A device and method for adaptively canceling passive intermodulation signals

Abstract

The invention discloses a device for adaptively canceling passive intermodulation signals. One main channel port of the coupler is connected to the antenna port of the duplexer, and the other main channel port is connected to the antenna feeder component on the antenna link. , the coupling port of the coupler is electrically connected to the radio frequency port of the canceller circuit; the input end of the passive intermodulation detection circuit is electrically connected to the receiving port of the duplexer, and the output end of the passive intermodulation detection circuit is connected to the digital processing unit The input terminal is electrically connected; the digital processing unit is electrically connected to the transmitting circuit unit through the transmission signal frequency discrimination circuit, and the output terminal of the digital processing unit is respectively electrically connected to the input terminals of the passive intermodulation detection circuit, the transmitting circuit unit and the canceller circuit; the transmitting The output end of the circuit unit is electrically connected with the input end of the duplexer. The invention can cancel the component of the passive intermodulation signal falling into the receiving frequency band generated by the wireless transceiver device and other devices 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 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 are mainly focused on structure and technology. These methods often require additional costs, and the electroplating process of thickening the metal coating often increases pollution.

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