Performance Analysis of Neural Network Detectors by Importance Sampling Techniques

  • Authors:
  • José L. Sanz-González;Diego Andina

  • Affiliations:
  • Universidad Politécnica de Madrid (Dpto. SSR), ETSI de Telecommunicación-UPM, Ciudad Universitaria, 28040 Madrid, Spain, e-mail: jlsanz@gc.ssr.upm.es;Universidad Politécnica de Madrid (Dpto. SSR), ETSI de Telecommunicación-UPM, Ciudad Universitaria, 28040 Madrid, Spain, e-mail: jlsanz@gc.ssr.upm.es

  • Venue:
  • Neural Processing Letters
  • Year:
  • 1999

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Abstract

Often, Neural Networks are involved in binary detectors of communication, radar or sonar systems. The design phase of a neural network detector usually requires the application of Monte Carlo trials in order to estimate some performance parameters. The classical Monte Carlo method is suitable to estimate high event probabilities (higher than 0.01), but not suitable to estimate very low event probabilities (say, 10^-5 or less). For estimations of very low false alarm probabilities (or error probabilities), a modified Monte Carlo technique, the so-called Importance Sampling (IS) technique, is considered in this paper; some topics are developed, such as optimal and suboptimal IS probability density functions (biasing density functions), control parameters and new algorithms for the minimization of the estimator error. The main novelty of this paper is the application of an efficient IS technique on neural networks, drastically reducing the number of patterns required for testing events of low probability. As a practical application, the IS technique is applied to a neural detector on a radar (or sonar) system.