Joint source channel network coding using QC LDPC codes

Motivated to develop a scheme that compresses, gives high throughput and adds robustness against channel noise, a new joint source channel network coding (JSCNC) using Quasi Cyclic Low Density Parity Check (QCLDPC) code is proposed for a sensor network with two source nodes communicating correlated information to multiple destination nodes. The source coding is performed by transmitting only half of the information bits of QCLDPC code and transmitting the parity bits as such, since the parity bits are usually uncorrelated compared to the corresponding information bits. The correlations in sensor network data are used effectively at the relay node to reconstruct the original information bits transmitted by the source nodes. Relay scheme used in our proposed work is a decode and forward relaying in which masking of information bits are done before network coding at the relay. This helps in low-error decoding at the destination.