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Distortion signal cancellation method based on dual non-in-phase processing

A technology for non-in-phase processing and distorting signals, applied in electrical components, transmission systems, etc., can solve problems such as second-order intermodulation distortion and second-order harmonic distortion, and achieve the effect of improving linearity and signal-to-noise ratio.

Inactive Publication Date: 2020-10-09
成都星象科技有限公司
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Problems solved by technology

[0004] The object of the present invention is to provide a method for canceling distortion signals based on two non-in-phase processing, which solves the problem that the amplifiers, filters, and program-controlled attenuators in the radio frequency processing chain all have nonlinear characteristics and will generate second-order Problems with Harmonic Distortion and Second-Order Intermodulation Distortion

Method used

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  • Distortion signal cancellation method based on dual non-in-phase processing
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  • Distortion signal cancellation method based on dual non-in-phase processing

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Embodiment

[0026] Such as figure 2 As shown, a method for canceling distorted signals based on two-way non-in-phase processing provided by the present invention comprises the following steps:

[0027] The input signal of the single-tone signal will be divided into two signals with the same amplitude and a phase difference of π through a two-power divider;

[0028] The two signals are processed through corresponding radio frequency processing links to obtain two output signals;

[0029] The two output signals are subtracted to obtain a linear response output signal.

[0030] Among them, such as figure 1 As shown, the characteristics of the radio frequency processing link are:

[0031]

[0032] Among them, x(t) is the input signal of the RF processing link, y(t) is the output signal of the RF processing link, α n is the gain of the nth harmonic response.

[0033] In this embodiment, it should be noted that the industry generally ignores the high-order harmonic response and the int...

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Abstract

The invention discloses a distortion signal cancellation method based on dual non-in-phase processing, which belongs to the technical field of non-in-phase processing distortion signal cancellation, and comprises the following steps of: dividing an input signal which is a single-tone signal into two signals with the same amplitude and a phase difference of pi through a one-to-two power divider; processing the two signals by corresponding radio frequency processing links to obtain two output signals; and subtracting the two output signals to obtain a linear response output signal. A two-phase signal processing method with the phase difference of pi is adopted, the signal-to-noise ratio can also be improved, all second harmonic distortion and second-order intermodulation distortion which aregenerated by an amplifier, a filter, a programmable attenuator and the like in a radio frequency processing link and have non-linear characteristics are cancelled out, and the linearity is improved.

Description

technical field [0001] The invention belongs to the technical field of non-in-phase processing distortion signal cancellation, and relates to a method based on two-way non-in-phase processing distortion signal cancellation. Background technique [0002] Communication systems include various circuits such as receivers, demodulators, and baseband amplifiers that have non-linearities that cause "unwanted signals." The non-linear behavior of this circuit induces intermodulation products and system noise, increasing the amount of signal distortion and degrading system performance. Unwanted signals that appear at multiple input frequencies are called harmonic distortion (HD). Unwanted signals that appear at frequencies that are a linear combination of the input frequencies are called intermodulation distortion (IMD). Nonlinear distortion products include second-order intermodulation distortion (IMD2), second-order harmonic distortion (HD2), third-order intermodulation distortion...

Claims

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Application Information

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IPC IPC(8): H04B1/04H04B1/12
CPCH04B1/0475H04B1/12
Inventor 闫捌林应文俊
Owner 成都星象科技有限公司
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