This paper quantifies the fundamental limits of variable-length transmission of a general (possibly analog) source over a memoryless channel with noiseless feedback, under a distortion constraint. We consider excess distortion, average distortion and guaranteed distortion (d-semifaithful codes). In contrast to the asymptotic fundamental limit, a general conclusion is that allowing variable-length codes and feedback leads to a sizable improvement in the fundamental delay-distortion tradeoff.
Recently, Kostina et al. REF quantified the minimal average delay (code length) attainable by lossy source-channel codes with feedback and concluded that such codes lead to a significant improvement in the fundamental delay-distortion tradeoff.
Joint source-channel coding with feedback
2015 IEEE International Symposium on Information Theory (ISIT)
2015 IEEE International Symposium on Information Theory (ISIT)
Mathematics Computer Science