Method for detecting interference source outside cell in TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) system

A TD-SCDMA and interference source technology, applied in the field of interference location, can solve the problem of location of interference sources outside the cell that does not yet exist in the TD-SCDMA system

Inactive Publication Date: 2011-03-23
TD TECH COMM TECH LTD
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Problems solved by technology

[0003] At present, the existing interference source location methods all involve radar, sonar and other systems, and there is no method for interference source location for TD-SCDMA system out-of-cell interference

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  • Method for detecting interference source outside cell in TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) system
  • Method for detecting interference source outside cell in TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) system
  • Method for detecting interference source outside cell in TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) system

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Embodiment Construction

[0025] In order to make the purpose, technical means and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0026] In the TD-SCDMA system, data is transmitted in units of frames. Due to the particularity of the frame structure, the TD-SCDMA system suffers from interference outside the cell, which is different from the interference detected by other interference source location methods at present. At the same time, the timing and method for detecting interference sources are also different. In the specific TD-SCDMA system, a subframe includes 3 special time slots and 7 business time slots, each time slot includes 864 chips, one part of which is used to transmit Midamble for channel estimation, etc., and the other part is used to transmit actual Data information; in a subframe, some time slots are uplink time slots, and the base station receives user signals in the cell in ...

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Abstract

The invention discloses a method for detecting an interference source of a TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) system, comprising the following steps of: when no user exist in a target cell, receiving the receiving signals of all chips outside the target cell on preset upstream time slots in preset subframes in a detection carrier frequency by utilizing each receiving antenna of a base station for the target cell, and calculating the average power of the received receiving signals of all chips; determining whether the interference source exists or not according to the average power, if so, determining a covariance matrix in an interference signal space of each preset subframe and a covariance matrix in interference signal average space of all preset subframes; determining the space power spectrum of the interference signals by utilizing the covariance matrix of the average space and the preset direction vector, wherein a direction corresponding to a peak value in the space power spectrum is the direction of the interference source, and the peak value is an interference power. The method can be applied to positioning the interference source on account of the interference outside the cell of the TD-SCDMA system.

Description

technical field [0001] The invention relates to an interference location technology, in particular to an interference source detection method for a TD-SCDMA system. Background technique [0002] TD-SCDMA is a CDMA system in which signals of all users overlap in time and frequency, and different users are distinguished through the orthogonality between spreading codes. For users in the same cell, joint detection (JD) can be used to eliminate the interference between users in the cell. The interference outside the cell (including interference from other cells in the TD-SCDMA system, interference from other communication systems such as WCDMA, or interference from other radiation sources, etc.) has become the main interference. When the intensity is high, it will have a great impact on system performance, and even cause the system to fail to communicate normally. Therefore, in order to ensure system performance, it is necessary to estimate the external interference situation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W24/00H04B17/00
Inventor 张翼鹏
Owner TD TECH COMM TECH LTD
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