Tracking ability of L-level MLP-based equalizers in nonlinear microwave radio channels in the presence of multipath fading

Eric K. Luk; Anthony D. Fagan

doi:10.1117/12.169954

2 March 1994 Tracking ability of L-level MLP-based equalizers in nonlinear microwave radio channels in the presence of multipath fading

Eric K. Luk, Anthony D. Fagan

Author Affiliations +

Proceedings Volume 2243, Applications of Artificial Neural Networks V; (1994) https://doi.org/10.1117/12.169954
Event: SPIE's International Symposium on Optical Engineering and Photonics in Aerospace Sensing, 1994, Orlando, FL, United States

Abstract

The performance of microwave digital radio systems is severely degraded by multipath fading and also by the nonlinear power amplifier at the transmitter, the combined effects of these result in a time varying nonlinear channel. In this paper, the multilayer perceptron (MLP) based equalizer is investigated for use on such channels. It is found to outperform the conventional approach, that is, the use of a transversal equalizer at the receiver operating with a signal predistorter placed before the non-linear power amplifier at the transmitter. An L- level non-linear function is used as a node activation for the MLP. Two update schemes are investigated, one being a complex version of the back propagation algorithm, the other a complex version of the delta-bar-delta algorithm.

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Eric K. Luk and Anthony D. Fagan "Tracking ability of L-level MLP-based equalizers in nonlinear microwave radio channels in the presence of multipath fading", Proc. SPIE 2243, Applications of Artificial Neural Networks V, (2 March 1994); https://doi.org/10.1117/12.169954

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