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Digital predistortion device in radio communication system

A wireless communication system, digital predistortion technology, applied in transmission system, communication between multiple stations, transmission control/equalization, etc., can solve the problem of large hardware cost, large transceiver volume, and circuit design complexity Advanced problems, to achieve the effect of simplifying circuit design and reducing hardware costs

Inactive Publication Date: 2011-12-07
POTEVIO INFORMATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] From the above analysis, it can be seen that when digital predistortion is implemented in a wireless communication system using a smart antenna in the prior art, it is necessary to provide N feedback loops for N downlinks, which makes the volume of the transceiver larger and the circuit design complicated The higher the degree, the greater the investment in hardware costs

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  • Digital predistortion device in radio communication system
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  • Digital predistortion device in radio communication system

Examples

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Embodiment 1

[0071] This embodiment describes in detail the specific implementation manner of applying the digital pre-distortion device of the present invention to an FDD system using a smart antenna.

[0072]As mentioned above, in the FDD system, the downlink is always in the working state, and in order to realize the digital pre-distortion, it is necessary to carry out adaptive training on each downlink separately. In order to solve this problem, the feedback time can be determined according to the preset period of the downlink time division multiplexing feedback loop and the number of downlink channels, and then the corresponding relationship between the feedback time and the downlink can be set according to the determined feedback time , and then set a single-pole multiple radio frequency switch with a certain isolation requirement between the output ports of each downlink power amplifier and the down-converter of the feedback loop, and set up a single-pole multiple radio frequency swi...

Embodiment 2

[0082] This embodiment describes in detail the specific implementation manner of applying the digital predistortion device of the present invention to a TDD system using a smart antenna.

[0083] In the TDD system, since the uplink and downlink do not work at the same time, and the uplink and downlink conversion has a guard interval for a certain period of time, therefore, the downlinks of the smart antennas can be controlled during the period of the guard interval, that is, the guard time slot. Train separately to achieve the best effect of digital predistortion. That is, the feedback time in this embodiment can be determined according to the preset period of the downlink time division multiplexing feedback loop, the number of downlink channels, and the guard time slot for switching between uplink and downlink. For example, the first guard time slot can be used as the first feedback time, the second guard time slot can be used as the second feedback time, and so on, and the N...

Embodiment 3

[0097] As mentioned above, in a wireless communication system using a smart antenna, it is usually necessary to provide a calibration link to calibrate the amplitude and phase characteristics of N transmission and reception links corresponding to N array elements in the smart antenna system. Figure 8 It is a schematic diagram of the composition structure of the calibration link in the existing wireless communication system. Figure 8 Some elements related to the calibration link in the wireless communication system are shown, including: a calibration link 810 , an antenna 820 , a digital signal processor 830 , and two switches 840 and 850 .

[0098] Wherein, the calibration link 810 is composed of a second down-converter 811, a second analog-to-digital converter 812, a second up-converter 813, and a second digital-to-analog converter 814; and, the output of the second down-converter 811 is the first The input of the second analog-to-digital converter 812, the output of the se...

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Abstract

The invention discloses a digital predistortion device of a wireless communication system, which includes: N channels of down links; feedback loops that are composed of a down converter, an analog-to-digital converter and a self-adapter and are arranged between N power amplifiers and N predistortion devices; the device also includes: a first control module, which can decide the feedback time according to the preset cycle of the down link time division multiplexing feedback loop and the channel number of the down links, set the corresponding relationship between the feedback time and the down links and generate a control signal for the down link corresponding to the current feedback time, a module for selecting one from more, which can select one channel from N channels of output signals as the input signal of the down converter according to the control signal and select one channel from N channels of input signals as the input signal for the self-adapter; the feedback loop is composed of a down converter, an analog-to-digital converter and a self-adapter. The system can realize the digital predistortion with simple circuit design and low cost of hardware.

Description

technical field [0001] The invention relates to digital pre-distortion technology, in particular to a digital pre-distortion device in a wireless communication system. Background technique [0002] In order to improve the data rate and spectrum efficiency of the digital wireless communication system, the linearity of the digital wireless communication system needs to be improved, therefore, various linearization techniques need to be implemented in the digital wireless communication system. figure 1 It is a schematic diagram of the composition and structure of a part of the downlink that does not use the linearization technology in the existing digital wireless communication system. see figure 1 , in this section of the downlink that does not use the linearization technology, it includes in turn: a digital-to-analog converter (DAC), an upconverter (Upconverter) and a power amplifier (PowerAmplifier). Among them, the high-power power amplifier, as the final amplifier of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/005H04L29/02H04B7/26
Inventor 孙晓飞曹雪周忠学
Owner POTEVIO INFORMATION TECH CO LTD
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