Capacity Theorems for the Multiple-Access Relay Channel

Outer bounds for the discrete memoryless multiple-access relay channel (MARC) are obtained that exploit the causal relationship between the source and relay inputs. A novel offset encoding technique that facilitates window decoding at the destination is presented for a decode-and-forward strategy, where the relay decodes the source messages before forwarding to the destination. A compress-and-forward strategy for the MARC and an amplify-and-forward strategy for the Gaussian MARC are also presented.

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