Two simplified coding schemes for wireless sensor networks with star topologies

The challenge for wireless sensor networks (WSNs) is to minimize the energy consumption while maintaining user constraints. In this paper, turbo-like (TL) codes with two simplified serial message passing algorithms are proposed for star-WSN. The two algorithms are implemented based on variable node updating. One is the modified sum-product algorithm (MSPA) and the other is the simplified feedback belief propagation algorithm (S-FBPA). The MSPA maintains the performance of the conventional serial sum-product algorithm (SPA), and S-FBPA has the same performance as conventional feed back belief propagation algorithm (FBPA), while both of proposed algorithms have significant complexity reduction.