Simplified Log - Likelihood Ratio Calculation for Binary LDPC Codes
Latifa Mostari, Abdelmalik Taleb Ahmed · Journal of Engineering Science and Technology Review · 2017
Combining binary LDPC codes and high order constellations is a simple but effective way to improve the bandwidth efficiency.Since the binary LDPC codes require soft decisions as the input information, the constellation has to provide soft information calculated by Log-Likelihood Ratio (LLR) to it.In this paper, a simplified algorithm to calculate LLR for binary turbo-codes is applied for binary LDPC codes.Simulation results show that the simplified algorithm have a very small performance loss over Gaussian and Rayleigh channels.