The OFDM system based on Discrete Cosine Harmonic Wavelet transform

Suma, M. N.; Narasimhan, S. V.; Kanmani, B

doi:10.1109/ncc.2012.6176766

Cited by 6 publications

(10 citation statements)

References 14 publications

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“…In contrast to the OFDM system, the FBMC waveform has been demonstrated to be less sensitive to timing error between the different cells, due to the better frequency localization of the prototype filter. A new OFDM system based on a discrete cosine harmonic wavelet transform (DCHWT) for binary phase shift keying (BPSK) and QPSK signals was proposed in [13]. The proposed DCHWT-OFDM system provided superior performance in terms of BER and peak-to-average power ratio (PAPR) compared with the discrete cosine transform (DCT)-OFDM, discrete Fourier transform (DFT)-OFDM, and Haar WT-OFDM systems.…”

Section: Related Workmentioning

confidence: 99%

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

2019

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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.

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Section: Related Workmentioning

confidence: 99%

“…The Viterbi algorithm operates by computing a metric for every possible path in the trellis [13]. The path with the lower metric is retained and the other path is discarded.…”

Section: Convolutional Encoder and Viterbi Decodermentioning

confidence: 99%

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

2019

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“…In view of these advantages, DCHWT has been successfully employed for spectral estimation, compression [11,12]. Due to reduced leakage and computational simplicity of DCHWT, it is of interest to explore its application for OFDM system [14].…”

Section: Discrete Cosine Harmonic Wavelet Transform (Dchwt)mentioning

confidence: 99%

“…Also, this method does not require explicit decimation, interpolation and filtering, hence computationally simple. Our preliminary study on DCHWT OFDM [14] considered only BPSK and QPSK signals as its inputs. The present work extends the DCHWT OFDM to bandwidth efficient quadrature amplitude modulation (QAM) signals.…”

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confidence: 99%

“…. H N −1 are N channel coefficients considered and E av is the average DCHWT OFDM-QAM symbol power, N 0 is Noise Power.4.1 DCHWT OFDM for BPSK ModulationFigure 1shows baseband implementation of DCHWT-OFDM for BPSK modulation[14]. The inverse DCHWT (IDCHWT) which transforms data into time domain is applied at the transmitter end and forward DCHWT at the receiver.…”

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A New OFDM System Based on Discrete Cosine Harmonic Wavelet Transform (DCHWT) for PSK and QAM

Suma¹,

Narasimhan

Kanmani³

2014

Wireless Pers Commun

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This paper proposes a new orthogonal frequency division multiplexing (OFDM) system, based on discrete cosine harmonic wavelet (DCHWT) for PSK and 16-QAM modulated signals. This system uses energy compaction property of discrete cosine transform (DCT) that provides low leakage in subcarriers. DCHWT based OFDM system provides improved performance in terms of bit error rate (BER) and reduction in the peak to average power ratio (PAPR) compared to conventional cyclic prefix (CP) based Fourier transform OFDM (DFT-OFDM). Application of μ-law companding to proposed system further improves the PAPR performance. The complementary cumulative distribution (CCDF) plots corroborate the same. BER performance is on par or better than that of Haar wavelet based OFDM in addition to improvement in PAPR. PAPR improved is in the range of 0.8-2.3 dB compared to Haar and DFT OFDM respectively, with remarkable improvement in BER. Proposed method is simple, does not require explicit decimation, interpolation, associated filtering and delay compensation for reconstruction, compared to other time domain wavelet transforms.

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Analytic discrete cosine harmonic wavelet transform based OFDM system

Suma¹,

Narasimhan

Kanmani³

2015

Sadhana

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An OFDM based on Analytic Discrete Cosine Harmonic Wavelet Transform (ADCHWT_OFDM) has been proposed in this paper. Analytic DCHWT has been realized by applying DCHWT to the original signal and to its Hilbert transform. ADCHWT has been found to be computationally efficient and very effective in improving Bit Error Rate (BER) and Peak to Average Power Ratio (PAPR) performance. Improvement compared to that of Haar-WT OFDM and DFT OFDM is achieved without employing Cyclic Prefix BER is 0.002 for ADCHWT OFDM compared to Haar WT, DFT OFDM which have BER of 0.06 and 0.4, respectively, at 15 dB SNR. PAPR is also reduced by 3 dB compared to DFT OFDM and 0.3 dB reduction compared to Haar WT OFDM.

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The OFDM system based on Discrete Cosine Harmonic Wavelet transform

Cited by 6 publications

References 14 publications

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

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

A New OFDM System Based on Discrete Cosine Harmonic Wavelet Transform (DCHWT) for PSK and QAM

Analytic discrete cosine harmonic wavelet transform based OFDM system

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