impulse Responses ◽  
Rms Delay Spread ◽  
Measurement Results ◽  
Uwb Radio

The ultra-wideband wireless personal area networks are expected to be most commonly employed in desktop environments. This paper presents a measurement campaignconducted on a typical office desk. A pair of omnidirectionalUWB antennas and a vector network analyzer were used tomeasure the impulse responses over a frequency rang spanning from 6 GHz to 8.5 GHz, in accordance with the UWB regulations in Europe. The coherence bandwidth and the rms delay spread are calculated from the measurement results. A significant correlation between these wideband parameters is found, but only at higher correlation thresholds.

Baseband Receiver Design for the MBOA Ultra Wideband Wireless Personal Area Networks

2009 ◽  
Vol E92-B (1) ◽  
pp. 143-149
Author(s):  
Sen-Hung WANG ◽  
Chih-Peng LI ◽  
Chao-Tang YU ◽  
Jian-Ming HUANG ◽  
Chua-Chin WANG
Keyword(s):  
Ultra Wideband ◽  
Personal Area Networks ◽  
Receiver Design ◽  
Wireless Personal Area Networks ◽  
Baseband Receiver

scholarly journals Wideband and Ultrawideband Channel Models in Working Machine Environment

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
Attaphongse Taparugssanagorn ◽  
Matti Hämäläinen ◽  
Jari Iinatti
Keyword(s):  
Exponential Decay ◽  
Radio Channel ◽  
Line Of Sight ◽  
Small Scale ◽  
Delay Spread ◽  
Confined Space ◽  
Rms Delay Spread ◽  
Decay Profile ◽  
Cabin Environment ◽  
Uwb Radio

We present statistical models for wideband and ultrawideband (UWB) radio channels in a working machine cabin environment. Based on a set of measurements, it was found that such a small and confined space causes mostly diffuse multipath scattering rather than specular paths. The amplitude of the channel impulse responses in the wideband case is mostly Rayleigh distributed small-scale fading signal, with only a few paths exhibiting Ricean distributions, whereas the ones in the UWB case tend to be log-normally distributed. For the path amplitude, we suggest an exponential decay profile, which has a constant slope in dB scale, with the corresponding parameters for the UWB case. For the wideband case, a twofold exponential decay profile provides excellent fits to the measured data. It was also noted that the root-mean-square (RMS) delay spread is independent of the line-of-sight/obstructed line-of-sight situations of the channel. The multipath components contributing significant energy play a major role in such a small environment if compared to the direct path. In addition, the radio channel gains are attenuated with the presence of a driver inside the cabin.

scholarly journals The Influence Of Propagation Environment On The Accuracy Of Emission Source Bearing

2015 ◽  
Vol 22 (4) ◽  
pp. 591-600 ◽  
Author(s):  
Cezary Ziółkowski ◽  
Jan Marcin Kelner
Keyword(s):  
Normal Distribution ◽  
Direction Finding ◽  
Statistical Properties ◽  
Emission Source ◽  
Delay Spread ◽  
Mutual Relationship ◽  
Spatial Averaging ◽  
Rms Delay Spread ◽  
Transmission Properties ◽  
Measurement Results

Abstract This paper focuses on the radio direction finding (DF) in multipath environments. Based on the measurement results presented in the open literature, the authors analyse the influence of environment transmission properties on the spread of the signal reception angle. Parameters that define these properties are rms delay and angle spreads. For these parameters, the mutual relationship is determined. This relationship is the basis for assessment of the required number of bearings that minimize the influence of the environment on the accuracy of DF procedure. In the presented analysis, the statistical properties of the signal reception angle are approximated by the normal distribution. The number of bearings versus the rms delay spread is presented as the main objective of this paper. In addition, a methodology of the bearings’ spatial averaging that provides better estimation of the reception angle is shown.

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