A peak-to-average ratio suppression method based on optimal amplitude distribution of OFDM signals

A peak-to-average ratio suppression, optimal distribution technology, applied in modulation carrier systems, digital transmission systems, electrical components, etc., can solve the problems of signal distortion, low efficiency of transmitter power amplifier, etc., to improve efficiency, solve low power amplifier efficiency, The effect of improving amplifier performance

Active Publication Date: 2018-12-25
COMMUNICATION UNIVERSITY OF CHINA
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Problems solved by technology

[0006] In view of the above analysis, the embodiment of the present invention aims to provide a peak-to-average ratio suppression method based on the optimal distribution of OFDM signal amplitude to solve the problems of low transmitter power amplifier efficiency and signal distortion in the prior art

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  • A peak-to-average ratio suppression method based on optimal amplitude distribution of OFDM signals
  • A peak-to-average ratio suppression method based on optimal amplitude distribution of OFDM signals
  • A peak-to-average ratio suppression method based on optimal amplitude distribution of OFDM signals

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Embodiment 1

[0071] A specific embodiment of the present invention, such as figure 1 As shown, a peak-to-average ratio suppression method based on the optimal distribution of OFDM signal amplitude is disclosed, including the following steps:

[0072] S1. Perform IFFT transformation on the input OFDM frequency-domain signal, and complete q-fold upsampling processing to obtain the up-sampled OFDM time-domain signal.

[0073] S2. Perform time-domain clipping processing on the up-sampled OFDM time-domain signal through a clipping function trained offline to obtain the clipped OFDM time-domain signal.

[0074] S3 sequentially performs low-pass filtering, q-fold down-sampling, and FFT transformation processing on the limited OFDM time-domain signal to obtain a limited and discrete frequency-domain signal.

[0075] S4. Optimizing the above-mentioned clipped and discrete frequency-domain signal through an ACE algorithm trained offline to obtain an ACE-optimized frequency-domain signal.

[0076] ...

Embodiment 2

[0081] Improvements are made on the basis of the foregoing embodiments, such as figure 2 As shown, the offline training is carried out to the clipping function and the ACE algorithm, and the steps of obtaining the clipping function and the ACE algorithm trained offline include:

[0082] S01. Set the initial form and initial parameters of the clipping function and the ACE algorithm, and the corresponding form change rules and parameter change rules during iteration.

[0083] S02. For the limiting function and the ACE algorithm including the initial form and initial parameters, the input training OFDM frequency domain signal is converted into a time domain signal and upsampled, and the obtained upsampled time domain signal is obtained by including The clipping function of the initial form and the initial parameters performs time-domain clipping processing to obtain the clipped time-domain signal.

[0084] S03. Perform low-pass filtering, down-sampling, and FFT transformation p...

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Abstract

The invention relates to a peak-to-average ratio suppression method based on the optimal amplitude distribution of an OFDM signal, which solves the problems of low power amplifier efficiency and signal distortion of a transmitter in the prior art. The purpose of peak-to-average ratio suppression proposed by the peak-to-average ratio suppression method disclosed by the present invention is not to reduce the highest peak value, but rather improves the efficiency of amplifying the OFDM signal, as well as consider the maximum peak signal during implementation, also consider the probability of occurrence but not the largest amplitude of the sub-peak signal, the constraint of Euclidean distance of constellation point vector in frequency domain on the amplitude distribution curve of OFDM signal is explored, and the optimal amplitude distribution probability curve of OFDM signal satisfying the highest efficiency of power amplifier is obtained. Based on this criterion, the limiting function andACE algorithm of M iterations are trained. The test results show that, in QPSK modulation, 3.15 dB of IBO performance improvement is obtained compared with the original OFDM system after the final time domain transmission signal is optimized by the invention, and the IBO of the single carrier system is only 0.05 dB less than the original OFDM system under the same conditions.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a peak-to-average ratio suppression method based on the optimal distribution of OFDM signal amplitude. Background technique [0002] Multi-carrier technology is the preferred core technology in the field of wireless transmission in the future, with high spectrum utilization and the ability to communicate in complex environments. However, when the number of subcarriers reaches a certain level, the OFDM modulated signal will produce a large peak value, so that the power amplifier of the transmitter must work in a high power back-off state to ensure a sufficient linear dynamic range. [0003] When amplifying OFDM signals, if the linearity of the amplifier is not good, in addition to intermodulation interference, if the amount of back-off is not enough, nonlinear distortion and cut-off distortion will also occur, resulting in spectrum expansion and adjacent frequency i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2602H04L27/2614
Inventor 胡峰蔡超时刘昌银宋洋
Owner COMMUNICATION UNIVERSITY OF CHINA
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