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<p class=MsoNormal style='text-align:justify'><i><u><span style='font-family:
"Calibri","sans-serif"'>Title:<o:p></o:p></span></u></i></p>
<p class=MsoNormal style='text-align:justify'><b><span style='font-size:14.0pt;
font-family:"Calibri","sans-serif"'>Cognitive spectrum sharing through ARQ</span></b><span
style='font-family:"Calibri","sans-serif"'><o:p></o:p></span></p>
<p class=MsoNormal style='text-align:justify'><i><u><span style='font-family:
"Calibri","sans-serif"'>June 21<sup>st</sup> 11:00am E323-D3<o:p></o:p></span></u></i></p>
<p class=MsoNormal style='text-align:justify'><i><u><span style='font-family:
"Calibri","sans-serif"'><o:p><span style='text-decoration:none'> </span></o:p></span></u></i></p>
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"Calibri","sans-serif"'><o:p><span style='text-decoration:none'> </span></o:p></span></u></i></p>
<p class=MsoNormal style='text-align:justify'><i><u><span style='font-family:
"Calibri","sans-serif"'>Speaker:<o:p></o:p></span></u></i></p>
<p class=MsoNormal style='text-align:justify'><span style='font-family:"Calibri","sans-serif"'>Wei
Zhang<o:p></o:p></span></p>
<p class=MsoNormal style='text-align:justify'><span style='font-family:"Calibri","sans-serif"'>The
University of New South Wales<o:p></o:p></span></p>
<p class=MsoNormal style='text-align:justify'><span style='font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-align:justify'><i><u><span style='font-family:
"Calibri","sans-serif"'>Abstract:<o:p></o:p></span></u></i></p>
<p class=MsoNormal style='text-align:justify'><span style='font-family:"Calibri","sans-serif"'>In
this talk, an opportunistic sharing scheme, referred to as Spectrum sHaring
with ARQ Retransmissions and Probing (SHARP), is introduced for cognitive radio
networks. We consider a pair of cognitive radio users co-existing with a pair
of ARQ-based primary users. The cognitive user overhears the ARQ feedback sent
from the receiver of the primary system, and then selects an appropriate
transmission mode to access the primary channel. The proposed SHARP approach
aims to exploit various spectrum sharing opportunities based on the ACK/NACK of
primary users only. Analytical achievable throughput is derived and it is
demonstrated that the performance of cognitive radio system increases
dramatically by employing SHARP.</span><o:p></o:p></p>
<p class=MsoNormal style='text-align:justify'> <o:p></o:p></p>
<p class=MsoNormal style='text-align:justify'><b><span style='font-family:"Calibri","sans-serif";
color:black'>Wei Zhang </span></b><span style='font-family:"Calibri","sans-serif";
color:black'>received the B.S and M.S degrees from Jilin University, China, in
1998 and 2002, respectively, and Ph.D. degree in Electronic Engineering from
The Chinese University of Hong Kong in 2005. He was a Research Fellow at the
Department of Electronic and Computer Engineering, Hong Kong University of
Science and Technology in 2006-2007. Since 2008, he has been with the School of
Electrical Engineering and Telecommunications, The University of New South
Wales, Sydney, Australia, where he is a Senior Lecturer. His current research
interests include cognitive radio, cooperative communications, space-time
coding, and multiuser MIMO. He received the best paper award at the 50th IEEE
Global Communications Conference (GLOBECOM’07), Washington DC in 2007 and the
IEEE Communications Society Asia-Pacific Outstanding Young Researcher Award in
2009. He serves co-chair of Communications Theory Symposium of ICC 2011.<o:p></o:p></span></p>
<p class=MsoNormal style='text-align:justify'><span style='font-family:"Calibri","sans-serif";
color:black'><o:p> </o:p></span></p>
<p class=MsoNormal style='text-align:justify'><span style='font-family:"Calibri","sans-serif";
color:black'>E-mail: </span><span style='font-family:"Calibri","sans-serif";
color:blue'>wzhang@ee.unsw.edu.au<o:p></o:p></span></p>
<p class=MsoNormal style='text-align:justify'><span style='font-family:"Calibri","sans-serif";
color:black'>Web: </span><span style='font-family:"Calibri","sans-serif";
color:blue'>www.ee.unsw.edu.au/~wzhang/</span><span style='font-family:"Calibri","sans-serif"'><o:p></o:p></span></p>
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