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Feedback type pre-distortion linearization method

A pre-distortion and linearization technology, which is used in improving amplifiers to reduce nonlinear distortion, power amplifiers, etc., and can solve the problems of difficult-to-predistort signal amplitude and phase control, difficulty in millimeter-wave frequency amplitude and phase control, and difficulty in achieving accurate compensation. , to achieve a wide range of effects

Inactive Publication Date: 2016-02-03
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

Secondly, due to the difficulty in controlling the amplitude and phase of the millimeter wave frequency, it is difficult for the traditional millimeter wave predistortion circuit to achieve precise control of the amplitude and phase of the predistortion signal, and it is difficult to achieve the purpose of accurate compensation

Method used

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  • Feedback type pre-distortion linearization method
  • Feedback type pre-distortion linearization method

Examples

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Embodiment

[0023] Use ADS software to simulate the feedback predistortion linearization loop, the simulation schematic diagram is as follows figure 2shown. In the simulation, the target power amplifier selects the millimeter wave power amplifier TGA4916. The amplification gain of the first amplifier is 22dB, the amplification gain of the second amplifier is 32dB; the frequency conversion loss of the down-converter is 8dB, and the frequency conversion loss of the up-converter is 8dB; the coupling coefficient of the first directional coupler is 10dB; the coupling coefficient of the second directional coupler 10dB; the role of the filter is completed by a low-pass filter with a cutoff frequency of 9MHz and a DC blocking capacitor; the power divider is an equal power divider.

[0024] When the input signal is set as an equal-power two-tone signal with a frequency of 29.9975GHz and 30.0025GHz, the phase shift of the phase shifter is set to 89°, and the attenuation of the attenuator is set t...

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Abstract

The invention discloses a novel feedback type pre-distortion linearization method. The method can satisfy linearization requirements of a millimetre-wave power amplifier / system and can be widely applied to a modern millimetre-wave wireless communication transmitting system, in particular a complex multi-carrier modulation system. Generation of an accurate pre-distortion signal is the key and the difficulty of a millimetre-wave pre-distortion linearization technology. According to the invention, sampling of a nonlinear distortion signal of the power amplifier is realized by adopting a zero-intermediate-frequency extraction technology; control of the amplitude and the phase of a distortion sampled signal is realized by adopting an intermediate-frequency amplitude and phase control technology; the pre-distortion signal is accurately generated in combination with an up-conversion technology; therefore, a feedback type pre-distortion linearization architecture is formed; and thus, the self-adaptive linearization effect is realized. The feedback type pre-distortion linearization method disclosed by the invention is low in influence on the output power of the millimetre-wave power amplifier and can be applied to a millimetre-wave high-power transmitting system; the pre-distortion signal can be generated in a wide frequency band; requirements of a broadband communication system can be satisfied; controllable pre-distortion linearization of a millimetre-wave broadband is realized; and the feedback type pre-distortion linearization method is simple in circuit structure and can be realized through the existing processes and technological conditions.

Description

technical field [0001] The invention relates to the technical field of microwave power amplifier linearization, in particular to a feedback type predistortion linearization method, which is applicable to the technical field of millimeter wave power amplifier linearization. Background technique [0002] The development direction of modern wireless communication system is multi-user, large capacity and high data transmission rate, which requires the system to adopt multi-carrier complex digital modulation and broadband transmission technology, which requires the system to work at a higher frequency, and at the same time, it also requires the system to be implemented in signal transmission and The linearity of the processing places extremely high demands. [0003] In wireless communication systems, the nonlinearity of power amplifiers for transmission is the primary factor affecting communication quality, and improving the linear performance of power amplifiers is the key to im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/32H03F3/20
Inventor 谢小强佘宇琛杨贵挺杨迎杨超穆继超
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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