Method for suppressing passive intermodulation interference based on adaptive filtering

An adaptive filtering and interference suppression technology, applied in electrical components, transmission systems, etc., can solve problems such as only considering second-order intermodulation, model simplification, etc., and achieve good real-time performance, low resource cost, and stable performance

Inactive Publication Date: 2014-08-13
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Method for suppressing passive intermodulation interference based on adaptive filtering
  • Method for suppressing passive intermodulation interference based on adaptive filtering
  • Method for suppressing passive intermodulation interference based on adaptive filtering

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[0035] Taking the S-band communication satellite transponder as an example, using the present invention "a passive intermodulation interference suppression method based on adaptive filtering" to realize passive intermodulation interference suppression, such as figure 1 shown.

[0036] Step 1. Using the characteristics of the transmitted signal, analyze the characteristics of PIM products of each order;

[0037] The parameters of the known transponder transmitter, that is, the characteristics of the transmitted signal are as follows:

[0038] (1) Center frequency of transmitting signal: S-band transmitting frequency range is 2030MHz~2060MHz. Taking the dual-carrier as an example, the center frequency of the transmitted signal of the dual-carrier is selected as, f 1 =2030MHz,f 2 =2060MHz;

[0039] (2) Modulation output symbol rate: 2.5Mbaud;

[0040] (3) Modulation method: BPSK;

[0041] (4) Channel coding method: none;

[0042] (5) Modulation shaping window function: roo...

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Abstract

The invention belongs to the technical field of wireless communication signal processing and the technical field of full-duplex communication systems and relates to a method for suppressing passive intermodulation interface in a full-duplex communication system, in particular to a technology for suppressing passive intermodulation interface based on adaptive filtering. A simplified model of a passive nonlinear device is established and used for conducting interference suppression according to a digital signal processing method. The self-adaptive filtering algorithm is adopted as the estimation algorithm which is effect and enables hardware implementation to be achieved easily, so that compensation for passive intermodulation interface on intermediate frequency signals is achieved. A simulation result shows that passive intermodulation interface can be effectively suppressed and certain signal-to-ratio gain is achieved. The method is simple, computation complexity is low, resource cost is low, hardware implementation is easily achieved, the method is stable in performance, the system is strong in adaptability, the real-time performance is good, the method can be used for effectively suppressing passive intermodulation interference, and the higher signal to interference ratio gain is achieved.

Description

technical field [0001] The present invention relates to a passive intermodulation interference suppression method in a full-duplex communication system, in particular to a passive intermodulation interference suppression technology based on adaptive filtering, which belongs to the technical field of wireless communication signal processing, especially full-duplex communication systems technology field. Background technique [0002] Passive intermodulation (PIM) refers to a family of products produced by two or more frequency components through the nonlinear effect of passive devices, and its frequency is a linear combination of the fundamental frequency. Interference occurs when the linear combination products fall within the passband of a communications receiver. Passive intermodulation exists widely in communication systems and is a phenomenon that is difficult to completely eliminate. It was first discovered in the 1970s. With the improvement of communication requiremen...

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Application Information

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IPC IPC(8): H04B1/10
Inventor 田露王帅卜祥元安建平曹文慧高晓铮
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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