Research Article
Robust Data Compression for Irregular Wireless Sensor Networks Using Logical Mapping
Pseudocode 1
Pseudocode for 1-dimensional DCT transform. From lines
to
, a sensor calculates only the coefficient that corresponds to the sensor virtual index
.
| //Broadcast local reading to | | //the cluster | | broadcast (reading) | | | | //collect neighbors’ reading in | | //specified interval | | while not timeout | | do | | data [packet·virtual index] | | = packet·reading | | | | //Compression with DCT transform | | //Calculate only row of ⋆ data | | // is the virtual index of this node | | for ← to cluster_dim | | coeffcoeff + [] [] ⋆ data [] | | | | //Quantization | | coeff = round (coeff/) | | | | //Only transmit a nonzero coefficient | | if coeff ! = 0 | | send (coeff) |
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