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March 24, 2014

Mtg: Information Flow in Wireless Networks: Similarity to Water in Pipes

by @ 9:51 am. Filed under ALL, Communications
 

WEDNESDAY April 23, 2014
SCV Information Theory Chapter
– modeling, max-flow, min-cut, compress-and-forward …
Speaker: Adnan Raja, Ph.D., Fastback Networks
Time: Food and drinks at 5:30 PM; Presentation at 6:00 PM
Cost: none; free parking after 4 PM
Place: Room 202, Packard Bldg, Stanford University, Stanford
RSVP: not required
Web: www.ewh.ieee.org/r6/scv/its

A wired network is modeled as a flow network, which is a directed graph where each edge has a capacity and the flow on each edge cannot exceed the capacity.  This is similar to a commodity network, like traffic in a road system or fluid in pipes. The very well-known max-flow min-cut theorem characterizes the maximum flow from a source terminal to a destination terminal in such a network and also gives an algorithm to schedule an optimal flow.
But what about a wireless network; with say one radio sending information to another distant radio with the help of a multitude of relay nodes?  There are no edges here. Wireless communication is inherently characterized by broadcast of signal from the transmitters and interference of signal at the receiver.
In this talk, I will present our research which characterizes the maximum information flow in a wireless relay network.  Our research shows that for wireless network also there is an analogue to the max-flow min-cut theorem of the wired network.  Our research also gives an approximately optimal scheme for the relay network called the compress-and-forward scheme where each relay node only forwards optimal information to aid the end-to-end communication.

20140423scv

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