Joint Multicast-Unicast Design for Multiuser MIMO Networks

Speaker:        Dr. Kate Ching-Ju LIN
                Associate Research Fellow
                Research Center for Information Technology Innovation
                Academia Sinica
                Taiwan

Title:          "Joint Multicast-Unicast Design for Multiuser MIMO
                 Networks"

Date:           Monday, 27 April 2015

Time:           4:00pm - 5:00pm

Venue:          Lecture Theatre F (near lifts 25/26), HKUST

Abstract:

Multi-user MIMO (MU-MIMO) has recently been specified in wireless
standards, e.g., LTE-Advance and 802.11ac, to allow an access point (AP)
to transmit multiple unicast streams simultaneously to different clients.
These protocols however have no specific mechanism for multicasting.
Existing systems hence simply allow a single multicast transmission, as a
result underutilizing the AP's multiple antennas. Even worse, in most of
systems, multicast is by default sent at the base rate, wasting a
considerable link margin available for delivering extra information. To
address this inefficiency, we present the design and implementation of
HybridCast, a MU-MIMO system that enables joint unicast and multicast.
HybridCast efficiently leverages the unused MIMO capability and link
margin to send unicast streams concurrently with a multicast session,
while ensuring not to harm the achievable rate of multicasting. We
evaluate the performance of HybridCast via both testbed experiments and
simulations. The results show that HybridCast always outperforms single
multicast transmission.


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Biography:

Kate Ching-Ju Lin received the BS degree from the Department of Computer
Science, National Tsing Hua University in 2003, and the PhD degree from
the Graduate Institute of Networking and Multimedia, National Taiwan
University in 2009. She was a visiting scholar at CSAIL, MIT from March
2007 to March 2008 and from October 2010 to March 2011. After her
graduation, she joined Research Center for Information Technology
Innovation at Academia Sinica, Taiwan. She is currently an associate
research fellow. Her current research interests include MIMO systems,
wireless multimedia networking, and visible light communications. Dr.
Lin has been actively involved in chairing sessions, and has served as a
TPC member in major conferences, including ACM MOBICOM, USENIX NSDI, IEEE
INFOCOM, etc. She is currently an Editor for Wireless Networks. Dr. Lin
received the Taiwan Ten Outstanding Young Women Award in 2015, the K.-T.
Li Young Researcher Award in 2013, and the MOST Outstanding Young Scholar
Award in 2013. She is a member of the IEEE and ACM.