Shannon capacity is a measure of long term average throughput. Coding schemes that approach this capacity will have large delays, especially for slowly fading channels. Shannon capacity may thus not be ameaningful measure for delay-constraied applications. Outage capacity has been introduced in the literature as an alternate caacity measure. We formulate an extension fo the notion of outage capacity to channels with feedback. This formulation permits us to compare meaingfully the performance of various transmit power and rate contro lalgorthms for delay-constrained applications. We show that feedback significatly increases outage capacity, as opposed to the modest increase it provides in shannon capacity.
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