Artificial neural network based estimation of sparse multipath channels in OFDM systems

Habib Senol (), Abdur Rehman Bin Tahir () and Atilla Özmen ()
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Habib Senol: Kadir Has University
Abdur Rehman Bin Tahir: Kadir Has University
Atilla Özmen: Kadir Has University

Telecommunication Systems: Modelling, Analysis, Design and Management, 2021, vol. 77, issue 1, No 13, 240 pages

Abstract: Abstract In order to increase the transceiver performance in frequency selective fading channel environment, orthogonal frequency division multiplexing (OFDM) system is used to combat inter-symbol-interference. In this work, a channel estimation scheme for an OFDM system in the presence of sparse multipath channel is studied using the artificial neural networks (ANN). By means of ANN’s learning capability, it is shown that how to model and obtain a channel estimate and how it allows the proposed technique to give a better system throughput. The performance of proposed method is compared with the Matching Pursuit (MP) and Orthogonal MP (OMP) algorithms that are commonly used in compressed sensing literature in order to estimate delay locations and tap coefficients of a sparse multipath channel. In this work, we propose a performance- efficient ANN based sparse channel estimator with lower computational cost than that of MP and OMP based channel estimators. Even though there is a slight performance lost in a few simulation scenarios in which we have lower computational complexity advantage, in most scenarios, our computer simulations corroborate that our low complexity ANN based channel estimator has better mean squared error and the corresponding symbol error rate performances comparing with MP and OMP algorithms.

Keywords: Artificial neural networks; Sparse channel; Channel estimation; Compressed sensing; Matching pursuit; OFDM (search for similar items in EconPapers)
Date: 2021
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DOI: 10.1007/s11235-021-00754-5

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