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SUMMARY:Connectivity Properties of Cooperative Wireless Ad Hoc Networks - 
 Don Towsley\, University of Massachusetts Amherst and Microsoft Research C
 ambridge
DTSTART:20090603T140000Z
DTEND:20090603T150000Z
UID:TALK18455@talks.cam.ac.uk
CONTACT:Sarah Lilienthal
DESCRIPTION:Extensive research has demonstrated the potential improvement 
 in\nphysical layer performance when multiple radios transmit concurrently 
 in\nthe same radio channel. We consider here how such cooperation\naffects
  the required node density for full connectivity and percolation\nfor vari
 ous path loss exponents (PLEs) in large wireless ad hoc\nnetworks.  For on
 e-dimensional (1-D) extended networks\, in contrast to\nnoncooperative net
 works\, full connectivity occurs for any node density\nwhen the PLE <= one
 .  Conversely\, there exist unconnected nodes with\nprobability one when P
 LE > 1\, and the network does not percolate for any\nnode density if PLE >
  2. The existence of percolation remains an open\nproblem for 1 < PLE <= 2
  in the one-dimensional (1-D) case. In\ntwo-dimensional (2-D) extended net
 works with noncoherent cooperation\,\nfull connectivity is achieved for an
 y node density with PLE <= 2.\nConversely\, there exist disconnected nodes
  with probability one when PLE\n > 2\; however the cooperative network per
 colates for node densities\nabove a threshold which is strictly less than 
 that of the noncooperative\nnetwork.\n\nThe above results hold when in the
  presence of receiver cooperation.\nWe also present results for the case t
 hat senders cooperate whereas\nreceivers do not.\n\nJoint work with D. Goe
 ckel\, B. Liu\, L. Wang\, C. Westphal
LOCATION:MR12\, CMS\, Wilberforce Road\, Cambridge\, CB3 0WB
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