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Abstract: In this paper, we investigate upper and lower bounds on the capacity oftwo-user fading broadcast channels where one of the users has a constantnon-fading channel. We use the Costa entropy power inequality EPI alongwith an optimization framework to derive upper bounds on the sum-capacity andsuperposition coding to obtain lower bounds on the sum-rate for this channel.For this fading broadcast channel where one channel is constant, we find thatthe upper and lower bounds meet under special cases, and in general, we showthat the achievable sum-rate comes within a constant of the outer bound.



Author: Amin Jafarian, Sriram Vishwanath

Source: https://arxiv.org/







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