High-fidelity modulation parameter estimation of non-cooperative transmitters: Baud-period and timing

  • Authors:

  • Mauricio de Oliveira;Robert R. Bitmead

  • Affiliations:

  • Department of Mechanical & Aerospace Engineering, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0411, USA;Department of Mechanical & Aerospace Engineering, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0411, USA

  • Venue:
  • Digital Signal Processing
  • Year:
  • 2011

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Abstract

An approach is developed for the estimation of baud-period and signal timing for a non-cooperative transmitter. The high-fidelity estimation of modulation parameters of non-cooperative transmitters is of interest in classifying transmitters without the need for signal content analysis nor for negotiation. Rather, the aim is to explore the characterization of transmitters based on detailed features, due to hardware or software, of their modulation. The techniques applied here form part of a unified iterative scheme, wherein coarse estimates of parameters are used to refine estimates of other modulation parameters. Our focus is on the generation of initial estimates of baud-period and of subsequent timing recovery, followed by the analysis of refining approaches. The emphasis is on the absence of prior knowledge about the signal modulation scheme or of the signal content and on establishing initial reliable estimates. Accordingly, the approach is statistical and based on the observed behavior of signals derived in a non-linear fashion from the sampled data.