Title :
The Effect of Local Scattering on the Gain and Beamwidth of a Collaborative Beampattern for Wireless Sensor Networks
Author_Institution :
Electr. Eng., Math., & Comput. Sci. Fac., Delft Univ. of Technol., Delft, Netherlands
fDate :
9/1/2010 12:00:00 AM
Abstract :
Collaborative beamforming is an approach where sensor nodes in a wireless sensor network, deployed randomly in an area of interest, transmit a common message by forming a beampattern towards a destination. Previous statistical analysis of the averaged power beampattern considered multipath-free conditions. Herein, we express the averaged power beampattern when the signal is observed at the destination in the presence of local scattering. Assuming the spreading angles are uniformly distributed around the destination direction, we derive closed-form expressions for the maximum gain and numerically examine the beamwidth as a function of the number of nodes, the cluster size, and the scattering parameters, for node positions with a uniform distribution or a Gaussian distribution.
Keywords :
Gaussian distribution; array signal processing; multipath channels; wireless sensor networks; Gaussian distribution; beamwidth; collaborative beamforming; collaborative beampattern; local scattering; multipath-free conditions; uniform distribution; wireless sensor networks; Array signal processing; Collaboration; Gaussian distribution; Land surface temperature; Remote monitoring; Scattering parameters; Sensor arrays; Statistical analysis; Temperature sensors; Wireless sensor networks; Collaborative beamforming; array beampattern; local scattering; wireless sensor network;
Journal_Title :
Wireless Communications, IEEE Transactions on
DOI :
10.1109/TWC.2010.070710.100263