Two-way communication with adaptive data acquisition

Abstract

A bidirectional link between two nodes, Node 1 and Node 2, is studied in which Node 2 is able to acquire information from the environment, e.g., via access to a remote data base or via sensing. Information acquisition is expensive in terms of system resources, e.g., time, bandwidth and energy, and thus should be done efficiently. As a result of the forward communication from Node 1 to Node 2, the latter wishes to obtain information about the the data available at Node 1 and of the data obtained from the environment. The forward link is, however, also used by Node 1 to query Node 2 with the aim of retrieving information from the environment on the backward link. The problem is formulated using the concept of side information "vending machine", and the optimal trade-off between communication rates, distortions of the estimates produced at the two nodes and costs for information acquisition at Node 2 is derived.Index Terms-Source coding, side information, interactive communication.

Capacity region of the Gaussian doubly dirty two‐way channel in the presence of partial side information

“…The information‐theoretic study of the two‐way channel (TWC) was initiated by Shannon in where he obtained an inner bound and an outer bound on the DM‐TWC capacity region. Until now, all efforts to determine the capacity region of the DM‐TWC have failed and it sounds that as long as the role of adaptation (the use of past outputs to generate current inputs) is not well‐understood, this problem remains unsolved . Nevertheless, some better capacity bounds than Shannon's bounds have been obtained.…”