Networking

Fading Broadcast Channels With State Information at the Receivers

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Executive Summary

Despite considerable progress on the information-theoretic broadcast channel, the capacity region of fading broadcast channels with channel state known at the receivers but unknown at the transmitter remains unresolved. The authors address this subject by introducing a layered erasure broadcast channel model in which each component channel has a state that species the received signal levels in an instance of a deterministic binary expansion channel. They find the capacity region of this class of broadcast channels. The capacity achieving strategy assigns each signal level to the user that derives the maximum expected rate from that level. The outer bound is based on a channel enhancement that creates a degraded broadcast channel for which the capacity region is known.

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