Method for reducing peak-to-average power ratio of filter bank multicarrier system

A multi-carrier system and peak-to-average power ratio technology, applied in the field of communication, can solve the problems of keeping subcarriers orthogonal, large out-of-band leakage, OFDM system spectrum offset sensitivity, etc., to reduce PAPR, not cause signal distortion, and small The effect of the number of iterations

Pending Publication Date: 2021-08-06
上海微波技术研究所(中国电子科技集团公司第五十研究所)
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Problems solved by technology

[0002] Due to the rectangular filter used in the OFDM system, its spectrum has a large side lobe, which causes a large out-of-band leakage, which further makes the OFDM system sensitive to spectrum offset, and it is difficult to maintain subcarrier orthogonality in complex fading channels. , at the same time, due to the existence of CP, the spectrum utilization of the system is reduced to some extent

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  • Method for reducing peak-to-average power ratio of filter bank multicarrier system
  • Method for reducing peak-to-average power ratio of filter bank multicarrier system
  • Method for reducing peak-to-average power ratio of filter bank multicarrier system

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[0054] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0055] Assume that in the FBMC-OQAM system, there are M complex input signal data blocks that need to be transmitted through N subcarriers:

[0056]

[0057] in, with Respectively represented as the real part and the imaginary part of the signal transmitted by the mth data block through the nth subcarrier. The complex input signal of the mth data block is defined as a vector C m :

[0058]

[0059] in,(·) T Defined as the transpose operation of a matrix.

[0060] Although the FBMC-OQAM tec...

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Abstract

The invention provides a method for reducing the peak-to-average power ratio of a multi-carrier system of a filter bank. The method comprises the following steps: setting an initial amplitude limiting amplitude A (1), the maximum number of iterations Q, a peak regeneration suppression factor xi, a penalty factor eta and a search step length rho; shearing the original signal, wherein the processed signal can be expressed as Sn after being processed by the FBMC-OQAM system, the FBMC-OQAM signal iteration amplitude limiting recursion updating formula can be expressed as the conversion of the shearing noise into the frequency domain signal to solve the optimal convergence factor mu; solving the optimal value A (i) of the amplitude limiting threshold value; and letting i = i + 1, repeating the above steps, and entering the next round of loop iteration until the algorithm converges. According to the method, a system model of the reserved subcarriers of the FBMC-OQAM system is constructed, a self-adaptive subcarrier reservation algorithm is provided based on essential reasons of the FBMC-OQAM and in combination with signal structure characteristics of the FBMC-OQAM, the PAPR of the system is reduced with a small number of iterations by performing self-adaptive learning on input data and adjusting an iteration threshold value and an amplitude limiting factor, and signal distortion is not caused.

Description

technical field [0001] The invention relates to the technical field of communication technology, in particular to a method for reducing the peak-to-average power ratio of a filter bank multi-carrier system. Background technique [0002] Due to the rectangular filter used in the OFDM system, its spectrum has a large side lobe, which causes a large out-of-band leakage, which further makes the OFDM system sensitive to spectrum offset, and it is difficult to maintain subcarrier orthogonality in complex fading channels. , and at the same time, due to the existence of CP, the spectrum utilization rate of the system is reduced to some extent. [0003] Due to the various defects of the OFDM system, OFDM will not be able to adapt to the development needs of future communications. For the improvement of OFDM, relevant research institutions in Europe have proposed a new multi-carrier technology, that is, filters using non-rectangular prototype signals Group multi-carrier technology. ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L27/34
CPCH04L27/2618H04L27/2621H04L27/264H04L27/3411
Inventor 吴垒黄静静
Owner 上海微波技术研究所(中国电子科技集团公司第五十研究所)
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