Phase Noise in Full-Duplex Radios Using Off-the-Shelf Oscillators

Chunqing Zhang*, Leo Laughlin, Mark A. Beach, Kevin A. Morris, John L. Haine

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

3 Citations (Scopus)
306 Downloads (Pure)


This letter analyzes the effect of phase noise (PN) on digital non-linear self-interference (SI) cancellation for low delay spread non-linear SI channels typical of small form factor in-band full-duplex (IBFD) radios in indoor environments. Use of a shared local oscillator (LO) between the transmit and receive radios is assumed, and it is shown that, in theory, un-cancelled SI due to PN can be reduced by optimizing the relative delay between receive LO path and SI channel. Simulations and measurements from hardware IBFD transceivers using realistic LO phase noise characteristics demonstrate that, for these devices/environments, in practice LO phase noise does not limit digital cancellation when using shared local oscillators.

Original languageEnglish
Pages (from-to)206-209
Number of pages4
JournalIEEE Wireless Communications Letters
Issue number2
Early online date20 Oct 2017
Publication statusPublished - 1 Apr 2018


  • In-band full-duplex
  • non-linearity
  • phase noise
  • shared local oscillator


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