[CPCC] TALK: Protocols for Two-Way Fading Channels 3/2/09 2-3 PM

[Ender Ayanoglu]

                                 TALK

            Multi-round Protocols for Two-way Fading Channels

                       Prof. Ashutosh Sabharwal
                            Rice University

                          March 2, 2009, Monday
                                  2-3pm
                          Engineering Tower 331


                                ABSTRACT

Interactive communication systems (cellular, WiFi etc) consist of
transceivers, not simply transmitters and receivers. This naturally
leads to a two-way channel, where both nodes in a communication system
share the system resources, and use multi-round protocols to
facilitate communication. Surprisingly, our understanding of this
basic communication construct is rather limited.

In this talk, we will study the two-way fading channels to understand
noise corrupted feedback in communication systems. The noise in the
feedback links leads to mismatch in the shared knowledge of the
transmitter and the receiver, leading to potential outages in
transmission. In the process of analyzing two-way fading channels, we
show that two new concepts of power-controlled feedback and
power-controlled training feedback naturally come up. The analysis
also sheds light on how many bits of information about the channel can
the transmitter and receiver agree upon with high probability.

                           SPEAKER'S BIOGRAPHY

Ashutosh Sabharwal received his B.Tech from Indian Institute of
Technology, New Delhi in 1993. He graduated from The Ohio State
University with a MS in 1995 and PhD in 1999. Currently he is an
Assistant Professor at Rice, where he also the Director of Center for
Multimedia Communication. His main research interests are information
theoretic foundations, protocols and platforms for high performance
wireless networks.

Host: Prof. Syed A. Jafar