Broadcast Channels With 3 Or More Receivers
of Information Engineering
Chinese University of Hong Kong
Jan 14, 2008
4:00p.m. - 5:00p.m.
Rm. 1009 William MW Mong Engineering Building,
channel refers to a scenario in multi-user information
theory where one sender wishes to simultaneously transmit
independent pieces of information to different receivers
or groups of receivers over a channel that introduces
errors. The problem of computing the capacity region
remains open even for the simplest case of two receivers
requiring independent messages. However the optimal
regions are known for lots of important and interesting
special cases as well as good inner and outer bounds
for the general 2-receiver case.
natural question here is whether 3 or more receivers
is a straightforward extension of the two receivers
at least in special cases of interest.
this talk I shall show, using an important special
case, that such straightforward extensions are not
optimal. We introduce a new technique, called indirect
decoding, that can be combined with existing techniques
to improve the capacity region. Further, combining
this technique with the existing techniques a new
coding technique emerges for a general broadcast channel
with 3 or more receivers which adds to our understanding
of even the 2-receiver case.
is joint work with: Prof. Abbas El Gamal, Stanford
The main results in this talk is quite new and can
be found either from my webpage:
or reference: http://arxiv.org/abs/0712.3327