Radio frequency band selecting repeater station resisting to self-excitation interference and method of reducing self-excitation interference

Abstract

The invention discloses a radio frequency band selecting repeater station resisting to self-excitation interference and a method of reducing the self-excitation interference. The radio frequency band selecting repeater station is provided with a field programmable gate array (FPGA) circuit. The FPGA circuit is provided with a band selecting filter, an interference signal estimator, and a gain adjustment module, wherein the band selecting filter receives and outputs initial signals containing original signals and self-excitation interference signals, the interference signal estimator is provided with a decorrelation module and a signal extraction module, the signal extraction module is connected with the decorrelation module and generates approaching signals at an output end of the signal extraction module, an input end of the gain adjustment module receives difference signals formed by subtracting the initial signals and the approaching signals, and the decorrelation module is connected with an output end of the gain adjustment module and removes relativity of output signals. Compared with the prior art, the radio frequency band selecting repeater station does not need high installation cost, can conduct self-excitation treatment on frequency spectrum time-varying global system for mobile communications (GSM) due to the fact that understanding relevant processing treatment is conducted, and has the function of being wide in application range.

Description

technical field [0001] The present invention relates to the field of radio frequency repeaters, more specifically to a radio frequency band selection repeater that resists self-excited interference and a method for reducing self-excited interference of radio frequency band selection repeaters, which can be applied to time-varying frequency spectrum selection With GSM on. Background technique [0002] By re-amplifying the received wireless signal, the repeater can improve the signal quality of the base station signal without coverage or weak coverage area, and finally effectively improve the voice call service and data transmission service; among them, the radio frequency repeater has low installation difficulty and Features of strong applicability. Generally speaking, a high-gain RF repeater can improve network quality more effectively, but since the signal amplified by the RF repeater is in the same frequency band as the received signal, if the gain is greater than the ant...

AI Technical Summary

Problems solved by technology

Generally speaking, a high-gain RF repeater can improve network quality more effectively, but since the signal amplified by the RF repeater is in the same frequency band as the received signal, if the gain is greater than the antenna isolation, it will constitute a self-excited Interference, causing the radio frequency repeater to fail to work normally, and seriously affecting the signal quality

[0003] In order to ensure good network communication quality, engineering applications require that the amplified signal reaching the receiving antenna end, that is, the self-excited interference signal y(t) is 15dB smaller than the original signal s(t). To meet the above requirements, traditional RF repeaters are usually Engineering applications are guaranteed by increasing the isolation between the receiving and transmitting antennas, resulting in expensive installation costs

In order to reduce the installation cost, and combined with the increasingly mature random signal processing technology, people have developed the use of the characteristics of the wireless signal itself to effectively separate s(t) and y(t), and then let the radio frequency repeater only amplify the original signal s( t), which can eliminate self-excitation and meet the requirements of engineering applications, but it is only suitable for frequency-selective GSM with constant spectrum, and cannot cope with band-selective GSM with time-varying spectrum

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