[CPCC] SEMINAR: Physical Layer Collision Resolution in WLANs 3/1 10 AM

Ender Ayanoglu ayanoglu at uci.edu
Wed Feb 24 11:34:59 PST 2010


                              CPCC SEMINAR

             Multiple Packet Reception in Wireless Networks

                                   by

                              Sanaz Barghi

                        March 1, 2010, Monday
                                 10 AM
                        Engineering Gateway 3161


                                  ABSTRACT

In this talk, a new cross-layer MAC/PHY design based on IEEE 802.11
wireless local area networks (WLANs) with hidden terminals will be
presented.  In WLANs with hidden terminals, not all terminals can hear
each other and multiple RTS packets may arrive at an access point (AP)
with varying time offsets complicating the issue of collision
handling.  Our proposed design utilizes a multiple-packet reception
(MPR) algorithm that can minimize the number of dropped packets by
resolving collisions in the PHY layer. Such design has two components:
a multiple-input multiple-output (MIMO) MPR PHY that operates based on
space-time codes, and a compatible MPR-aware MAC as an upgrade to IEEE
802.11 with RTS/CTS signaling. The MPR PHY detects multiple
asynchronous packets while providing diversity gain. The MPR-aware MAC
framework is tuned to maximally benefit from multiple packet delivery
and to accept multiple RTS packets with large offsets. Simulation
results show that with our proposed PHY/MAC framework, the throughput
of a WLAN reaches more than twice that of IEEE 802.11 in many
scenarios of operation.

                          SPEAKER'S BIOGRAPHY

Sanaz Barghi received the B.Sc. and M.Sc. degrees in Electrical
Engineering from Sharif University of Technology , Tehran, Iran in
2005 and 2007. She is currently working toward the Ph.D. degree in
University of California, Irvine. Her research interests include
wireless communications and cross layer designs.


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