On the Capacity of One-sided Two user Gaussian Fading Broadcast Channels

Details On the Capacity of One-sided Two user Gaussian Fading Broadcast Channels On the Capacity of One-sided Two user Gaussian Fading Broadcast Channels

2008-10-02

arxiv.org/abs/0810.0503v2

Computer Science

Information Theory

Accepted for publication at Globecom Communications Conference 2008

Scientific paper

In this paper, we investigate upper and lower bounds on the capacity of two-user fading broadcast channels where one of the users has a constant (non-fading) channel. We use the Costa entropy power inequality (EPI) along with an optimization framework to derive upper bounds on the sum-capacity and superposition coding to obtain lower bounds on the sum-rate for this channel. For this fading broadcast channel where one channel is constant, we find that the upper and lower bounds meet under special cases, and in general, we show that the achievable sum-rate comes within a constant of the outer bound.

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