Serially-Concatenated Layered Network Coded Cooperation for Wireless Sensor Networks

Low-density generator matrix (LDGM) codes can be generated through instantaneous network topology with XOR operation at each node in original adaptive network coded cooperation (ANCC). Regular LDGM codes exhibit tradeoff nature between error floor and convergence threshold due to the low weight columns in the resulting parity check matrix. In this paper, we propose a scheme called serially-concatenated layered network coded cooperation (SCL-NCC) in order to eliminate the error floor. In our proposed approach, multiple layers of parity bits are generated through the network in a distributed fashion, which form the serially-concatenated LDGM code that can potentially eliminate the error floor at the region of interest. We optimized the parameters by using extrinsic information transfer (EXIT) functions and provide the design examples of SCL-NCC. Also, the effectiveness of our proposed approach will be confirmed via computer simulations.