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On the effect of imperfect timing synchronization on pilot contamination
KTH, Skolan för elektro- och systemteknik (EES), Teknisk informationsvetenskap. KTH, Skolan för elektro- och systemteknik (EES), Centra, ACCESS Linnaeus Centre.
2017 (Engelska)Ingår i: 2017 IEEE International Conference on Communications, ICC 2017, Institute of Electrical and Electronics Engineers (IEEE), 2017, artikel-id 7996671Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

The phenomenon of pilot contamination (PC) in multi-cell Massive MIMO systems is investigated in the presence of imperfect timing synchronization (TS). In particular, a basic setup is considered, where a base station (BS) is perfectly synchronized with the user of its cell, but there is imperfect TS between the BS and the user in another cell, possibly due to different propagation distances. A discrete-time system model is derived based on the continuous-time system model. The discrete-time system model accurately captures the phenomenon of imperfect TS in terms of the timing mismatch and the pulse shaping filter impulse responses. The derived discrete-time system model is used to study the achievable rates of a two-cell Massive MIMO uplink. It is shown that the structure imposed to the pilot contaminating signal due to the imperfect TS can be leveraged to mitigate the effect of PC. The level of PC suppression is quantified as a function of the timing mismatch and the characteristics of the transmit/receive pulse shaping filters.

Ort, förlag, år, upplaga, sidor
Institute of Electrical and Electronics Engineers (IEEE), 2017. artikel-id 7996671
Serie
IEEE International Conference on Communications, ISSN 1550-3607
Nyckelord [en]
Massive Mimo, Channel Estimation, Systems, Wireless
Nationell ämneskategori
Reglerteknik
Identifikatorer
URN: urn:nbn:se:kth:diva-213941DOI: 10.1109/ICC.2017.7996671ISI: 000424872102031Scopus ID: 2-s2.0-85028306741ISBN: 9781467389990 (tryckt)OAI: oai:DiVA.org:kth-213941DiVA, id: diva2:1140197
Konferens
2017 IEEE International Conference on Communications, ICC 2017, Paris, France, 21 May 2017 through 25 May 2017
Forskningsfinansiär
Vetenskapsrådet
Anmärkning

QC 20170911

Tillgänglig från: 2017-09-11 Skapad: 2017-09-11 Senast uppdaterad: 2018-03-12Bibliografiskt granskad

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