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Erschienen in: Neural Computing and Applications 3-4/2013

01.03.2013 | Extreme Learning Machine’s Theory & Application

QAM equalization and symbol detection in OFDM systems using extreme learning machine

verfasst von: Ishaq Gul Muhammad, Kemal E. Tepe, Esam Abdel-Raheem

Erschienen in: Neural Computing and Applications | Ausgabe 3-4/2013

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Abstract

This paper presents a new learning-based framework to jointly solve equalization and symbol detection problems in orthogonal frequency division multiplexing systems with quadrature amplitude modulation. The framework utilizes extreme learning machine (ELM), a recent addition to the class of supervised learning algorithms, to achieve fast training, high performance, and low error rates. The proposed ELM scheme employs infinitely differentiable nonlinear activation functions in least-square solution to learn the channel response, which is the equalization part. In addition to equalization, ELM performs symbol detection. Existing learning-based schemes require an additional symbol slicer for the symbol detection. The proposed framework does not experience training bottleneck imposed by gradient descent–based approaches. Simulation results show that the proposed framework outperforms other learning-based equalizers in terms of symbol error rate and training speeds.

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Metadaten
Titel
QAM equalization and symbol detection in OFDM systems using extreme learning machine
verfasst von
Ishaq Gul Muhammad
Kemal E. Tepe
Esam Abdel-Raheem
Publikationsdatum
01.03.2013
Verlag
Springer-Verlag
Erschienen in
Neural Computing and Applications / Ausgabe 3-4/2013
Print ISSN: 0941-0643
Elektronische ISSN: 1433-3058
DOI
https://doi.org/10.1007/s00521-011-0796-y

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