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en:group:seminars:20060505 [2009/04/07 11:17] external edit
en:group:seminars:20060505 [2009/04/07 12:16]
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 ---- dataentry seminar ---- ---- dataentry seminar ----
 date_dt : 2006-05-05 date_dt : 2006-05-05
-title :  +title : Cooperative wireless networks
 speaker : Dr Frederique Oggier speaker : Dr Frederique Oggier
 affiliation :  Caltech affiliation :  Caltech
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 ==== abstract ==== ==== abstract ====
 Recently, attention has been focused on wireless networks. ​ Recently, attention has been focused on wireless networks. ​
 +Methods to exploit diversity using the antennas of different
 +users in a cooperative way have been studied, in order to look
 +for the diversity known to be achieved in the multiple antennas
 +point to point case. We consider a wireless network where a
 +transmitter and a receiver are distinguished,​ with enough
 +computational capacity and power to encode/​decode the data, 
 +and use several antennas to transmit/​receive the signal. ​
 +The other nodes are relays, small devices with few power and 
 +computational ability, with only one antenna (as for example in 
 +sensor networks). In this scenario, it is not realistic to assume ​
 +nodes can decode the information. We thus propose a strategy ​
 +based on the idea of Distributed Space-Time Coding, where the 
 +nodes just do a very simple operation before forwarding the information. ​
 +Our scheme relies on known algebraic Space-Time Codes. It is suitable for
 + any number of transmit/​receive antennas and nodes. It is shown to perform ​
 +better than random codes, with less encoding complexity. We also briefly ​
 +discuss the scenario where nodes may be down in the network, and show 
 +that our strategy is resistant to node failures.
 +{{:​en:​group:​seminars:​frederique1104.pdf|Full presentation}}