Dynamic UWB off-body radio channels — Human body shadowing effect
Authors: 
Timo Kumpuniemi, Juha-Pekka Mäkelä, Matti Hämäläinen, Kamya Yekeh Yazdandoost, Jari IinattiAuthors Info & Claims
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Abstract
Dynamic off-body ultra wideband channels are examined by way of anechoic chamber measurements at a 3–5 GHz frequency band in frequency domain with a help of a fast sweeping vector network analyzer. Five antenna locations on the body are selected: right wrist, left wrist with an antenna on the palm or back side, left arm (AL) and left ankle (LA). The off body node is set at a pole (PO). Two in-house designed and manufactured prototype antennas, dipole and double loop, are used in cases with both similar and dissimilar antennas in a link. Depending on the case, the path loss (PL) ranges between 46.2–87.9 dB. The LA-PO has the highest and AL-PO the lowest average PLs. The PL amplitudes follow the inverse Gaussian distribution. Based on the level crossing rate the LA-PO has the deepest fading conditions and the AL-PO is the most stable link. The LA-PO has the largest average fade duration (AFD) at the thresholds below 0 dB. The AFD is larger on the average with the dipole than the double loop. The comparison of similar vs. dissimilar antenna pairs shows no major difference in the performance.
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Oct 2017
3617 pages
ISBN:978-1-5386-3529-2
Copyright © 2017.
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IEEE Press
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Published: 08 October 2017
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