Traditional distributed source coding rarely considers the possible linkbetween separate encoders. However, the broadcast nature of wirelesscommunication in sensor networks provides a free gossip mechanism which can beused to simplify encoding/decoding and reduce transmission power. Using thisbroadcast advantage, we present a new two-encoder scheme which imitates theping-pong game and has a successive approximation structure. For the quadraticGaussian case, we prove that this scheme is successively refinable on the{sum-rate, distortion pair} surface, which is characterized by therate-distortion region of the distributed two-encoder source coding. Apotential energy saving over conventional distributed coding is alsoillustrated. This ping-pong distributed coding idea can be extended to themultiple encoder case and provides the theoretical foundation for a new classof distributed image coding method in wireless scenarios.
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