Abstract
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.
Highlights
Wavelets have been a very hot research area in recent years
This paper proposes a channel estimation method based on an isotropic orthogonal transfer algorithm (IOTA) filter, which is applied in orthogonal frequency division multiplexing (OFDM)/offset quadrature phase shift keying (OQPSK) and OFDM/offset quadrature amplitude modulation (OQAM) systems
A new OFDM system based on a discrete cosine harmonic wavelet transform peak-to-average power ratio (PAPR) compared with the discrete cosine transform (DCT)-OFDM, (DCHWT) for binary phase shift keying (BPSK) and QPSK signals was proposed in [13]
Summary
Wavelets have been a very hot research area in recent years. Their application ranges from function approximation, signal multiresolution representation, and image compression to signal processing and other fields. The. ISI and ICI in OFDM/QPSK systems can be suppressed utilizing polyphase filter banks with good TFL property. Compared with OFDM systems, the TFL property of the IOTA filter can guarantee good bit error rate (BER) performance that combats ISI and ICI in OFDM/OQPSK and OFDM/OQAM systems. This paper proposes a channel estimation method based on an IOTA filter, which is applied in OFDM/OQPSK and OFDM/OQAM systems. It has high spectral and data transmission efficiency which effectively suppresses the additive white Gaussian noise (AWGN) existing at the estimated channel coefficients in the time domain.
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