Hierarchical Distributed Source Coding Scheme and Optimal Transmission Scheduling for Wireless Sensor Networks

Unbalanced Threshold Based Distributed Data Collection Scheme in Multisink Wireless Sensor Networks

“…Therefore, the recovered sensed data will be more accurate. Figures 5,6, and 7 show the SNR of reconstructed data, the number of transmitted data, and the number of computed data, respectively, in different surveillance scenarios. The number of uncorrelated two-dimensional Gaussian data sources ranges from 2 to 4.…”

“…Therefore, data collection schemes in wireless sensor network should be light weight and energy efficient. Two representative types of data collection schemes in wireless sensor networks are spatial-temporal correlation based data predication schemes [3][4][5] and distributed source coding schemes [6][7][8].…”

A Three-Phase Top-k Query Based Distributed Data Collection Scheme in Wireless Sensor Networks

“…Output: the sums of each top-| | elements. The initial data set selection phase (1) If node is a member agent node Then (2) Sendsfirst positive and last negative elements in to administrator agent node; (3) Else (4) Computes partial sums for received elements according to (17); (5) ← {the largest positive sums and the smallest negative sums}; (6) Sends to all member agent nodes; The candidate data set selection phase (1) If node is a member agent node Then (2) Finds and in among all elements in the initial data set ; (3) Sends unsent elements in whose values ≥ or ≤ combined with and to the administrator agent node; (4) Else (5) Computes the partial sum for received elements according to (17); (6) ← the th highest positive element; (7) ← the th lowest negative element; (8) Computes upper bounds of whole sum for received elements according to (18); (9) Computes lower bounds of whole sum for received elements according to (19); (10) ← { | ( ) ≥ or ( ) ≤ }; (11) Sends to all member agent nodes; The top-|k| elements selection phase (1) If node is a member agent node Then (2) Sends unsent elements in to administrator agent node; (3) Else (4) Computes whole sums for received elements according to (16); (5) top-| | ← {the largest elements in magnitude};…”

Less is more

“…The outputs of this cooperative game are reduced data redundancy in the network and improved network lifetime. A hierarchical distributed source-coding algorithm combined with an optimal data-transmission strategy is presented in [171]. Two-tier network architecture is utilized to implement a hierarchical distributed source coding algorithm.…”

“…A distributed lifting WT compression algorithm was suggested in [171] to achieve an energy-efficient data aggregation solution. Before compressing sensor node readings, the proposed solution employs spatial correlation among sensor nodes to build and organize sensor nodes into clusters.…”