Method, device and application apparatus for adaptively canceling passive intermodulation signal

Abstract

The invention relates to the technical field of communication, specifically relates to a method, a device and an application apparatus for adaptively canceling a passive intermodulation signal. The device for adaptively canceling the passive intermodulation signal comprises a first coupler, a second coupler, a duplexer, an antenna, an antenna feeder component, a canceller circuit, a receiving unit, a passive intermodulation detection circuit, a digital processing unit, a transmitting circuit unit and a transmit-receiving module. One primary path port of the first coupler is connected to an antenna port of the duplexer, the other primary path port is connected to the antenna feeder component on an antenna link. A coupling port of the first coupler is connected to a radio frequency port of the canceler circuit. One primary path port of the second coupler is connected to a receiving port of the duplexer, and the other primary path port is connected to the passive intermodulation detectioncircuit. The device for adaptively canceling a passive intermodulation signal can cancel the component dropt-in a receiving frequency band of the passive intermodulation signal generated by a wireless transceiver and other apparatuses or components on the link from the antenna port of the device to the antenna.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method, device and application equipment for adaptively canceling passive intermodulation signals. Background technique [0002] In the communication system, a large number of wireless transceiver devices are used. The wireless transceiver device itself contains devices that generate passive intermodulation signals, such as radio frequency duplexers, filters, combiners, etc.; the link from the antenna port of the wireless transceiver device to the antenna also contains many components that generate passive intermodulation signals. Devices such as couplers, RF cables, tower mount amplifiers, etc. For the wireless transceiver system, how to suppress the intermodulation interference to the receiver of the wireless transceiver device caused by the transmitted signal in the wireless transceiver system has always been a key issue of this type of system. Therefore, when the w...

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Problems solved by technology

[0004] This technical solution has the following deficiencies: 1. This technical solution is not suitable for passive devices, and it does not consider the difference in intermodulation values ​​at different positions inside the nonlinear unit. This difference is obvious for passive devices. In passive circuits , the amplitude attenuation and phase change of the transmitted signal are very large

[0006] This technical solution has the following disadvantages: 1. This technical solution uses a passive regulator, and the amplitude adjustment and phase adjustment are passive devices. If you want to realize the amplitude adjustment and phase adjustment, you need to drive the passive regulator with external force, such as using a motor drive , or directly rely on manual drive, these methods will make the actual application cost high, and it is not convenient for productization; 2. Since there is no feedback detection circuit for passive intermodulation cancellation results, the cancellation results cannot be monitored and adjusted in real time

[0007] In addition, other existing methods for reducing passive intermodulation signal levels mainly focus on the structure and production process of passive devices. These methods often require additional costs, and the electroplating process for thickening the metal coating often will increase pollution

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