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On the degrees of freedom of two-hop MISO broadcast networks with mixed CSIT
KTH, School of Electrical Engineering (EES), Communication Theory.
KTH, School of Electrical Engineering (EES), Communication Theory.ORCID iD: 0000-0002-5407-0835
KTH, School of Electrical Engineering (EES), Communication Theory.ORCID iD: 0000-0002-7926-5081
2013 (English)In: 2013 IEEE Global Communications Conference (GLOBECOM), IEEE , 2013, 1909-1914 p.Conference paper (Refereed)
Abstract [en]

We consider a downlink two-hop MISO broadcast network with a 2-antenna source communicating to 2 single-antenna destinations, via 2 single-antenna relays. We investigate spectrally efficient transmission and the associated achievable sum degrees of freedom (DoF) with mixed channel state information at the transmitter (CSIT), which consists of perfect delayed CSIT and imperfect instantaneous CSIT. When the variance of the estimation error of the instantaneous CSIT lies on level of O(P-α) for the transmission power P and some α [0, 1], we show that the sum DoF 4-2α over 3-2α [4 over 3, 2] can be achieved by a novel interference alignment (IA) scheme. The result shows that rather than exploiting only delayed or imperfect instantaneous CSIT, the transmission design taking advantages of both can achieve higher sum DoF.

Place, publisher, year, edition, pages
IEEE , 2013. 1909-1914 p.
Keyword [en]
Antennas, Communication, Mechanics, Broadcast Networks, Delayed CSIT, Estimation errors, Interference alignment, Mixed channel, Transmission design, Transmission power, Degrees of freedom (mechanics)
National Category
URN: urn:nbn:se:kth:diva-151004DOI: 10.1109/GLOCOM.2013.6831353ScopusID: 2-s2.0-84904097545ISBN: 978-147991353-4OAI: diva2:746228
2013 IEEE Global Communications Conference, GLOBECOM 2013, 9 December 2013 through 13 December 2013, Atlanta, GA, United States

QC 20140912

Available from: 2014-09-12 Created: 2014-09-12 Last updated: 2014-09-12Bibliographically approved

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Wang, ZhaoXiao, MingSkoglund, Mikael
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