Broadcasting Data to Multiple User Groups: Information Theoretic Investigation of the wide Band Case

Broadcast (or point to multipoint) communication has attracted a lot of research recently. In this talk, we consider the group broadcast channel where the users' pool is divided into groups, each of which is interested in common information. Such a situation occurs for example in digital audio and video broadcast where the users are divided into various groups according to the shows they are interested in. In this scenario, the system capacity can be shown to be inversely proportional to the number of users in each group.
As such, the talk considers wideband group broadcast channels in which the bandwidth is to increase with the number of users so as to guarantee constant information rate per user. The talk raises some information theoretic questions about the wideband group broadcast channel and how it behaves for large number of users and for wide bandwidth.