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Method and apparatus for reducing peak average power ratio of multi-carrier system

A technology of multi-carrier system and peak-to-average power ratio, applied in the direction of multi-frequency code system, etc., can solve the problems of peak regeneration and reduction of peak-to-average power ratio in multi-carrier system, and achieve the effect of reducing the regeneration peak value and reducing the complexity

Inactive Publication Date: 2009-04-22
COMBA TELECOM SYST CHINA LTD
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method and device for reducing the peak-to-average power ratio of a multi-carrier system, which can solve the peak regeneration problem generated during interpolation filtering

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  • Method and apparatus for reducing peak average power ratio of multi-carrier system
  • Method and apparatus for reducing peak average power ratio of multi-carrier system
  • Method and apparatus for reducing peak average power ratio of multi-carrier system

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Embodiment Construction

[0023] The input signal of the OFDM / OFDMA system has a relatively large peak-to-average power ratio after being transformed into a time-domain signal by the inverse Fourier transform IFFT. The present invention first cuts the peak through the TR algorithm to reduce its PAPR, and after interpolation and filtering, the peak value will regenerate. When using the nonlinear algorithm to cut the peak again, the PAPR is reduced below the target threshold.

[0024] Specific process such as figure 1 Shown: the present invention modulates the input signal, and transforms it into a time-domain signal through IFFT (step 1); since the time-domain signal usually has a relatively large PAPR, at first the time-domain signal is peak clipped by the TR algorithm ( Step 2); PAPR is reduced below the threshold value, it is worth pointing out that, in order to reduce the probability of the signal whose PAPR value exceeds the threshold value during peak regeneration, the threshold value of TR peak c...

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Abstract

The invention provides a method used for reducing peak-to-average power ratio of a multi-carrier system, comprising the steps as follows: firstly, input signals are modulated and converted into time domain signals; subsequently, peak clipping is carried out on the time domain signal by a TR algorithm; subsequently, the peak-clipped signals are interpolated and filtrated; furthermore, peak clipping is carried out on the filtrated signals by a nonlinear algorithm. The invention also provides a device used for reducing the peak-to-average power ratio of a multi-carrier system, comprising a first peak clipping device which is used for clipping the peak of the input time domain signals by the TR algorithm, and a radio frequency remote module which is connected with the first peak clipping module and is used for carrying out interpolation and filtration on the peak-clipped signals, and a second peak clipping module which is connected with the radio frequency remote module and is used for clipping peak of the filtrated signals by the nonlinear algorithm. The method and the device can effectively reduce the regeneration peak which affects the system performance little owning to extremely small possibility of the regeneration peak.

Description

technical field [0001] The invention relates to a method and device for reducing the peak-to-average power ratio PAPR based on an OFDM / OFDMA multi-carrier system. Background technique [0002] Since OFDM / OFDMA is a multi-carrier system, its signal appears as the superposition of N orthogonal sub-carrier signals in the time domain. When the N subcarrier signals are all summed with the same phase, the peak power of the resulting signal is N times the average power. Usually, there is a proportional relationship between PAPR and the number N of carriers. Although the probability of this happening in practice is very low, in order to transmit these peak-to-average ratio OFDM / OFDMA signals without distortion, the linearity requirements of some components are very high, such as power amplifiers, digital-to-analog converters and analog Digital converters etc. have a large linear dynamic range. If the signal range exceeds the linear range of the device, significant in-band distort...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
Inventor 骆晓青施英
Owner COMBA TELECOM SYST CHINA LTD
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