Theoretical Physics

3 October 2016
Time: 12:00
Location: EC Stoner 8.60

Theoretical Physics Seminar: Raoul Guiazon (UCL)



Improving the performance of wireless networks using Interference Alignment 



 
Abstract : Wireless communication has revolutionised the pace at which information is exchanged. However, today’s communication networks will soon be overwhelmed by the demand for new services such as remote health monitoring systems, location tracking, and the expansion of device-to-device communication which require an increased total throughput of the network and also better security against potential eavesdroppers. Because of the nature of radio waves and radio wave propagation, having more devices in an already cluttered environment will only generate more interference that will ultimately degrade the performance achievable for these devices in future networks. One way to improve the performance of wireless networks to cope with the increased demand in throughput is then to find a better technique than what is currently in use  to mitigate the interference generated by all the devices that will populate the network. This talk will be about such a technique namely Interference Alignment (IA). This impressive technique has been proposed by Cadambe and Jafar in 2008 and was shown to achieve the Degree-of-Freedom of the Interference Channel (IC) meaning that it achieves the best possible performance of the IC at high signal-to-noise ratio. This technique came as a surprise to the entire research community as it showed that instead of splitting the total available ressource (bandwidth)  evenly between all the users in the network as for the current techniques, it was actually possible to give half the total ressource to everyone regardless of their number. Because of that this new approach was called the “Half the cake” approach. 
During the talk I will put the emphasis on my own work which has been to study the performance of IA given the limited precision of practical channel estimation methods.

 

 

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