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Vector hole adjustment method based on tangent principle

An adjustment method and vector technology, applied in the field of signal processing and communication system intersection, can solve the problem of signal too close to the origin, change the signal amplitude, etc., to reduce the in-band and out-of-band distortion of the signal, and improve the optimization effect.

Inactive Publication Date: 2012-07-04
SOUTHEAST UNIV +1
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Problems solved by technology

[0003] Technical problem: The purpose of this invention is to provide a vector hole adjustment method based on the tangent principle, which not only changes the signal amplitude, but also further changes the signal phase, so as to really solve the problem that the signal is too close to the origin

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  • Vector hole adjustment method based on tangent principle
  • Vector hole adjustment method based on tangent principle
  • Vector hole adjustment method based on tangent principle

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Embodiment 1

[0033] Example 1 Figure 4 and Figure 5 The comparison effect of the vector diagrams of the 16QAM modulated LTE signal before and after being processed by the method of the present invention is given. The bandwidth of the LTE signal is 20MHz, the oversampling rate is 8, and the number of fast Fourier transform points is 2048, including 1201 data carriers and 847 empty carriers. We use 260 of the empty carriers, and the threshold is set to signal 10% of the maximum amplitude. , the amplitude change threshold is set to 1% of the maximum amplitude of the signal, and the phase shift threshold is set to 1 degree.

[0034] a. Normalize the amplitudes of all signal sampling points, and define the signal amplitude lower limit threshold as 0.1.

[0035] b. Check all sampling points in turn, change the signal amplitude less than 0.1 to 0.1, and keep the phase unchanged.

[0036] c. Construct a circle c1 whose center is the origin and whose radius is 0.1 on the complex number plane. ...

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Abstract

The invention discloses a vector hole adjustment method based on a tangent principle, which can be applied to any communication system adopting the OFDM communication mode and a drain electrode modulated power amplifier, changes signal amplitude and further changes signal phase position so as to truly solve the problem that the signal is too close to the original point. The signal adjustment method manufacturing 'vector holes' on plural planes specifically comprises: a. defining the lower limit threshold value R of signal amplitude; b. successively checking all digital signal sampling points;c. refracting all signal sampling points to a complex number plane; d. using an iteration method, and using an adjusted signal point to change the phase position and amplitude of the next original signal point; e. converting all adjusted N digital sampling points into frequency domain signals Y1 with a quick Fourier transform method, and meanwhile, converting the preliminarily adjusted digital signal obtained in step b into frequency domain signals Y2; f. further adjusting the signal on the frequency domain; g. converting the frequency domain signal into a time domain signal with an inversed quick Fourier transform method; and h. repeating steps b to g until one clear vector hole can be seen on the complex number plane.

Description

technical field [0001] The method of the present invention can be applied to any communication system that uses OFDM transmission mode and drain modulation power amplifier, such as LTE system and WiMAX system that are likely to be used in future 4G systems, and the adjustment method belongs to the cross field of signal processing and communication systems. Background technique [0002] Orthogonal frequency division multiplexing (OFDM) technology divides the channel into many sub-channels, each sub-channel is kept orthogonal, and the spectrum overlaps with each other, which reduces the interference between sub-channels, improves the spectrum utilization rate and the ability to resist multipath attenuation . However, because a large number of sub-channels are independent of each other, the phase and amplitude of the superimposed signal are randomly distributed, so the OFDM signal has the characteristic of peak-to-average ratio. This would lead to low power efficiency in conve...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
Inventor 王晶琦祝安定朱晓维托马斯·布拉泽尔
Owner SOUTHEAST UNIV