Low-complexity peak-to-average ratio (PAPR) inhibition method of FRFT-OFDM (fractional Fourier transform-orthogonal frequency division multiplexing) system

A FRFT-OFDM, 1. FRFT-OFDM technology, applied in the field of low-complexity peak-to-average ratio suppression, can solve problems such as reducing computational complexity, and achieve the effect of reducing computational complexity and improving PAPR suppression performance

Inactive Publication Date: 2013-08-07
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0029] The purpose of the present invention is to solve the peak-to-average ratio problem of the FRFT-OFDM system, and propose a low-complexity peak-to-average ratio suppression method for the FRFT-OFDM system. The method is based on the fractional random phase sequence and the fractional circular convolution theorem, effectively reducing operational complexity

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  • Low-complexity peak-to-average ratio (PAPR) inhibition method of FRFT-OFDM (fractional Fourier transform-orthogonal frequency division multiplexing) system
  • Low-complexity peak-to-average ratio (PAPR) inhibition method of FRFT-OFDM (fractional Fourier transform-orthogonal frequency division multiplexing) system
  • Low-complexity peak-to-average ratio (PAPR) inhibition method of FRFT-OFDM (fractional Fourier transform-orthogonal frequency division multiplexing) system

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[0101] figure 1 Provided is the specific implementation block diagram of the "low-complexity peak-to-average ratio suppression method for FRFT-OFDM systems" proposed by the present invention, and its specific implementation methods are summarized as follows:

[0102] 1) At the sending end of the communication system, perform IDFRFT of N points on the digitally modulated complex data X of length N, and obtain the time-domain FRFT-OFDM symbol x(n) after subcarrier modulation; N is the number of subcarriers number; IDFRFT is the inverse discrete fractional Fourier transform; x(n) is the symbol of time domain FRFT-OFDM;

[0103] 2) According to the chirp periodicity, perform chirp period extension in time domain with order p on x(n), and express the obtained period extension sequence as x((n)) P,N , the time-domain chirp periodic extension corresponding to the p-order fractional Fourier transform in discrete form is:

[0104]

[0105] chirp: linear frequency modulation; x((n)...

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Abstract

The invention relates to a low-complexity peak-to-average ratio (PAPR) inhibition method of an FRFT-OFDM (fractional Fourier transform-orthogonal frequency division multiplexing) system, belongs to the technical field of broadband wireless digital communication, and can be used for reducing the PAPR of the FRFT-OFDM system. The method is based on the Fractional order random phase sequence and the Fractional order circular convolution theorem, and the operation complexity is effectively reduced. The method provided by the invention has the advantages that the system realization is simple, and the calculation complexity is low. According to the method, the reliability of the system is maintained, meanwhile, the PAPR of the system can be effectively reduced, and when the alternative signal numbers are identical, the method has the same PAPR inhibition performance as an SLM (selection mapping) method and has the better PAPR inhibition performance than a PTS (partial transmission sequence) method. In addition, compared with that of the SLM method and the PAPR method, the calculation complexity of the low-complexity PAPR inhibition method is greatly reduced.

Description

technical field [0001] The invention relates to a low-complexity peak-to-average ratio suppression method of an FRFT-OFDM system, belongs to the technical field of broadband wireless digital communication, and can be used to reduce the peak-to-average ratio of the FRFT-OFDM system. Background technique [0002] Traditional OFDM (Orthogonal Frequency Division Multiplexing) systems usually use discrete Fourier (Fourier) transform (DFT) to achieve time-frequency transformation, converting frequency-selective channels into multiple flat sub-channels, and then converting serial high-speed The data streams are converted into multiple parallel low-speed data streams, which makes the OFDM system have good performance against multipath fading. However, in the time-frequency dual dispersive channel, the orthogonality between subcarriers in OFDM system is easily destroyed, resulting in serious inter-subcarrier interference. In order to overcome this problem, Martone Massimiliano propo...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/263H04L27/2614H04L27/2651
Inventor 陶然赵越王腾
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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