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.