Carrier and sampling frequency offset estimation for RF communication with crystal-less nodes
Abstract
When the ultra-low power mm-scale sensor node does not have a crystal oscillator and phase-lock loop, it inevitably exhibits significant carrier frequency offset (CFO) and sampling frequency offset (SFO) with respect to the reference frequencies in the gateway. This disclosure enables efficient real-time calculation of accurate SFO and CFO at the gateway, thus the ultra-low power mm-scale sensor node can be realized without a costly and bulky clock reference crystal and also power-hungry phase lock loop. In the proposed system, the crystal-less sensor starts transmission with repetitive RF pulses with a constant interval, followed by the data payload using pulse-position modulation (PPM). A proposed algorithm uses a two-dimensional (2D) fast Fourier transform (FFT) based process that identifies the SFO and CFO at the same time to establish successful wireless communication between the gateway and crystal-less sensor nodes.
- Inventors:
- Issue Date:
- Research Org.:
- Univ. of Michigan, Ann Arbor, MI (United States)
- Sponsoring Org.:
- USDOE; Defense Advanced Research Projects Agency (DARPA)
- OSTI Identifier:
- 1986794
- Patent Number(s):
- 11496174
- Application Number:
- 17/162,056
- Assignee:
- The Regents of the University of Michigan (Ann Arbor, MI)
- DOE Contract Number:
- FA8750-18-C-0134; HR001118C0043
- Resource Type:
- Patent
- Resource Relation:
- Patent File Date: 01/29/2021
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Kim, Hun-Seok, Hsu, Chin-Wei, Blaauw, David T., and Kempke, Benjamin. Carrier and sampling frequency offset estimation for RF communication with crystal-less nodes. United States: N. p., 2022.
Web.
Kim, Hun-Seok, Hsu, Chin-Wei, Blaauw, David T., & Kempke, Benjamin. Carrier and sampling frequency offset estimation for RF communication with crystal-less nodes. United States.
Kim, Hun-Seok, Hsu, Chin-Wei, Blaauw, David T., and Kempke, Benjamin. Tue .
"Carrier and sampling frequency offset estimation for RF communication with crystal-less nodes". United States. https://www.osti.gov/servlets/purl/1986794.
@article{osti_1986794,
title = {Carrier and sampling frequency offset estimation for RF communication with crystal-less nodes},
author = {Kim, Hun-Seok and Hsu, Chin-Wei and Blaauw, David T. and Kempke, Benjamin},
abstractNote = {When the ultra-low power mm-scale sensor node does not have a crystal oscillator and phase-lock loop, it inevitably exhibits significant carrier frequency offset (CFO) and sampling frequency offset (SFO) with respect to the reference frequencies in the gateway. This disclosure enables efficient real-time calculation of accurate SFO and CFO at the gateway, thus the ultra-low power mm-scale sensor node can be realized without a costly and bulky clock reference crystal and also power-hungry phase lock loop. In the proposed system, the crystal-less sensor starts transmission with repetitive RF pulses with a constant interval, followed by the data payload using pulse-position modulation (PPM). A proposed algorithm uses a two-dimensional (2D) fast Fourier transform (FFT) based process that identifies the SFO and CFO at the same time to establish successful wireless communication between the gateway and crystal-less sensor nodes.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2022},
month = {11}
}
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