Delay Phased Array

Towards programmable beam-bandwidth for 5G/6G networks

[Infocom 2023] mmFlexible: Flexible Directional Frequency Multiplexing for Multi-user mmWave Networks

[Hotmobile 2023] Poster: Towards Flexible Frequency-dependent mmWave Multi-Beamforming

Authors: Ish Kumar Jain, Rohith Reddy Vennam, Raghav Subbaraman, Dinesh Bharadia

[mmFlexible Paper] [Hotmobile Poster] [slides - coming] [code - coming]

Abstract

Modern mmWave systems have limited scalability due to inflexibility in performing frequency multiplexing. All the frequency components in the signal are beamformed to one direction via pencil beams and cannot be streamed to other user directions. We present a new flexible mmWave system called mmFlexible that enables flexible directional frequency multiplexing, where different frequency components of the mmWave signal are beamformed in multiple arbitrary directions with the same pencil beam. Our system makes two key contributions: (1) We propose a novel mmWave front-end architecture called a delay-phased array that uses a variable delay and variable phase element to create the desired frequency-direction response. (2) We propose a novel algorithm called FSDA (Frequency-space to delay-antenna) to estimate delay and phase values for the real-time operation of the delay-phased array. Through evaluations with mmWave channel traces, we show that mmFlexible provides a 60-150% reduction in worst-case latency compared to baselines.

Other relevant papers

Ish Kumar Jain, Raghav Subbaraman, Dinesh Bharadia. 2021. Two beamsare better than one: Towards Reliable and High Throughput mmWave Links.InACM SIGCOMM 2021 Conference (SIGCOMM ’21), August 23–27, 2021,Virtual Event, USA.ACM, New York, NY, USA, 15 pages. https://doi.org/10.1145/3452296.3472924