A framework for joint source-channel coding using factor graphs. I. Kozintsev R. Koetter and K. Ramchandran. A FRAMEWORK FOR JOINT SOURCE-CHANNEL CODING USING FACTOR GRAPHS

We propose a novel factor graph framework for joint source-channel coding for communication with a-delity criterion. We consider a class of source models that are used in current state-of-the-art transform image coding schemes. We construct a global graph-ical model that includes both the channel coding redundancy and the source model and we apply the sum-product algorithm to estimate the transmitted signal with minimum distortion. Our results show the promise of our framework for improving over existing techniques by exploiting the residual redundancy in the source after the source coding.