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Method for reducing peak-to-average ratio of medium-voltage carrier signal

A carrier signal, peak-to-average ratio technology, applied in the modulation carrier system, digital transmission system, electrical components, etc., can solve the problems of low communication efficiency and bandwidth occupied by sideband information transmission, so as not to occupy bandwidth and reduce the amount of calculation Effect

Active Publication Date: 2021-03-23
QINGDAO TOPSCOMM COMM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the problem that the peak-to-average ratio of the OFDM signal is lowered by probabilistic technology, and the bandwidth occupied by sideband information transmission is low, and the communication efficiency is low. A method for reducing the peak-to-average ratio of the medium-voltage carrier signal is proposed, and the following technical scheme is adopted to realize it:

Method used

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  • Method for reducing peak-to-average ratio of medium-voltage carrier signal
  • Method for reducing peak-to-average ratio of medium-voltage carrier signal
  • Method for reducing peak-to-average ratio of medium-voltage carrier signal

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Embodiment 1

[0034] refer to Figure 11 , this embodiment proposes a method for reducing the peak-to-average ratio of the medium-voltage carrier signal.

[0035] At the transmitting end, obtain the initial phase of the subcarrier, and superimpose the subcarrier to obtain the superimposed transmission waveform; calculate the peak-to-average ratio of the transmitted data; add a row in the phase rotation matrix to the sine angle of the subcarrier, and again Calculate the peak-to-average ratio, bring each row in the phase rotation matrix into the calculation formula of the waveform, obtain m groups of waveforms, save the calculation results of the peak-to-average ratio of each group, compare them, and take the group with the smallest peak-to-average ratio , select the waveform obtained using this set of rotation vectors.

[0036] At the receiving end, demodulation is performed after receiving the signal. After demodulation, the number of subcarriers falling on the x-axis, y-axis, and π / 4 odd ...

Embodiment 2

[0052] Embodiment 2. The difference from Embodiment 1 is that this embodiment is aimed at the case of 20 subcarriers. When constructing the Z matrix, the number of odd multiples of π / 4 in each group of rotation vectors is different. ,Such as:

[0053]

[0054] Z contains three groups of rotation vectors, the number of elements whose multiple of π / 4 is an odd number in the first group is 8, and the number of elements whose multiple of π / 4 is an odd number in the second group is 9, The number of elements whose multiple of π / 4 is an odd number in the third group is 11. The group of vectors used by the sending end is marked with an odd number of π / 4 in each group of vectors, so that redundant information does not need to be transmitted, which can reduce bandwidth loss.

[0055] original phase, e.g. It will only fall on the x and y axes, such as Figure 7 As shown, when a rotation matrix is ​​used, a rotation vector with an odd multiple of π / 4 will cause the symbol to fall o...

Embodiment 3

[0060] The difference from Embodiments 1 and 2 is that this embodiment only includes the transmitting end, and the transmitting end includes the step of obtaining the initial phase of the subcarrier; the step of obtaining the transmitted waveform after the superposition of the subcarrier; and the following steps: selecting the A group of rotation vectors in the phase rotation matrix is ​​added to the sine angle of the subcarrier, and the peak-to-average ratio is calculated, and the group with the smallest peak-to-average ratio is selected, and the waveform obtained by using this group of rotation vectors is selected for transmission; each group in the phase rotation matrix The number of odd multiples of π / 4 included in the rotation vectors is different.

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Abstract

The invention provides a method for reducing a peak-to-average power ratio of a medium-voltage carrier signal. At a transmitting end, the method comprises the following steps of: step A1, acquiring aninitial phase of a subcarrier; step A2, acquiring a sending waveform after subcarrier superposition; and step A3, selecting and adding a group of rotation vectors in a phase rotation matrix to a sineangle of the subcarrier, calculating a peak-to-average ratio, taking the group with the minimum peak-to-average ratio, and selecting and sending a waveform obtained by using the group of rotation vectors, wherein the number of odd times pi / 4 contained in each group of rotation vectors in the phase rotation matrix is different. At the transmitting end, most of high peak-to-average ratio waveformsare changed into low peak-to-average ratio waveforms through a phase rotation matrix, and a rotation phase group in the phase rotation matrix carries number information, so that additional sideband information does not need to be added in the transmission process, the bandwidth is not occupied, the communication rate is not reduced, the waveforms are not changed at all, and communication data quality can not be lost.

Description

technical field [0001] The invention belongs to the field of multi-carrier communication, in particular to a method for reducing peak-to-average ratio in multi-carrier OFDM. Background technique [0002] When multi-carrier communication with quadrature phase shift keying digital modulation is used, the peak-to-average ratio will be relatively high, and the high peak-to-average ratio will cause the receiving device to clamp, resulting in data distortion and information loss. The peak-to-average ratio is one of the inherent problems of multi-carrier communication, and it has always been a research hotspot in the academic circle. At present, a variety of techniques for reducing the peak-to-average ratio of OFDM signals have been proposed, such as: clipping techniques, coding techniques, and probability techniques. [0003] The clipping technology directly cuts the over-limit peak of the signal. This technology is the most direct and simplest, but it will bring in-band noise an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2601H04L27/2614Y02D30/70
Inventor 李亮于洋徐剑英张建李伟吴雪梅卢峰林志超程艳艳叶齐
Owner QINGDAO TOPSCOMM COMM
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