Date and Time: Monday, Dec 18, 2:30-3:30 pm
Location: Carleton University, 4359 ME (Mackenzie Building)
Title: DESIGN OF THROUGHPUT-EFFICIENT HARQ PROTOCOLS
Speaker: Leszek Szczecinski, Professor, INRS, Montreal
ABSTRACT: In this presentation, we are interested in increasing the
throughput of the physical layer (PHY) when the coded information is
transmitted using equal-length channel blocs which are subject to
independent fading. We consider adaptive modulation and coding (AMC)
and hybrid ARQ (HARQ) and analyse their interaction; in particular, we
explain why the conventional HARQ which reserves the channel blocks to
carry the coded versions of the same information packet, is unable to
increase the throughput in the range of high-SNR. We then discuss
degrees of freedom in the design of HARQ with the main focus being on
the joint encoding/decoding of many packets and on the related design
issues. We show various solutions which lead us to a simple two-layer
encoding where, first, the binary packets compressed, and next, the
results are passed to the conventional channel encoder. This approach
allows us to use off-the-shelf decoders, and the coding rates can be
deduced from the empirical decoding curves.
Speaker Bio: Leszek Szczecinski is Professor at INRS, University of Quebec,
Canada. He obtained M.Eng. degree from the Technical University of
Warsaw in 1992, and Ph.D. from INRS-Telecommunications, Montreal in
1997. From 1998 to 2001, he held position of Assistant Professor at
the Department of Electrical Engineering, University of Chile. In
2009-2010, as a Marie Curie Research Fellow, he was with CNRS, L2S,
Gif-sur-Yvette, France. His research interests are in the area of
communication theory, modulation and coding, ARQ, wireless
communications, and digital signal processing. He coauthored a book
“Bit-Interleaved Coded Modulation: Fundamental, Analysis and Design”
(Wiley, 2015).