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We consider the Cascade and Triangular ratedistortion problems where the same side information is available at the source node and User 1, and the side information available at User 2 is a degraded version of the side information at the source node and User 1. We characterize the rate-distortion region for these problems. For the Cascade setup, we showed that, at User 1, decoding and re-binning the codeword sent by the source node for User 2 is optimum. We then extend our results to the Two way Cascade and Triangular settings, where the source node is interested in lossy reconstruction of the side information at User 2 via a rate limited link from User 2 to the source node. We characterize the rate distortion regions for these settings. Next, we evaluate our regions in the Quadratic Gaussian Cascade and Triangular settings, and obtain characterizations of these settings in the form tractable low dimensional optimization problems.

Cascade, Triangular and two way source coding with degraded side information at the second user