Efficient Relaying for Cognitive Radios

Dr Wei Chen; Invited speaker from Tsinghua University

12th August, 2010 at 2.00 pm - AGB Seminar Room, 3rd floor, AGB Building

Internal UoE seminar

Cooperative communications and relaying technologies have recently attracted much attention because of the unprecedented gains, in terms of diversity order or throughput, which they can provide. As an innovative wireless system that can overcome the over allocation and under utilization of the licensed radio spectrum, cognitive radios can particularly benefit from relaying technology, not only because it can provide spatial diversity gain, but also because it can efficiently makes use of the aggregate spatially and/or geographically distributed spectrum holes. In this talk, we are going to present some state-of-the-art relaying techniques that are designed for cognitive radios. It will be shown that proper advanced coding and signal processing methods, namely, rateless coding and distributed beamforming can be adopted into cognitive relaying so as to significantly enhance the spectrum sharing ability of secondary users. We shall also talk about the mathematical tools that can optimize the overall performance of cognitive relaying from a cross-layer perspective. Finally, some recent advances on prototyping of cognitive relaying systems in China’s biggest theoretical CR research project will be presented.