Separation of close sinusoids by cross-coupled phase locked loop

D. Wulich, E. I. Plotkin, M. N.S. Swamy, E. Kashi

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations


A study is made of a cross-coupled phase-locked loop (CCPLL) used for separation of close sinusoids with slowly varying frequencies. It is assumed that the sinusoids have equal amplitudes, and it is shown that the CCPLL system can effectively separate two sine signals with an observation interval T < 1/Δ f. An analysis in the presence of noise is also given. It is shown that a satisfactory phase estimation can be achieved for SNR ≥ 15 dB. The result has application in fields such as ranging, symbol synchronization, and carrier recovery for coherent demodulation.

Original languageEnglish
Pages (from-to)2128-2131
Number of pages4
JournalProceedings - ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing
StatePublished - 1 Dec 1989
Externally publishedYes
Event1989 International Conference on Acoustics, Speech, and Signal Processing - Glasgow, Scotland
Duration: 23 May 198926 May 1989

ASJC Scopus subject areas

  • Software
  • Signal Processing
  • Electrical and Electronic Engineering


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