Ergodic interference alignment with noisy channel state information
2013 (English)In: 2013 IEEE International Symposium on Information Theory Proceedings (ISIT), IEEE conference proceedings, 2013, 584-588 p.Conference paper (Refereed)
We investigate the multi-user time-varying Gaussian interference channel (IC) in which each source desires to communicate to an intended destination. For the ergodic time-varying IC with global perfect CSI at all terminals, it is known that with an interference alignment technique each source-destinationpair can communicate at half of the interference-free achievable rate. In practice, the channel gains are estimated by transmitting known pilot symbols from the sources, and the channel estimation procedure is hence prone to errors. In this paper, we model the channel estimation error at the destinations by an independent additive Gaussian noise and study the behavior of the ergodic interference alignment scheme with the global noisy CSI at all terminals. Toward this end, we present a closed-form innerbound on the achievable rate region by which we conclude that the achievable degrees of freedom with global perfect CSI is preserved, if the variance of channel estimation error is proportional to the inverse of the transmitted power.
Place, publisher, year, edition, pages
IEEE conference proceedings, 2013. 584-588 p.
Wireless communication, interference networks, interference alignment
Communication Systems Telecommunications Signal Processing
Research subject SRA - ICT
IdentifiersURN: urn:nbn:se:kth:diva-121338DOI: 10.1109/ISIT.2013.6620293ISI: 000348913400118ScopusID: 2-s2.0-84890350486ISBN: 978-147990446-4OAI: oai:DiVA.org:kth-121338DiVA: diva2:618480
ISIT 2013 IEEE International Symposium on Information Theory; Istanbul, Turkey, 7-12 July 2013
QC 201308272013-04-282013-04-282015-12-04Bibliographically approved