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Eliminating Channel Feedback in Next-Generation Cellular Networks

Published: 22 August 2016 Publication History

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.

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    cover image ACM Conferences
    SIGCOMM '16: Proceedings of the 2016 ACM SIGCOMM Conference
    August 2016
    645 pages
    ISBN:9781450341936
    DOI:10.1145/2934872
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    Published: 22 August 2016

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    Author Tags

    1. FDD Systems
    2. LTE

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    SIGCOMM '16: ACM SIGCOMM 2016 Conference
    August 22 - 26, 2016
    Florianopolis, Brazil

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    SIGCOMM '16 Paper Acceptance Rate 39 of 231 submissions, 17%;
    Overall Acceptance Rate 462 of 3,389 submissions, 14%

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    • (2024)HORCRUX: Accurate Cross Band Channel PredictionProceedings of the 30th Annual International Conference on Mobile Computing and Networking10.1145/3636534.3649343(1-15)Online publication date: 29-May-2024
    • (2024)A Two-Stage 2D Channel Extrapolation Scheme for TDD 5G NR SystemsIEEE Transactions on Wireless Communications10.1109/TWC.2024.335121223:8(8497-8511)Online publication date: Aug-2024
    • (2024)FDD Massive MIMO Without CSI FeedbackIEEE Transactions on Wireless Communications10.1109/TWC.2023.331948623:5(4518-4530)Online publication date: May-2024
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