Abstract
Q. Zhao and L. Tong
"Energy-Efficient Information Retrieval for
Correlated Source Reconstruction in Sensor Networks"
Submitted to IEEE Transactions on Wireless
Communications
, December, 2004.
We consider information retrieval in a wireless sensor network deployed
for the reconstruction of a spatially correlated signal field.
Referred to as QUality-of-service specific Information REtrieval (QUIRE),
the proposed protocol optimizes the network performance under the metric
of information rate per Joule while ensuring a given QoS. Based on the density
of sensor deployment and the QoS specified by the maximum distortion for
reconstructing the signal field, QUIRE partitions the sensor network into
disjoint and equal-sized cells. The cell size is chosen as such that the signal
field within a cell can be reconstructed for the given QoS from one sample
collected from this cell. By employing opportunistic carrier sensing and an
optimal cell activation scheme, QUIRE
completely eliminates redundant transmissions and fully exploits the channel
reception capability in a fading environment.