BOPPER: Broadcast-based Peer-to-Peer Error Recovery for Wireless Video

MPhil Thesis Defence


Title: "BOPPER: Broadcast-based Peer-to-Peer Error Recovery for Wireless Video"

By

Mr. Shenjie Li


Abstract

Wireless digital video broadcasting has experienced much growth in recent
years with industrial systems deployed.  In broadcasting, packet loss
adversely affects video quality.  In this work, we propose and study a
novel distributed scheme on how to recover this loss by means of a
broadcast-based secondary channel (using, for examples, IEEE 802.11 or
bluetooth).  Our scheme, termed BOPPER (Broadcast-based Peer-to-Peer Error
Recovery), makes use of the broadcast channel to collaboratively recover
each other's lost packets.  We propose the use of parity packets based on
the possibly subset of source packets received to efficiently recover
errors. In order to reduce the energy consumption in the network, we study
how to minimize the total number of parity generated (and hence
transmitted) while achieving a certain level of recovery capability. We
first consider the case with global knowledge (in peer connectivity, loss
status and pairwise loss rates of all peers), and formulate the problem as
a linear program which can be solved efficiently.  This serves as the
optimal performance of the system.  We then propose and study a scalable,
adaptive and fully distributed algorithm based on local information
exchange to recover packet loss. Simulation results show that our
distributed algorithm achieves close-to-optimum performance, low control
overhead, high recovery capability and fast convergence time.


Date:				Wednesday, 12 March 2008

Time:				2:00p.m.-4:00p.m.

Venue:				Room 3301
				Lifts 17-18

Committee Members:		Dr. Gary Chan (Supervisor)
				Dr. Siu-Wing Cheng (Chairperson)
				Dr. Qian Zhang


**** ALL are Welcome ****