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Adaptive cancellation method and device for multi-carrier passive intermodulation interference

A passive intermodulation and interference cancellation technology, applied in the field of communication, can solve the problems such as the inability to adapt to the complex characteristics of multi-carrier PIM interference signals, the interference of passive intermodulation products, and the low isolation of the duplexer. Easy hardware implementation, stable computing performance, and low resource cost

Active Publication Date: 2019-11-15
京工科创(北京)信息科技有限公司
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Problems solved by technology

The isolation of the duplexer in the antenna sharing system is low, and the passive intermodulation products are easy to enter the receiving frequency band to form interference, and it is difficult to filter them out by frequency domain filtering, which will affect the communication system
In order to achieve PIM interference cancellation, some scientific research institutes and companies have applied for related patents and proposed some PIM interference cancellation methods based on signal processing. Not well adapted to the complex characteristics of multi-carrier PIM interference signals

Method used

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  • Adaptive cancellation method and device for multi-carrier passive intermodulation interference
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Embodiment Construction

[0038] The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are illustrated. The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention. The technical solution of the present invention will be described in various aspects below in conjunction with various figures and embodiments.

[0039] figure 1 It is a flow chart of an embodiment of an adaptive cancellation method for multi-carrier passive intermodulation interference acco...

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Abstract

The invention discloses an adaptive cancellation and apparatus for multi-carrier passive intermodulation interference. The method comprises: an effective passive intermodulation (PIM) interference component of a multi-carrier uplink signal at a receive frequency band is calculated by using a preset fast spectrum algorithm; a multi-carrier PIM interference signal is reconstructed based on a PIM model; interference cancellation processing is carried out on the multi-carrier uplink signal and the multi-carrier PIM interference signal based on a multi-carrier PIM interference self-adaptive cancellation algorithm; and the multi-carrier uplink signal is corrected based on the multi-carrier PIM interference signal after the interference cancellation processing. According to the adaptive cancellation and apparatus, the complicated PIM interference problem caused by the multi-carrier PIM in the duplexing system is considered fully; the computational complexity as well as the resource costs is low; and the method and apparatus are easy to realize by hardware; the multi-carrier passive intermodulation interference is cancelled accurately and the SINR gain is increased; the computing performance is stable and the system adaptability is high; and the multi-carrier PIM signal can be suppressed in real time.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to an adaptive cancellation method and device for multi-carrier passive intermodulation interference. Background technique [0002] Passive Intermodulation (PIM for short) refers to the elimination of signals generated when two or more frequency components pass through passive devices (such as duplexers, isolators, coaxial cables, connectors, antennas, loads, etc.) A phenomenon in which there are new frequency components outside the harmonics. The generated new frequency is a linear combination of the fundamental frequency, and interference is formed when the newly generated frequency falls within the passband of the communication receiver. [0003] With the continuous development of wireless communication and satellite communication, the size of the antenna required for communication becomes larger, and the technology of transmitting and receiving is used due to the limitat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J11/00H04B1/525H04B17/345H04B17/391H04L27/26
CPCH04B1/525H04B17/345H04B17/3912H04J11/0023H04L27/2691
Inventor 梁弼政李林涛胡东方王晓东
Owner 京工科创(北京)信息科技有限公司
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