Channel modelling and propagation measurements for a bodyworn 5.2 GHz terminal moving in the indoor environment

Channel modelling and propagation measurements for a bodyworn 5.2 GHz terminal moving in the indoor environment

[Abstract]: Proposed applications for broadband wireless local area
networks may include the use of bodyworn or
handportable terminals. The proximity of the user's
body has a significant effect on the radio propagation
characteristics through spatial filtering of the multipath
channel. This paper compares measurements and
simulations of a narrowband 5.2 GHz radio channel
with a fwed transmitter and a bodywom receiver. The
modelling technique was a site-specific ray-tracing
simulator incorporating a modified three-dimensional
radiation pattem of the bodyworn receiver. Two indoor
environments were considered, an 18 m long corridor
and a 42 m* office. The results show that the received
power envelope and local mean values are strongly
dependent. on body shadowing in relation to the direct
ray. In the corridor, 'the predicted non-line-of sight
(NLOS) mean received powers was 13.6 dB lower than
for line-of-sight (LOS). In the office, the predicted
NLOS received power was 5.2 dB lower than LOS. The
measured body shadowing effect was lower: 5.4 dB for
the corridor and 3.8 dB for the office. Further analysis
of level crossing rate and average fade duration showed
that the prediction tool tended to underestimate the
degree of fading. This was attributed to the movement
limitations of the body model used.

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