Uplink Interference Analysis With RF Switching for Lens–Based Millimeter–Wave Systems

Harsh Tataria, Michail Matthaiou, Peter J. Smith, George C. Alexandropoulos, Vincent F. Fusco

Research output: Chapter in Book/Report/Conference proceedingConference contribution

12 Citations (Scopus)
342 Downloads (Pure)


In this paper, we take a fundamental look at the interference characteristics of a lens–based millimeter–wave multiuser multiple–input multiple–output system. We consider a hybrid architecture, implemented via a bank of radio–frequency (RF) switches which perform beam selection followed by low–complexity uplink maximum–ratio combining at baseband. Considering a Rotman lens antenna array in line–of–sight propagation, we derive tight analytical expressions for the average (expected) interference power of an arbitrary user terminal, with and without the presence of RF switching. Our mathematical expressions show that without RF switching, the Rotman lens losses its benefits and collapses to a conventional uniform linear array. Numerical results demonstrate that the expected interference power of a given terminal decreases significantly with RF switching, due to the beam selection process separating multiple uplink direction–of–arrivals (DoAs). This is in contrast to the case when there is no RF switching, which relaxes the beam selection constraints and thus allows very similar DoAs. Overall, the results in this paper emphasize the necessity of RF switching in order to obtain superior performance with a Rotman lens array, over conventional phased arrays.
Original languageEnglish
Title of host publicationIEEE International Conference on Communications 2018 (ICC 2018): Proceedings
Place of PublicationKansas City, USA
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages7
ISBN (Print)9781538631805
Publication statusPublished - 31 Jul 2018
EventIEEE International Conference on Communications 2018 - Kansas, United States
Duration: 20 May 201824 May 2018

Publication series

NameIEEE International Conference on Communications: Proceedings
ISSN (Electronic)1938-1883


ConferenceIEEE International Conference on Communications 2018
Abbreviated titleIEEE ICC 2018
Country/TerritoryUnited States
Internet address

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering


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