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The data received by the correlator node are transmitted to the clusterhead over distance.
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CORA in Figure 9(c) refers to the energy consumption when original data values, such as 130 in the example above, are sent by the correlator nodes without any differential data transmission.
Let us consider a scenario where the reference data value used by a particular correlator node is 110, and the correlator node has sensor data value of 130.
First, the data are transmitted from to the correlator node over distance, and then sent by correlator node to the clusterhead over distance.
When correlator nodes apply distributed source coding at distance from the clusterhead, sends only nonredundant data to the correlator node which are then forwarded to the clusterhead.
Let be the reference data and be the raw nonredundant data gathered at the correlator node.
Then, the correlator node transmits the differential data with the value.
Clusterhead would then recover the original data 130 using the same reference data value by applying the inverse operator (addition) to the reference data value 110 and the differential data 20 received from the correlator node.
To exploit the correlation in temporal domain, both clusterhead and correlator node maintain a common reference data which captures the characteristic values of last data values transmitted from the correlator node to the clusterhead.
Within each group, the data transmissions from group members to the correlator node are ordered in descending order of node residual energy levels.
The correlator node applies the proposed differential data transmission technique to further reduce the size of the data before sending it to the clusterhead.
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