NDLI: Reception region characterisation using a 2.4GHz direct sequence spread spectrum radio

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Reception region characterisation using a 2.4GHz direct sequence spread spectrum radio

Content Provider	ACM Digital Library
Author	Fedor, Szymon Collier, Martin Brennan, Conor O'Rourke, Damien
Abstract	Experimental studies on Wireless Sensor Networks (WSNs) have revealed the existence of three distinct reception regions. These regions can be classified as connected, transitional, and disconnected. Their location and size may have a significant impact on the performance of communication protocols. The underlying causes for the transitional (or so-called "grey") region have been determined in previous work using both analytical and empirical techniques. Conclusions drawn from these experiments suggest that the transitional region is caused in part by multi-path fading. A natural assumption therefore is that any system used to combat multipath effects will also reduce the extent of the transitional region. Measurements from previous works were mainly carried out on radio architectures using (for example) NRZ and noncoherent FSK and therefore do not validate this assumption. This work shows that the above hypothesis is invalid due to a smaller decay factor and increased standard deviation of the shadowing component for high mulit-path environments. Along with the usual Packet Reception Rate (PRR) tests, a BER test was also undertaken to help identify and characterise the transitional region. A side result of this is that the measured BER shows some deviation from the theoretical value given in the IEEE 802.15.4 standard and provides evidence why RSSI may not be a good link quality estimator in certain circumstances. In addition a number of practical issues encountered and resolved are reported in the paper.
Starting Page	68
Ending Page	72
Page Count	5
File Format	PDF
ISBN	9781595936943
DOI	10.1145/1278972.1278990
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2007-06-25
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Packet reception rate Bit error rate Transitional region
Content Type	Text
Resource Type	Article

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