Lower bounds on the rate-distortion function of individual LDGM codes

  title={Lower bounds on the rate-distortion function of individual LDGM codes},
  author={Shrinivas Kudekar and R{\"u}diger L. Urbanke},
  journal={2008 5th International Symposium on Turbo Codes and Related Topics},
We consider lossy compression of a binary symmetric source by means of a low-density generator-matrix code. We derive two lower bounds on the rate distortion function which are valid for any low-density generator-matrix code with a given node degree distribution L(x) on the set of generators and for any encoding algorithm. These bounds show that, due to the sparseness of the code, the performance is strictly bounded away from the Shannon rate-distortion function. In this sense, our bounds… CONTINUE READING
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