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Digital predistortion device with drain modulation function

A digital pre-distortion and drain modulation technology, applied in multi-frequency code systems, synchronization/start-stop systems, etc., can solve the problems of reducing peak-to-average ratio and signal distortion, cannot be achieved at the same time, signal distortion, etc., to ensure dynamic range, Improve power amplifier efficiency and reduce the effect of signal waveform distortion

Inactive Publication Date: 2012-03-28
SHANGHAI RADIO EQUIP RES INST
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AI Technical Summary

Problems solved by technology

However, digital wave clipping processing will bring certain signal distortion, so the peak-to-average ratio of the signal can only be reduced to a certain extent
[0005] It can be seen that the current power amplifier system with pre-distortion function cannot effectively solve the contradiction between peak-to-average ratio and power amplifier efficiency, and cannot simultaneously improve the linearity of the power amplifier, improve the dynamic effect of the power amplifier, and reduce the peak-to-average ratio and signal distortion. Effect

Method used

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  • Digital predistortion device with drain modulation function
  • Digital predistortion device with drain modulation function
  • Digital predistortion device with drain modulation function

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Embodiment Construction

[0020] The following combination Figure 1 ~ Figure 2 , a preferred embodiment of the present invention is described in detail.

[0021] Such as figure 1 As shown, the digital predistortion device with drain modulation function provided by the present invention is connected with the power amplifier 4 through a circuit, and specifically includes a digital baseband signal processor 1, a signal conversion module 2 and a radio frequency conversion module connected through a circuit in sequence 3. In this embodiment, the power amplifier 4 is a power amplifier tube of the type Freescale MRF7S21210.

[0022] Wherein, the digital baseband signal processor 1 is composed of FPGA (Field Programmable Gate Array, Field Programmable Gata Array), includes a digital clipping module 11 integrated in the FPGA, and is connected with the output of the digital clipping module 11 respectively. The predistortion processing module 12 and the drain modulation module 13 are connected through a circu...

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Abstract

The invention relates to a digital predistortion device with a drain modulation function, which is connected with a power amplifier and comprises a digital baseband signal processor, a signal transformation module and a radio frequency and frequency conversion module which are sequentially connected by a circuit, wherein the digital baseband signal processor contains a digital clipping module as well as a predistortion processing module and a drain modulation module which are respectively connected with the output end of the digital clipping module by the circuit. When carrying out digital clipping and predistortion process, the device also can carry out drain modulation on the power amplifier, and can simultaneously achieve the benefits of improving power amplifier linearity and power amplifier dynamic effect as well as reducing peak-to-average power ratio (PAPR) and signal distortion.

Description

technical field [0001] The invention relates to a digital predistortion device with a drain modulation function, and belongs to the technical field of power amplifier linearization. Background technique [0002] In the new generation of wireless communication, new modulation techniques such as OFDM (Orthogonal Frequency Division Multiplexing) are widely used, which can improve the spectrum utilization and make the peak-to-average ratio of the signal larger, which affects the linearity of the power amplifier and Dynamics make higher demands. In wireless communication, in order to meet the requirements of large peak-to-average ratio, large dynamics, and high linearity, the power amplifier has to be rolled back, which leads to a sharp drop in power amplifier efficiency. [0003] The use of digital pre-distortion technology can effectively compensate the nonlinear effect of the power amplifier, so that the linearity of the power amplifier can be improved, and the efficiency can...

Claims

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Application Information

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IPC IPC(8): H04L25/49H04L27/26
Inventor 吴晔韩非夏红娟
Owner SHANGHAI RADIO EQUIP RES INST
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