Secret-key agreement over a non-coherent block-fading MIMO wiretap channel
2012 (English)In: Information Theory Workshop (ITW), 2012 IEEE, IEEE , 2012, 153-157 p.Conference paper (Refereed)
We study secret-key agreement over a non-coherent block-fading multiple input multiple output (MIMO) wiretap channel. We give an achievable scheme based on training and source emulation and analyze the rate in the high SNR regime. Based on this analysis we find the optimal number of antennas to use for training. Our main result is that if the sum of the number of antennas at Alice and Bob is larger than the coherence time of the channel, the achievable rate does not depend on the number of antennas at Eve. In this case source emulation is not needed, and using only training is optimal. We also consider the case when there is no public channel available. In this case we show that secret-key agreement is still possible by using the wireless channel for discussion, giving the same number of secure degrees of freedom as in the case with a public channel.
Place, publisher, year, edition, pages
IEEE , 2012. 153-157 p.
Common Randomness, Communication, Information
IdentifiersURN: urn:nbn:se:kth:diva-117768DOI: 10.1109/ITW.2012.6404646ISI: 000313526400033ScopusID: 2-s2.0-84873135872ISBN: 978-146730223-4OAI: oai:DiVA.org:kth-117768DiVA: diva2:602973
IEEE Information Theory Workshop, ITW 2012; Lausanne; 3 September 2012 through 7 September 2012
QC 201302202013-02-042013-02-042013-03-05Bibliographically approved