Nonlinear detecting method of repeater power amplifier

Abstract

The invention provides a nonlinear detecting method of a repeater power amplifier. The method can monitor a nonlinearity and digital pre-distortion rectifying result of the power amplifier and judge whether the result is reasonable or not by virtue of a three-order intermodulation valve of a double-tone signal, and the method comprises the following steps: signal preprocessing, FFT simplifying after determination of resolution ratio and intermodulation calculation. Besides a repeater, the nonlinear detecting method is also applicable to a plurality of wireless communication systems comprising a large-power power amplifier. The nonlinear detecting method has the beneficial effects that the intermodulation simplifying detecting algorithm complexity in the numeric field is low, the operating rate is quick, the implementability is achieved, an instrument is not required by the algorithm, nonlinearity degree of the power amplifier can be monitored visually by a repeater system, and the linearity rectifying degree of the power amplifier can be monitored by a digital pre-distortion algorithm simultaneously. By utilizing the nonlinear detecting method, the intermodulation magnitude can be calculated conveniently, the algorithm complexity is low, the source consumption is less, the method is easy to realize, and the stability of the repeater system and the digital pre-distortion algorithm is improved simultaneously.

Description

Technical field [0001] The invention relates to a non-linear detection technology of a power amplifier in a repeater in the field of wireless communication technology, and mainly relates to a non-linear detection method of a power amplifier of a repeater. Background technique [0002] An ideal power amplifier should have a linear relationship between output and input, and its linear gain G has nothing to do with the amplitude A(t) or frequency f of the excitation signal. It is a constant, that is, y=G*A(t). But in the actual circuit, due to the working mechanism of the semiconductor transistor, the transmitter's power amplifier will appear nonlinear after saturation, and the output signal will be a nonlinear function of the input signal. [0003] Harmonic component [0004] A distinctive feature of a nonlinear system is that it can generate an excitation frequency and some harmonics of the excitation frequency. The output voltage of a nonlinear system is expressed by the power seri...

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Problems solved by technology

[0024] All ω1±ω2, 2ω1, 2ω2, 2ω1+ω2, 2ω2+ω1, and 3ω1 and 3ω2 frequency components fall outside the passband and interfere with signals in other frequency bands in a system whose operating frequency band is less than one octave. They can be filtered out by adding appropriate filters, but all the third-order intermodulation components with frequencies of 2ω1-ω2 and 2ω2-ω1 fall within the passband, and we cannot use filters to filter them out, and it is extremely It is possible to distort the desired baseband signals ω1 and ω2

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