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en:group:seminars:20060505 [2009/04/07 11:43]
en:group:seminars:20060505 [2016/06/23 11:26]
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----- dataentry seminar ---- 
-date_dt : 2006-05-05 
-title : Cooperative wireless networks 
-speaker : Dr Frederique Oggier 
-affiliation :  Caltech 
-time :  
-room :  
-table : seminars 
-==== abstract ==== 
-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.