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Open AccessArticle

Channel Estimation Based on IOTA Filter in OFDM/OQPSK and OFDM/OQAM Systems

School of Mechanical, Electrical and Information Engineering, Shandong University, Weihai 264209, China
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Appl. Sci. 2019, 9(7), 1454; https://doi.org/10.3390/app9071454
Received: 31 December 2018 / Revised: 26 March 2019 / Accepted: 1 April 2019 / Published: 7 April 2019
(This article belongs to the Special Issue Underwater Acoustic Communications and Networks)
In this paper, we present a study of bit error rate (BER) for orthogonal frequency division multiplexing/offset quadrature phase shift keying (OFDM/OQPSK) and OFDM/offset quadrature amplitude modulation (OQAM) systems with an isotropic orthogonal transfer algorithm (IOTA) filter. The novel noise suppression method based on an IOTA filter is proposed to reduce the error of channel estimation caused by additive white Gaussian noise (AWGN). The OFDM/OQPSK and OFDM/OQAM systems do not insert the guard interval (GI) and pilots in the signal frames, thus they possess transmission efficiency. An analysis was carried out for convolutional coded OFDM/OQPSK and OFDM/OQAM systems in Rayleigh fading channels with generator polynomials and constraint lengths. Compared with conventional OFDM/QPSK and OFDM/QAM systems with the insertion of comb-type pilots, the proposed IOTA filter-based channel estimation method can provide significant energy per bit to time-varying noise power spectral density ratio gains over time and frequency-selective propagation Rayleigh fading channels in OFDM/OQPSK and OFDM/OQAM systems. View Full-Text
Keywords: channel estimation; orthogonal frequency division multiplexing (OFDM); isotropic orthogonal transform algorithm (IOTA); offset quadrature phase shift keying (OQPSK); offset quadrature amplitude modulation (OQAM); additive white Gaussian noise (AWGN) channel estimation; orthogonal frequency division multiplexing (OFDM); isotropic orthogonal transform algorithm (IOTA); offset quadrature phase shift keying (OQPSK); offset quadrature amplitude modulation (OQAM); additive white Gaussian noise (AWGN)
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Zhou, X.; Wang, C.; Tang, R. Channel Estimation Based on IOTA Filter in OFDM/OQPSK and OFDM/OQAM Systems. Appl. Sci. 2019, 9, 1454.

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