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VERSION:2.0
PRODID:-//Memento EPFL//
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SUMMARY:Revisiting Parallel Channels 
DTSTART:20100624T141500
DTSTAMP:20260407T042011Z
UID:4c2199d1cdcdce8ceb5cd290eb7e835a4797afbb500f442ad25dd1d7
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Babak Hossein Khalaj\, Sharif University of Technology\n
 Parallel channels appear in wide range of communication system application
 s\, in addition to optics and electromagnetic propagation. Two main issues
  arising when dealing with parallel channels is\, first\, how to identify 
 the number of available parallel channels\, and second\, how to exploit th
 e existence of such channels in an optimum way. The first question involve
 s finding the so-called Degrees of Freedom of the channel. This number\, f
 or example\, corresponds to the number of sub-carriers in an OFDM system\,
  the rank of channel matrix for a MIMO system\, the number of independent 
 time slots in a fast fading scenario\, and the number of independent route
 s between source and destination in a communication network. After identif
 ying the number of parallel channels\, the second question has been tradit
 ionally addressed by the Waterfilling algorithm which optimizes the transm
 ission rate over different sub-channels for a given total transmission pow
 er. However\, the solution is not trivial when other practical factors suc
 h as delay come into consideration. Another important question also arises
  when diversity and multiplexing trade-offs are taken into account. Extend
 ing such ideas to multiuser scenarios has also been addressed through sche
 mes such as Interference Alignment. In this talk\, after revisiting the ma
 in concepts behind parallel channels\, we will discuss new ideas related t
 o this topic and finally\, present some open problems in this field. \nPro
 f. Khalaj's homepage
LOCATION:BC 01 https://plan.epfl.ch/?room==BC%2001
STATUS:CONFIRMED
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