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SUMMARY:(Research) Frequency diversity measurements at 2.4 GHz for wireles
 s sensor networks - Ruoshui Liu
DTSTART:20090505T130000Z
DTEND:20090505T140000Z
UID:TALK17320@talks.cam.ac.uk
CONTACT:Ioannis Chatzigeorgiou
DESCRIPTION:Wireless sensor networks (WSNs) operate primarily in the 2.4 G
 Hz globally compatible ISM band. However\, the wireless propagation channe
 l is notoriously variable and unpredictable\, and it has a significant imp
 act on the coverage range and quality of the radio links between the wirel
 ess nodes. Therefore\, the use of frequency diversity has potential to ame
 liorate this situation. \n\nThis talk will present the method to quantify 
 the possible benefits of using frequency diversity by performing accurate 
 propagation measurements using modified and calibrated off-the-shelf 802.1
 5.4 based sensor motes in the disused underground railway tunnel. Cross co
 rrelation coefficients which are calculated from data gathered during the 
 field measurements suggest that applying frequency diversity will improve 
 link performance in a WSN deployed in a tunnel. This finding was confirmed
  by running a computational simulation of the tunnel radio propagation usi
 ng a 2D Finite-Difference Time-Domain (FDTD) method.
LOCATION:FW26\, William Gates Building
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