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Method and transmitter of the stable transmission power

A transmission power and transmitter technology, applied in the direction of transmission control/equalization, synchronization/start-stop system, etc., can solve the problems of power control error, not the same segment of the signal, and the detection signal cannot reflect the rapid change of the signal envelope, etc., to achieve The effect of power control and transmission power stability

Active Publication Date: 2010-04-07
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In the process of realizing the present invention, the inventor found that there are at least the following problems in the prior art. Since the logarithmic detection unit is a slow device, the detection signal output by the logarithmic detection unit cannot reflect the rapid change of the signal envelope, and the asynchronous power comparison and The power detection digital signal obtained by the power control unit and the baseband signal after predistortion processing cannot be aligned in time, and they are not the same signal. By comparing the power of these two asynchronous signals, a digital power control signal and a radio frequency power control signal are obtained; When the digital power control signal and RF power control signal are used to adjust the transmission power, power control errors may be caused, resulting in the transmission power deviating from the design level

Method used

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  • Method and transmitter of the stable transmission power
  • Method and transmitter of the stable transmission power
  • Method and transmitter of the stable transmission power

Examples

Experimental program
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Effect test

Embodiment 1

[0017] Please refer to figure 2 , is a flowchart of the method for stabilizing transmission power according to Embodiment 1 of the present invention.

[0018] Step 201. Obtain the feedback digital intermediate frequency signal; obtain the time delay of the feedback digital intermediate frequency signal; obtain the predistorted baseband signal corresponding to the feedback digital intermediate frequency signal according to the time delay.

[0019] Step 202. Compare the power of the feedback digital intermediate frequency signal with the power of the predistorted baseband signal corresponding to the feedback digital intermediate frequency signal, and generate a comparison result.

[0020] Step 203. Use a power control algorithm to calculate the comparison result to generate a digital power control signal and a radio frequency power control signal; use the digital power control signal and the radio frequency power control signal to adjust the transmit power.

[0021] In order t...

Embodiment 2

[0026] Please refer to image 3 , is a schematic diagram of a transmitter according to Embodiment 2 of the present invention. The transmitter 300 includes a pre-distortion processing unit 301, a multiplier 302, a modulation and transmission digital-to-analog converter 303, a radio frequency transmission processing unit 304, a high-power amplifier 305, a pre-distortion coefficient calculation unit 306, a feedback analog-to-digital converter 307, Feedback receiver 308 , synchronous power comparison and power control unit 309 .

[0027] The pre-distortion processing unit 301 obtains the coded and modulated baseband signal, uses the pre-distortion coefficient generated by the pre-distortion coefficient calculation unit 306 to perform pre-distortion processing on the base-band signal, and generates a pre-distortion processed baseband signal; the pre-distortion processing is performed to compensate Distortion of the transmit channel.

[0028] The multiplier 302 acquires the pre-di...

Embodiment 3

[0038] This embodiment is based on the second embodiment. In order to avoid the influence of uncertain factors of the feedback channel on the power of the feedback digital intermediate frequency signal, the power of the feedback digital intermediate frequency signal may be corrected.

[0039] In this embodiment, the synchronous power comparison and power control unit obtains the correction coefficient of the feedback channel gain before comparing the power; when comparing the power, the power of the feedback digital intermediate frequency signal is multiplied by the correction coefficient to obtain the correction coefficient of the feedback digital intermediate frequency signal power, compare the corrected power of the feedback digital intermediate frequency signal with the power of the predistorted baseband signal corresponding to the feedback digital intermediate frequency signal, and generate a comparison result. Correspondingly, the synchronous power comparison and power c...

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Abstract

The present invention discloses a stable transmitting power method including: obtaining intermediate frequency of feedback figure; obtaining the time delay of the intermediate frequency signal of thefeedback figure; obtaining the baseband signal after the predistortion processing corresponding to the intermediate frequency signal of the feedback figure according to said time delay; comparing thepower of the intermediate frequency signal of the feedback figure with the power of the baseband signal after the predistortion processing corresponding to the intermediate frequency signal of the feedback figure to generate a result; computing the comparing result by using a power control algorithm to generate digital power control signals and radio frequency power control signals; adjusting thetransmit power by using said digital power control signals and radio frequency power control signals. The present invention further discloses a transmitter. In the present invention, the obtaining ofdigital power control signals and radio frequency power control signals can be realized through comparing the power of the synchronous signals.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a method and a transmitter for stabilizing transmission power. Background technique [0002] In wireless communication systems, in order to pursue high transmitter efficiency, digital predistortion technology is widely used. The digital pre-distortion technology is to perform digital pre-distortion on the baseband signal in advance to compensate for the distortion of the transmission channel including the high-power amplifier. Ideally, the signal obtained after passing through the power amplifier is the same as the signal before the digital pre-distortion. [0003] Please refer to figure 1 , is a schematic diagram of a transmitter in the prior art. The transmitter 100 includes a pre-distortion processing unit 101, a multiplier 102, a modulation and transmission digital-to-analog converter 103, a radio frequency transmission processing unit 104, a high-power amplifier 105, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/005H04L25/49
Inventor 叶四清
Owner HUAWEI TECH CO LTD