Adaptive Demodulation for Wireless Systems in the Presence of Frequency-Offset Estimation Errors

Hanif Rahbari, Peyman Siyari, Marwan M Krunz, Jung Min Jerry Park

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

1 Citation (Scopus)

Abstract

Carrier frequency offset (CFO) arises from the intrinsic mismatch between the operating frequencies of the transmitter and the receiver, as well as their relative speeds (i.e., Doppler effect). Despite advances in CFO estimation techniques, estimation errors are still present. Residual CFO creates time-varying phase error. Modern wireless systems, including WLANs, 5G cellular systems, and satellite communications, use high-order modulation schemes, which are characterized by dense constellation maps. Accounting for the phase error is critical for the demodulation performance of such schemes. In this paper, we analyze the post-estimation probability distribution of residual CFO and use it to develop a CFO-aware demodulation approach for a set of modulation schemes (e.g., QAM and APSK). For a given distribution of the residual CFO, symbols with larger amplitudes are less densely distributed on the constellation map. We explore one important application of our adaptive demodulation approach in the context of PHY-layer security, and more specifically modulation obfuscation (MO) mechanisms. In such mechanisms, the transmitter attempts to hide the modulation order of a frame's payload from eavesdroppers, which could otherwise exploit such information to breach user privacy or launch selective attacks. We go further and complement our CFO-aware demodulation scheme by optimizing the design of a low-complexity MO technique with respect to phase errors. Our results show that when combined, our CFO-aware demodulation and optimized MO techniques achieve up to 5 dB gain over conventional demodulation schemes that are not obfuscated and are oblivious to residual CFO.

Original languageEnglish (US)
Title of host publicationINFOCOM 2018 - IEEE Conference on Computer Communications
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1592-1600
Number of pages9
Volume2018-April
ISBN (Electronic)9781538641286
DOIs
StatePublished - Oct 8 2018
Event2018 IEEE Conference on Computer Communications, INFOCOM 2018 - Honolulu, United States
Duration: Apr 15 2018Apr 19 2018

Other

Other2018 IEEE Conference on Computer Communications, INFOCOM 2018
CountryUnited States
CityHonolulu
Period4/15/184/19/18

Fingerprint

Demodulation
Error analysis
Modulation
Transmitters
Doppler effect
Quadrature amplitude modulation
Communication satellites
Wireless local area networks (WLAN)
Probability distributions

Keywords

  • Demodulation
  • Frequency offset
  • Modulation obfuscation
  • PHY-layer security
  • WLAN

ASJC Scopus subject areas

  • Computer Science(all)
  • Electrical and Electronic Engineering

Cite this

Rahbari, H., Siyari, P., Krunz, M. M., & Jerry Park, J. M. (2018). Adaptive Demodulation for Wireless Systems in the Presence of Frequency-Offset Estimation Errors. In INFOCOM 2018 - IEEE Conference on Computer Communications (Vol. 2018-April, pp. 1592-1600). [8485922] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/INFOCOM.2018.8485922

Adaptive Demodulation for Wireless Systems in the Presence of Frequency-Offset Estimation Errors. / Rahbari, Hanif; Siyari, Peyman; Krunz, Marwan M; Jerry Park, Jung Min.

INFOCOM 2018 - IEEE Conference on Computer Communications. Vol. 2018-April Institute of Electrical and Electronics Engineers Inc., 2018. p. 1592-1600 8485922.

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

Rahbari, H, Siyari, P, Krunz, MM & Jerry Park, JM 2018, Adaptive Demodulation for Wireless Systems in the Presence of Frequency-Offset Estimation Errors. in INFOCOM 2018 - IEEE Conference on Computer Communications. vol. 2018-April, 8485922, Institute of Electrical and Electronics Engineers Inc., pp. 1592-1600, 2018 IEEE Conference on Computer Communications, INFOCOM 2018, Honolulu, United States, 4/15/18. https://doi.org/10.1109/INFOCOM.2018.8485922
Rahbari H, Siyari P, Krunz MM, Jerry Park JM. Adaptive Demodulation for Wireless Systems in the Presence of Frequency-Offset Estimation Errors. In INFOCOM 2018 - IEEE Conference on Computer Communications. Vol. 2018-April. Institute of Electrical and Electronics Engineers Inc. 2018. p. 1592-1600. 8485922 https://doi.org/10.1109/INFOCOM.2018.8485922
Rahbari, Hanif ; Siyari, Peyman ; Krunz, Marwan M ; Jerry Park, Jung Min. / Adaptive Demodulation for Wireless Systems in the Presence of Frequency-Offset Estimation Errors. INFOCOM 2018 - IEEE Conference on Computer Communications. Vol. 2018-April Institute of Electrical and Electronics Engineers Inc., 2018. pp. 1592-1600
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