Method for reducing intermodulation distortion signal of signal receiving end

A signal receiving end, intermodulation distortion technology, applied in the direction of electrical components, transmission systems, etc., can solve problems such as complex structure, difficult implementation, and difficulty in supporting high-speed wireless communication, and achieve the effect of reducing interference and improving channel quality

Pending Publication Date: 2021-07-13
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The structure of the circuit is also complex, it is difficult to realize, and it is difficult to support high-speed wireless communication working at high frequency

Method used

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  • Method for reducing intermodulation distortion signal of signal receiving end
  • Method for reducing intermodulation distortion signal of signal receiving end
  • Method for reducing intermodulation distortion signal of signal receiving end

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Embodiment

[0028] Such as image 3 As shown, the invention discloses a method for reducing intermodulation distortion signals at the signal receiving end, which includes a mixer and an absorptive circuit connected to the input, output, and local oscillator ports of the mixer. It should be noted that the signals at each port of the mixer can be differential, full-orthogonal differential, or single-ended. Wherein, according to the characteristics of the frequency mixing signal, the absorptive circuit can adopt any one of high-pass response absorptive circuit, low-pass response absorptive circuit, and band-pass response absorptive circuit; and the port of the mixer can be Terminate different numbers of absorptive circuits.

[0029] Such as Figure 4 As shown, in the present invention, reflected signals will be reflected multiple times between the mixer and each port signal processing circuit to form a standing wave, and these reflected signals will participate in frequency mixing in the m...

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Abstract

The invention discloses a method for reducing an intermodulation distortion signal of a signal receiving end, which can inhibit the generation of a multi-order intermodulation product and improve the channel quality under the condition of not obviously increasing the circuit complexity. A frequency mixer and an absorptive circuit connected to input, output and local oscillation ports of the frequency mixer are included. It needs to be noted that the signal of each port of the mixer can be differential and can also be fully orthogonal differential. According to the characteristics of the frequency mixing signal, the absorptive circuit can adopt any one of a high-pass response absorptive circuit, a low-pass response absorptive circuit and a band-pass response absorptive circuit. Through the above design, the absorption circuit is connected with each port of the mixer to realize non-reflection of each port, thereby reducing the interference of a multi-order intermodulation distortion signal introduced by out-of-band reflection on an in-band signal, absorbing and dissipating the out-of-band signal by using the resistive load without affecting the transmission of a passband signal, and improving the channel quality. Therefore, the method is suitable for popularization.

Description

technical field [0001] The invention relates to the technical field of wireless communication systems, in particular to a method for reducing intermodulation distortion signals at a signal receiving end. Background technique [0002] The rapid development of wireless communication has driven the extensive use of broadband systems. Modern wireless communication systems, especially the receiving end, are prone to receive other interference signals from the working frequency band while receiving useful signals. These interfering signals will generate a large number of intermodulation products in the link nonlinear components (such as mixers, etc.), and part of the intermodulation products will fall into the spectrum of the useful signal, causing strong interference to the useful signal and deteriorating the quality of the communication channel. The intermodulation product includes the intermodulation distortion of the input signal and the intermodulation distortion caused by th...

Claims

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Application Information

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IPC IPC(8): H04B1/10
CPCH04B1/10
Inventor 邓至贤钱慧珍罗讯
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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