Method and device for reducing intermodulation interference

Abstract

Embodiments of the present invention provide a method and device for reducing intermodulation interference. The method includes: performing real-time estimation according to the time domain information of M downlink transmission signals to obtain a first intermodulation interference signal; according to the first intermodulation interference signal Canceling the intermodulation interference generated by the M downlink transmission signals in the uplink received signal; wherein, M is an integer greater than or equal to 2, and the M downlink transmission signals are uncombined signals transmitted on M carriers baseband signal. Based on the above scheme, the first intermodulation interference obtained by real-time estimation using the time domain information of the M downlink transmitted signals is close to the actual intermodulation interference generated by the M downlink transmitted signals in the uplink received signal, so it can effectively offset the actual Intermodulation interference generated, thereby reducing intermodulation interference and improving system performance.

Description

technical field [0001] Embodiments of the present invention relate to the field of communication technologies, and more specifically, to a method and device for reducing intermodulation interference. Background technique [0002] In the wireless communication system, the wireless communication base station system is implemented by the baseband processing unit (Base Band Unit, BBU) to execute the baseband algorithm, which can communicate with the radio remote unit (Radio Remote Unit) through the common public radio interface (Common Public Radio Interface, CPRI) interface , RRU) exchange baseband signals, and then the RRU transmits the downlink transmission signal to the antenna through the feeder. [0003] However, due to non-ideal factors of some analog devices, such as cables, duplexers, or antenna feeders, intermodulation occurs between multiple downlink transmission signals, such as passive intermodulation (PIM). Under certain frequency point configurations, the frequen...

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Problems solved by technology

[0003] However, due to the non-ideal factors of some analog devices, such as cables, duplexers or antenna feeders, intermodulation will occur between multiple downlink transmission signals, such as Passive Inter-Modulation (PIM)

Under certain frequency point configurations, the frequency of intermodulation may be the same or close to the frequency of the useful signal, and the low-order intermodulation generated by the downlink transmission signal will hit the uplink reception frequency band, that is, the frequency of the generated intermodulation interference is the same as that of the uplink reception The frequencies overlap in whole or in part and, therefore, cause a kind of interference to the communication system

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