Robust Data Compression for Irregular Wireless Sensor Networks Using Logical Mapping
Figure 7
(a) Original and sorted samples. Sorted samples result in a much smoother signal compared to the original samples. (b) Sorted coefficients between DWT and DWT using logical mapping. Nearly half of the coefficients in the DWT-logical mapping are near zero. (c) Normalized MSE versus compression ratio. DWT-logical mapping has a much lower error compared to DWT without logical mapping.