Device and method for self-adaptively cancelling passive intermodulation signals

Abstract

The invention discloses a device for self-adaptively cancelling a passive intermodulation signal, which is characterized in that one main path port of a coupler is connected with an antenna port of aduplexer, the other main path port of the coupler is connected with an antenna feeder assembly on an antenna link, and the coupling port of the coupler is electrically connected with a radio frequencyport of a canceller circuit; the input end of the passive intermodulation detection circuit is electrically connected with the duplexer receiving port, and the output end of the passive intermodulation detection circuit is electrically connected with the input end of a digital processing unit; the digital processing unit is electrically connected with the transmitting circuit unit through a transmitting signal frequency discrimination circuit. The output end of the digital processing unit is electrically connected with the input ends of the passive intermodulation detection circuit, the transmitting circuit unit and the canceller circuit, the output end of the transmitting circuit unit is electrically connected with the input end of the duplexer. According to the invention, the passive intermodulation signals generated by the wireless transceiver and other devices or components on the link from the antenna port of the device to the antenna can be counteracted, wherein the passive intermodulation signals fall into the receiving frequency band.

Description

technical field [0001] The invention relates to the field of wireless communication. Specifically, the present invention relates to a device and method 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...

AI Technical Summary

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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