An effective key generation system using improved channel reciprocity

Junqing Zhang, Roger Woods, Alan Marshall, Trung Q. Duong

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

15 Citations (Scopus)


In physical layer security systems there is a clear need to exploit the radio link characteristics to automatically generate an encryption key between two end points. The success of the key generation depends on the channel reciprocity, which is impacted by the non-simultaneous measurements and the white nature of the noise. In this paper, an OFDM subcarriers' channel responses based key generation system with enhanced channel reciprocity is proposed. By theoretically modelling the OFDM subcarriers' channel responses, the channel reciprocity is modelled and analyzed. A low pass filter is accordingly designed to improve the channel reciprocity by suppressing the noise. This feature is essential in low SNR environments in order to reduce the risk of the failure of the information reconciliation phase during key generation. The simulation results show that the low pass filter improves the channel reciprocity, decreases the key disagreement, and effectively increases the success of the key generation.

Original languageEnglish
Title of host publication2015 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages5
ISBN (Electronic)9781467369978
Publication statusPublished - 04 Aug 2015
EventIEEE International Conference on Acoustics, Speech, and Signal Processing 2015 - South Brisbane, Australia
Duration: 19 Apr 201524 Apr 2015


ConferenceIEEE International Conference on Acoustics, Speech, and Signal Processing 2015
Abbreviated titleICASSP 2015
CitySouth Brisbane
Internet address


  • channel reciprocity
  • key disagreement
  • key generation
  • low pass filter
  • Physical layer security

ASJC Scopus subject areas

  • Signal Processing
  • Software
  • Electrical and Electronic Engineering


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