Stochastic modeling of the PPG signal: a synthesis-by-analysis approach with applications

Diego Martín-Martínez, Pablo Casaseca-de-la-Higuera, Marcos Martín-Fernández, Carlos Alberola-López

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

In this paper, we propose a stochastic model of photoplethysmographic signals that is able to synthesize an arbitrary number of other statistically equivalent signals to the one under analysis. To that end, we first preprocess the pulse signal to normalize and time-align pulses. In a second stage, we design a single-pulse model, which consists of ten parameters. In the third stage, the time evolution of this ten-parameter vector is approximated by means of two autoregressive moving average models, one for the trend and one for the residue; this model is applied after a decorrelation step which let us to process each vector component in parallel. The experiments carried out show that the model we here propose is able to maintain the main features of the original signal; this is accomplished by means of both a linear spectral analysis and also by comparing two measures obtained from a nonlinear analysis. Finally, we explore the capability of the model to: 1) track physical activity; 2) obtain statistics of clinical parameters by model sampling; and 3) recover corrupted or missing signal epochs by synthesis.
Original languageEnglish
Pages (from-to)2432-2441
Number of pages10
JournalIEEE Transactions on Biomedical Engineering
Volume60
Issue number9
DOIs
Publication statusPublished - 12 Apr 2013
Externally publishedYes

Keywords

  • ARMA
  • benchmarking
  • modeling
  • PCA
  • photoplethysmography
  • signal synthesis
  • statistical validation
  • subject simulation

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