Performance evaluation of multilayer perceptrons in signal detection and classification.

Published

Journal Article

Multilayer perceptrons trained with the backpropagation algorithm are tested in detection and classification tasks and are compared to optimal algorithms resulting from likelihood ratio tests. The focus is on the problem of one of M orthogonal signals in a Gaussian noise environment, since both the Bayesian detector and classifier are known for this problem and can provide a measure for the performance evaluation of the neural networks. Two basic situations are considered: detection and classification. For the detection part, it was observed that for the signal-known-exactly case (M=1), the performance of the neural detector converges to the performance of the ideal Bayesian decision processor, while for a higher degree of uncertainty (i.e. for a larger M), the performance of the multilayer perceptron is inferior to that of the optimal detector. For the classification case, the probability of error of the neural network is comparable to the minimum Bayesian error, which can be numerically calculated. Adding noise during the training stage of the network does not affect the performance of the neural detector; however, there is an indication that the presence of noise in the learning process of the neural classifier results in a degraded classification performance.

Full Text

Duke Authors

Cited Authors

  • Michalopoulou, ZH; Nolte, LW; Alexandrou, D

Published Date

  • January 1995

Published In

Volume / Issue

  • 6 / 2

Start / End Page

  • 381 - 386

PubMed ID

  • 18263320

Pubmed Central ID

  • 18263320

Electronic International Standard Serial Number (EISSN)

  • 1941-0093

International Standard Serial Number (ISSN)

  • 1045-9227

Digital Object Identifier (DOI)

  • 10.1109/72.363473

Language

  • eng