Analysis of peak-to-average power ratio of a multicarrier system based on the fractional Fourier transform

2004 ◽  
Author(s):  
Y. Ju ◽  
B. Barkat ◽  
S. Attallah
Keyword(s):  
Fourier Transform ◽  
Fractional Fourier Transform ◽  
Average Power ◽  
Power Ratio ◽  
Multicarrier System

scholarly journals The impact of financial repression on manufacturing upgrade based on fractional Fourier transform and probability

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Na Zhao ◽  
Fengge Yao ◽  
Alaa Omar Khadidos ◽  
Bishr Muhamed Muwafak
Keyword(s):  
Fourier Transform ◽  
Fractional Fourier Transform ◽  
Average Power ◽  
Power Ratio ◽  
Informal Finance ◽  
Financial Repression ◽  
Manufacturing Enterprises ◽  
Financing Channels ◽  
The Cost ◽  
The Impact

Abstract This paper proposes a method combining fractional Fourier transform (FRFT) and a high peak-to-average power ratio suppression algorithm. Calculations show that as the order of the FRFT decreases, the peak-to-average power ratio of the signal gradually decreases; combined with the suppression algorithm can further reduce the peak-to-average power ratio of the system and solve the problem of the suppression algorithm affecting system performance. At the same time, this paper uses the 2012 World Bank survey data of Chinese manufacturing enterprises to study the influence of financial repression on the selection of financing channels of manufacturing enterprises. The research results show that financial repression has a significant impact on the choice of financing channels for manufacturing enterprises, which greatly increases the proportion of informal financial financing in the operating capital of enterprises and reduces the proportion of formal financial financing. Financial repression has led to an increase in the cost of formal financial financing, making enterprises choose informal financial channels for financing. Among them, large enterprises tend to choose commercial credit in informal finance, while small and medium-sized enterprises choose private credit It is possible to choose two financing channels, which reflects the ‘scale discrimination’ characteristics of financial repression.

scholarly journals A Modified SLM Scheme for PAPR Reduction of UFMC Systems

2021 ◽  
Vol 2128 (1) ◽  
pp. 012004
Author(s):  
Sahar M. Alrabeiy ◽  
Sameh A. Fathy ◽  
Safa M. Gasser ◽  
Mohamed S. El-Mahallawy
Keyword(s):  
Spectral Efficiency ◽  
Average Power ◽  
Low Complexity ◽  
Papr Reduction ◽  
Low Latency ◽  
Power Ratio ◽  
Multicarrier Transmission ◽  
Multicarrier System ◽  
Transmission Technique ◽  
Conventional Scheme

Abstract One of the most promising 5G waveform candidates is the universal-filtered multicarrier system (UFMC). The UFMC system reduces the out-of-band (OoB) emission, bringing about higher spectral efficiency. This is assumed to reach robustness against frequency offset and low latency. Although, as aforementioned, the UFMC system offers many advantages, it lacks high peak-to-average power ratio (PAPR) as a multicarrier transmission technique. This research paper tackles two approaches; firstly, RCS, by developing a simulated conventional SLM system, with modifications to generate the same number of waveforms, while using fewer UFMC modulators. Secondly, by developing a simulated conventional SLM system, with modifications using the same number of modulators to generate more waveforms that would be generated in the conventional scheme. The two sets of results from the proposed M-SLM scheme are compared to each other, and to other PAPR reduction schemes using OFDM and UFMC. To reduce PAPR in UFMC systems, (M-SLM) scheme with low complexity is proposed. The essence of the proposed M-SLM scheme is represented in making use of the cyclically shifting process and FMC modulator’s linearity property. The proposed M-SLM scheme uses Um UFMC modulators to produce Uw alternative UFMC waveforms, where Uw = Um (2Um − 1). As a result, drawing a comparison with existing SLM based PAPR reduction schemes for UFMC systems; the proposed M-SLM scheme's computational complexity is reduced. Finally, there is a comparison between the proposed M-SLM scheme and the schemes there in the literature according to PAPR reduction ability.

scholarly journals Three Term Weighted Type Fractional Fourier Transform Based Generalized Hybrid Carrier and Its Application into PAPR Suppression

2021 ◽  
Author(s):  
Yong Li ◽  
Zhiqun Song ◽  
Teng Sun ◽  
Bin Wang
Keyword(s):  
Fourier Transform ◽  
Orthogonal Frequency Division Multiplexing ◽  
Fractional Fourier Transform ◽  
Average Power ◽  
The Novel ◽  
Cumulative Density Function ◽  
Ofdm System ◽  
Single Carrier ◽  
Definition Of ◽  
Weighted Type

To suppress the peak to average power ratio (PAPR) of wireless communication based upon multi-carrier system. We, in this paper, proposed the three term weighted type fractional Fourier transform (3-WFRFT) based generalized hybrid carrier (GHC) system. We first provide the definition of 3-WFRFT. Moreover, some useful properties of 3-WFRFT have been presented, in this paper, which will helpful to comprehend the novel 3-WFRFT transform. Furthermore, we take PAPR of the proposed algorithm, in comparison with orthogonal frequency division multiplexing (OFDM) system and single carrier modulation (SC) system under typical complementary cumulative density function (CCDF) level. It would be demonstrated that, from some numerical simulations, the proposed 3-WFRFT based GHC performs better than OFDM system and will be useful to reduce the PAPR level.

scholarly journals Generalized Discrete Fourier Transform for FBMC Peak to Average Power Ratio Reduction

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 81730-81740 ◽  
Author(s):  
Mohamed A. Aboul-Dahab ◽  
Mohamed M. Fouad ◽  
Radwa A. Roshdy
Keyword(s):  
Fourier Transform ◽  
Discrete Fourier Transform ◽  
Average Power ◽  
Power Ratio ◽  
Power Ratio Reduction ◽  
Ratio Reduction

scholarly journals Peak to Average Power Ratio Reduction in NC–OFDM Systems

2015 ◽  
Vol 66 (3) ◽  
pp. 154-158 ◽  
Author(s):  
Saadia Tabassum ◽  
Sajjad Hussain ◽  
Abdul Ghafoor
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
Fractional Fourier Transform ◽  
Average Power ◽  
Modulation Scheme ◽  
Power Ratio ◽  
Ofdm Systems ◽  
Radio Communications ◽  
Trigonometric Transforms ◽  
Power Ratio Reduction ◽  
Ratio Reduction

Abstract Non contiguous orthogonal frequency division multiplexing (NC-OFDM) is an efficient and adaptable multicarrier modulation scheme to be used in cognitive radio communications. However like OFDM, NC-OFDM also suffers from the main drawback of high peak to average power ratio (PAPR). In this paper PAPR has been reduced by employing three different trigonometric transforms. Discrete cosine transform (DCT), discrete sine transform (DST) and fractional fourier transform (FRFT) has been combined with conventional selected level mapping (SLM) technique to reduce the PAPR of both OFDM and NC-OFDM based systems. The method combines all the transforms with SLM in different ways. Transforms DCT, DST and FRFT have been applied before the SLM block or inside the SLM block before IFFT. Simulation results show the comparative analysis of all the transforms using SLM in case of both OFDM and NC-OFDM based systems.

Simulation on PAPR Suppression Algorithm for Multicarrier System

2014 ◽  
Vol 596 ◽  
pp. 794-798
Author(s):  
Rui Zhang ◽  
Zhi Bin Zeng
Keyword(s):  
Power Amplifier ◽  
Power Efficiency ◽  
Average Power ◽  
Power Ratio ◽  
Error Vector Magnitude ◽  
Crest Factor ◽  
Multicarrier System ◽  
Crest Factor Reduction ◽  
Small Distortion ◽  
Vector Magnitude

The main disadvantage of multicarrier system is the high peak-to-average power ratio which can easily result in significant cut-the-top distortion of power amplifier. However, the power efficiency of power amplifier will be reduced by power back-off technology. Therefore, crest factor reduction is important in reducing the peak-to-average power ratio of multicarrier system and improving the efficiency of power amplifier. The peak-to-average power ratio can be effectively reduced with small distortion by the algorithm of crest factor reduction based on peak cancellation. And the performance of peak-to-average power ratio is better with the same error vector magnitude.

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