Date Added: Apr 2013
A network coding-based scheme is proposed to improve the energy efficiency of distributed storage systems in WSNs (Wireless Sensor Networks), which mainly focuses on two problems: firstly, consideration is given to effective distributed storage technology in WSNs; secondly, the authors address how to repair the data in failed storage nodes with less resource. For the first problem, they propose a method to obtain a sparse generator matrix to construct network codes, and this sparse generator matrix is proven to be the sparsest. Benefiting from the sparse generator matrix, the energy consumption required to implement distributed storage is reduced. For the second problem, they designed a network coding-based iterative repair method, which adequately utilizes the idea of re-encoding at intermediate nodes from network coding theory.