Long distance cofrequency interference source detection and positioning method for TD-LTE system

Abstract

The invention relates to a long distance cofrequency interference source detection and positioning method for a TD-LTE system. According to the detection method, a main synchronization signal of detected interference signals is compared with a main synchronization signal of local district signals in time domains, if time difference surpasses the threshold, the interference signals are a long distance cofrequency interference source; according to the positioning method, physical-level district ID parameters contained in the a secondary synchronization signal and in the main synchronization signal in the interference signals are utilized to acquire the signal district ID, and a position of the interference district is determined according to a signal district ID configuration table. Compared with the prior art, the method has advantages of high accuracy and high operation efficiency.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a method applicable to a TD-LTE system for detecting and locating long-distance same-frequency interference sources. Background technique [0002] In order to provide large-capacity communication on limited frequency resources, the cellular communication system adopts frequency reuse technology, that is, the same communication frequency can be used simultaneously by multiple cells geographically far enough away. However, with the rapid increase of traffic in modern cellular communication systems, frequency reuse becomes more and more intensive, and the distance between cells using the same frequency (called "same-frequency cells") is shortened, and co-frequency interference is inevitable. [0003] In particular, in a TDD system, under the premise of maintaining strict time synchronization between different base stations, adjacent same-frequency cells will generate ...

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Problems solved by technology

[0005] For the first method, after the electromagnetic wave is transmitted beyond the line of sight and over a long distance, the positioning is usually inaccurate and cannot adapt to changes in factors such as terrain and weather

[0006] The second method is the relatively accurate traditional on-the-spot road test method. It needs to use a sports car to gradually approach the interference source along the direction of the strongest interference signal. The entire process must be assisted by maintenance personnel, especially in long-distance Positioning is more time-consuming and labor-intensive, with great blindness

[0014] Among the above methods, the first, second, and fourth methods are all based on the power of the received interference signal to judge whether there is long-distance co-channel interference. When affected by random noise, the accuracy of this method will decrease

However, method 3 needs to obtain relevant information of base stations that may exert interference in a wide range, and the overhead is relatively large, and the operating efficiency is relatively low.

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