CTH05-2: Rateless Codes for the Gaussian Multiple Access Channel
Urs Niesen, Uri Erez, Devavrat Shah, Gregory W. Wornell · Globecom · 2006
We consider communication over the Gaussian multiple access channel (MAC) with unknown set of active users. The proposed multiple access strategy is distributed and achieves a maximum sum rate point on the boundary of the capacity region for this channel for any set of active users S simultaneously, as if S were known at the transmitters. The proposed coding scheme splits each user into a set of virtual users, each of which can be decoded using a single-user decoder at the receiver instead of having to decode all users jointly. We also present a generalization of this scheme to the case where the channel gains differ between users and each user only knows its own channel gain.