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A same-frequency-interference detection method

A co-channel interference and detection method technology, applied in the field of mobile communication, can solve the problems of co-channel interference positioning, difficulty in obtaining accurate and reliable detection results, and no time division multiplexing system, so as to achieve the effect of accurate positioning

Inactive Publication Date: 2015-04-15
TD TECH COMM TECH LTD
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Problems solved by technology

[0004] Since the length of the SYNCDL code is only 64 chips, and the cross-correlation of the SYNCDL code is not ideal, the detection ability of the passive detection method for detecting the SYNCDL code is severely limited
It is difficult to obtain accurate and reliable detection results when interference signals from multiple interference sources are superimposed on each other
Since the number of syncdl codes is only 32, if the detection area is too large, there will be multiple cells using the same syncdl code and main frequency point, so it is difficult to locate the specific interfering cell
[0005] A detection method that can accurately locate co-channel interference in a time-division multiplexing system has not yet been proposed

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Embodiment Construction

[0018] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0019] The core idea of ​​the present invention is: use the interference sampling data to calculate the interference signal strength curve, determine the type of interference and the interference suspected area where interference occurs. For long-distance co-channel interference, it is divided into several parts according to the interference intensity of the interference source from large to small, and these suspected parts are detected one by one from near to far. For the interference caused by GPS deviation of the base station, the suspected area of ​​interference is the vicinity of the interfered station. When detecting each suspect part, the length of the characteristic signal (specifically Zadoff-chu sequence) used for interference d...

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Abstract

The present application discloses a same-frequency-interference detection method, wherein, an OMC (Operation Management Center) sends an instruction for coordination and control to each of base stations, so that each of interfering suspected base stations sends a different Zadoff-chu sequence at a certain interfered frequency point at the same time in a downlink time slot from a TS0 time slot to a DwPTS time slot, while an interfered base station receives an interference signal in an uplink time slot; and the OMC executes normalized correlation detection on each of the sent Zadoff-chu sequences in receiving of the signal according to ideal cross-correlation and self-correlation of the Zadoff-chu sequences, finds the Zadoff-chu sequences of which normalized correlation values exceed a threshold, and locates the specific interfering base stations through a corresponding relationship of the Zadoff-chu sequence and the base station. Therefore, the same-frequency-interference detection method can locate the same-frequency-interference of a time division multiplexing system accurately.

Description

technical field [0001] The invention relates to mobile communication technology, in particular to a method for detecting co-channel interference of a time division multiplexing system. Background technique [0002] For time-division duplex systems (such as TD-SCDMA, Wimax, TD-LTE, etc.), the uplink and downlink use the same frequency, and the uplink and downlink conversion uses a guard interval for protection to avoid downlink interference between adjacent cells. However, due to the propagation characteristics of electromagnetic waves, in some scenarios (good air propagation environment, atmospheric waveguide effect, etc.), the downlink signal of a certain cell may propagate to very far places (tens of kilometers or even hundreds of kilometers). Maintain a relatively high strength. At this time, the signal delay exceeds the guard interval, causing interference to the uplink signal of the same-frequency carrier in the remote cell, resulting in an increase in the uplink noise ...

Claims

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Application Information

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IPC IPC(8): H04W24/00H04B17/345H04L25/03
CPCH04L25/03331H04W24/00
Inventor 江森徐绍君肖健佟学俭
Owner TD TECH COMM TECH LTD
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