Method and device for reducing intermodulation interference

Abstract

An embodiment of the invention provides a method and a device for reducing intermodulation interference. The method includes steps as follows: according to time domain information of M down-load transmitting signals, carring out a real-time estimation and obtaining a first intermodulation interference signal; according to the first intermodulation interference signal, conteracting the intermodulation interference generated by the M down-load transmitting signals in an up-load receiving signal, wherein M is a integer not less than 2. The M down-load transmitting signals are baseband signals which are transmitted on M carrier waves and are not being combined. According to said technical scheme, the first intermodulation interference, which is obtained by the real-time estimation and is based on time domain information of M down-load transmitting signals, approaches the actually intermodulation interference generated by M down-load transmitting signals in the up-load receiving signal; so that the actually generated intermodulation interference can be effecitively conteracted, and the intermodulation interference is reduced and the system performance is improved.

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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