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Towards Ultra-Low Power OFDMA Downlink Demodulation

Published: 24 January 2023 Publication History

Abstract

OFDMA downlink design allowing parallel processing OFDM subcarriers is adopted by a number of commercial wireless standards such as LTE, 5G, and 802.11ax. However, the widespread adoption of OFDMA downlink on low-end IoT devices is stymied due to the existing digital receiver framework's ≈100mW power consumption, which is mainly incurred by LO+mixer, ADC, and complex digital processing. In this paper, we present an ultra-low-power OFDMA downlink demodulation design, which achieves ≈100 μW receiving power. Our basic idea is to transform the current digital demodulation approach into the analog one based on filtering, which avoids those power-hungry components. We achieve this by proposing a series of novel RF front-end hardware designs: 1) a μW-level two-stage mixing scheme that enables adjustable and precise subcarrier filtering, 2) a quartz crystal-based filter circuit incurring negligible insertion loss, and 3) a passive phase-to-envelope conversion technique enabling low-power non-coherent phase demodulation. We build a prototype to verify the proposed schemes. Experimental and IC simulation results show that: our new design can achieve 130 -- 1500 times power savings depending on the number of subcarriers that need to be processed in parallel, compared with the traditional all-digital design.

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      cover image ACM Conferences
      SenSys '22: Proceedings of the 20th ACM Conference on Embedded Networked Sensor Systems
      November 2022
      1280 pages
      ISBN:9781450398862
      DOI:10.1145/3560905
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      • (2024)Willow: Practical WiFi Backscatter Localization with Parallel TagsProceedings of the 22nd Annual International Conference on Mobile Systems, Applications and Services10.1145/3643832.3661853(265-277)Online publication date: 3-Jun-2024
      • (2024)Sisyphus: Redefining Low Power for LoRa ReceiverProceedings of the 30th Annual International Conference on Mobile Computing and Networking10.1145/3636534.3690686(1177-1191)Online publication date: 4-Dec-2024
      • (2024)Towards zero-energy: Navigating the future with 6G in Cellular Internet of ThingsJournal of Network and Computer Applications10.1016/j.jnca.2024.103945230(103945)Online publication date: Oct-2024

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