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SUMMARY:Large-system analysis of multiuser detection with an unknown numbe
 r of users. - Adria Tauste Campo (Department of Engineering)
DTSTART:20080721T150000Z
DTEND:20080721T153000Z
UID:TALK12912@talks.cam.ac.uk
CONTACT:James Cruise
DESCRIPTION:We study multiuser detection where the number\nof users access
 ing the channel is unknown by the receiver. In this\nenvironment user's ac
 tivity must be estimated together with other\nparameters such as data\, po
 wer\, location\, etc. In this paper\, we are\ninterested in the performanc
 e of such systems when the number of\npotential users is large. Under some
  technical\nassumptions\, statistical-physics methodologies can be used fo
 r the\npurpose of determining the macroscopic performance measures of the\
 ndetector (e.g.\, multiuser and spectral efficiency). An\nexpansion of the
  minimum mean-squared error for large signal-to-noise ratio for the joint\
 nestimation of user's activity and their data allows us to analyze\nasympt
 otically the user-and-data MAP detector in terms of multiuser\nefficiency 
 and maximum system load for different quality demands.
LOCATION:MR3\, CMS
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