PAPR reduction of wavelet-OFDM systems using pilot symbols

Anoh, Kelvin; Ikpehai, Augustine; Rabie, Khaled M.; Adebisi, Bamidele; Popoola, Wasiu O.

doi:10.1109/isplc.2018.8360242

Cited by 11 publications

(10 citation statements)

References 25 publications

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“…Further, the orthogonal expression corresponding to the formula (7) is: In general, the MQAM signal constellation is in a rectangular form. For a rectangular signal constellation diagram under 2 k M  ( k is an even number), the MQAM signal constellation is equivalent to two PAM (Pulse Amplitude Modulation) signals on the orthogonal carrier signal [28], [29], [30]. Each of these two signals has 2 2 k M  signal points [31], [32], [33].…”

Section: A Two-dimensional New Communication Technology Working Mechmentioning

confidence: 99%

Two-Dimensional New Communication Technology for Networked Ammunition

et al. 2020

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In order to improve the transmission data rate and the three-resistance characteristics of the network ammunition communication link, this paper proposes a new communication technology with two dimensions. In this technology, orthogonal frequency division multiplexing (OFDM) is used for onedimensional data transmission, and the G-function-driven subcarrier frequency change rule in differential frequency hopping (DFH) is used for two-dimensional data transmission, which breaks through the conventional idea of using carrier amplitude frequency phase modulation information, and establishes a new two-dimensional communication model based on DFH-OFDM. The theoretical analysis and simulation results show that the proposed two-dimensional new communication technology, without changing the original communication system and signal characteristics, effectively reduces the probability of signal interception, improves the communication system capacity, and has good three-resistance performance.

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Section: A Two-dimensional New Communication Technology Working Mechmentioning

confidence: 99%

Two-Dimensional New Communication Technology for Networked Ammunition

et al. 2020

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“…where ρ is the attenuation factor that determines the output signal amplitude and d(n) is the distortion noise after F (x(n)) operation. Substituting (16) into (13), gives…”

Section: B Proposed Nonlinear Companding Transformmentioning

confidence: 99%

“…Furthermore, clipping [9]- [11] and companding [12] techniques are applied after OFDM modulation. Other OFDM design kernels such as wavelets [13] possess low PAPR than conventional OFDM scheme. While clipping expands the system processing time due to (2m + 1) fast Fourier transform (FFT)/inverse FFT (IFFT) operations (m is the number of clipping/filtering iterations), companding increases the receiver complexity due to decompanding of companded signals.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Nonlinear Companding Scheme for Reducing PAPR of OFDM Systems

Adebisi

Anoh

Rabie

2019

IEEE Systems Journal

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A new companding scheme for reducing the peakto-average power ratio (PAPR) of orthogonal frequency-division multiplexing (OFDM) systems is proposed in this study. It proceeds from speech signal processing similar to the earliest µlaw companding (MC) model. The proposed scheme compands (compresses and expands) the amplitudes of OFDM signals to a maximum of 1 − volt. Besides significantly reducing the PAPR, the proposed technique is also able to function as a limiter thus reducing the system complexity and limiting the amplitudes of OFDM symbols to a unity maximum voltage which does not exist in other companding PAPR techniques. Over frequencyselective fading channels with frequency domain equalization and using minimum mean square error (MMSE) to minimize the noise overhead, the proposed technique outperforms four other companding schemes over light and severe fading conditions. Lastly, we demonstrate that PAPR reduction using companding can dispense with correspondingly applying decompanding at the receiver as it amplifies the distortion noise thereby reducing the bit error ratio performance and increases the receiver complexity. We investigated the out-of-band interference of the proposed scheme and also show that it outperforms the other existing techniques by up to 5dB. Index Terms-Nonlinear companding, orthogonal frequency division multiplexing (OFDM), peak-to-average power ratio (PAPR), limiter, power amplifier (PA), out-of-band interference (OBI).

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“…The alternative kernel uses the DFT tool except that there exists dilation (stretching) and translation (repositioning) of the signal coefficients. Since WT finds applications in communication systems design, WT-OFDM has been studied by different authors for wireless [13]- [16] and PLC [17], [18] systems. A major drawback in its adoption is that it is computationally inefficient and recent studies have led to different computationally efficient algorithms such as the ones reported in [9] and [19].…”

Section: A Ofdm Systems Design Using Wtmentioning

confidence: 99%

OFDM Systems Design Using Harmonic Wavelets

Anoh

Ikpehai

Adebisi

et al. 2019

2019 IEEE Wireless Communications and Networking Conference (WCNC)

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Orthogonal frequency-division multiplexing (OFDM) is a popular multi-carrier technique used in many digital communication systems such as wireless fidelity (Wi-Fi), long term evolution (LTE) and power line communication systems. It can be designed using fast Fourier transform (FFT) or wavelet transform (WT). The major drawback in using WT is that it is computationally inefficient. In this study, we introduce a simple and computationally efficient WT, harmonic wavelet transform, for OFDM signal processing. The new WT uses the orthogonal basis functions of conventional FFT-OFDM except that it involves translation and dilation of the input signal; the new wavelets is referred to as harmonic wavelets (HW). When compared with pilot-assisted OFDM system in terms of reduction in the peak-to-average power ratio, the results show that HW-OFDM outperforms FFT-OFDM by 3 dB at 10 −4 CCDF (complementary cumulative distribution function). Over Rayleigh fading channel with additive white Gaussian noise (AWGN), the bit error ratio of both FFT-OFDM and HW-OFDM perfectly matched, showing that the proposed HW-OFDM is better in terms of peak-to-average power ratio reduction.

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PAPR reduction of wavelet-OFDM systems using pilot symbols

Cited by 11 publications

References 25 publications

Two-Dimensional New Communication Technology for Networked Ammunition

Two-Dimensional New Communication Technology for Networked Ammunition

Enhanced Nonlinear Companding Scheme for Reducing PAPR of OFDM Systems

OFDM Systems Design Using Harmonic Wavelets

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