Eliminating channel feedback in next-generation cellular networks

Deepak Vasisht, Swarun Kumar, Hariharan Rahul, Dina Katabi

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

Abstract

This paper focuses on a simple, yet fundamental question: "Can a node infer the wireless channels on one frequency band by observing the channels on a different frequency band?" This question arises in cellular networks, where the uplink and the downlink operate on different frequencies. Addressing this question is critical for the deployment of key 5G solutions such as massive MIMO, multi-user MIMO, and distributed MIMO, which require channel state information. We introduce R2-F2, a system that enables LTE base stations to infer the downlink channels to a client by observing the uplink channels from that client. By doing so, R2-F2 extends the concept of reciprocity to LTE cellular networks, where downlink and uplink transmissions occur on different frequency bands. It also removes a major hurdle for the deployment of 5G MIMO solutions. We have implemented R2-F2 in software radios and integrated it within the LTE OFDM physical layer. Our results show that the channels computed by R2-F2 deliver accurate MIMO beamforming (to within 0.7 dB of beamforming gains with ground truth channels) while eliminating channel feedback overhead.

Original languageEnglish (US)
Title of host publicationSIGCOMM 2016 - Proceedings of the 2016 ACM Conference on Special Interest Group on Data Communication
PublisherAssociation for Computing Machinery, Inc
Pages398-411
Number of pages14
ISBN (Electronic)9781450341936
DOIs
StatePublished - Aug 22 2016
Externally publishedYes
Event2016 ACM Conference on Special Interest Group on Data Communication, SIGCOMM 2016 - Florianopolis, Brazil
Duration: Aug 22 2016Aug 26 2016

Publication series

NameSIGCOMM 2016 - Proceedings of the 2016 ACM Conference on Special Interest Group on Data Communication

Conference

Conference2016 ACM Conference on Special Interest Group on Data Communication, SIGCOMM 2016
CountryBrazil
CityFlorianopolis
Period8/22/168/26/16

Keywords

  • FDD systems
  • LTE

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Communication
  • Computer Networks and Communications
  • Signal Processing

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