In this paper, we study the feasibility of a hybrid scheduling approach for broadcast systems infrequency selective fading channels. The hybrid scheduling approach consists of twocomponents: a first broadcast component and a second unicast component. The unicastcomponent is activated if the mobile fails to correctly decode the packet and thus sends back anegative acknowledge to the base station. In this paper, we show that there is an optimalmodulation and coding schemeto be used for each one of the components presented. Thebroadcast optimal modulation and coding scheme depends on the best alignment in fadingbetween different receivers. On the other hand, the unicast optimal modulation and codingscheme depends on the particular fading profile of each mobile separately.
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