Partial DCT-based energy efficient compression algorithm for wireless multimedia sensor network

Recent advancement in hardware technology provides sensor nodes capable to process multimedia signal. However, the strict limitations in terms of processing power, storage, bandwidth etc. pose a great challenge to data processing in wireless multimedia sensor network (WMSN). In this paper we propose an energy saving audio data compression technique for WMSN using partial DCT (PDCT), where only the last DCT coefficient is propagated thereby saves energy by transmitting reduced number of bits. We have considered an application domain where data are co-related and we have also considered a 2D architecture where nodes are randomly placed. Along with the proposed PDCT based scheme a tree based routing scheme is also proposed with an aim to reduce energy consumption further. The design feasibility along with simulation results evaluate efficacy of the scheme in terms of two conflicting parameters viz. energy consumption and SNR. The comparative results confirm our scheme´s supremacy over the competing scheme.