Dynamic Rate Adaptation for Improved Throughput and Delay in Wireless Network Coded Broadcast
Dr. Parastoo Sadeghi (Australian National University)
APPLIED SIGNAL PROCESSING SERIESDATE: 2013-08-22
TIME: 10:00:00 - 11:00:00
LOCATION: RSISE Seminar Room, ground floor, building 115, cnr. North and Daley Roads, ANU
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ABSTRACT:
We present theoretical and simulation-based study of the delivery delay performance of a number of existing throughput-optimal network coding schemes and use the results to design a new dynamic rate adaptation scheme which achieves improved overall throughput-delay performance. Under a baseline rate control scheme, the receiversa delay performance is examined and three distinct methods for packet delivery are identified: zero state, leader state and coefficient-based delivery. We provide analyses of each delivery method and show that in many cases zero state delivery alone presents a tractable approximation of the expected packet delivery behavior. We also show how well-chosen network coding coefficients can contribute a significant improvement to the delay. Based on our delivery delay model, we develop a dynamic rate adaptation scheme, which uses performance prediction models based on the knowledge difference between the sender and receiver to determine the sender transmission rate. We show that this scheme results in noticeably improved throughput-delay performance over existing schemes in the literature.
BIO:
Parastoo Sadeghi received her BE and ME degrees from Sharif University of Technology in 1995 and 1997, respectively. After working in R&D sector for about 5 years, she completed her PhD degree in 2006 at the University of New South Wales, Sydney, Australia. She is currently a Fellow in the Research School of Engineering, at the Australian National University, Canberra. She has published over 90 refereed journal and conference papers and a recent book on Hilbert space methods in signal processing. Her research interests include wireless communication, network coding and signal processing. She is a Senior Member of the IEEE.
