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Interference-suppress method for time slot code division multiple access system

An interference suppression and time slot code technology, applied in transmission systems, electrical components, etc., can solve problems such as the problem of co-channel interference in cellular networks, improve stability and availability, reduce dropped calls, and avoid strong interference. Effect

Active Publication Date: 2007-02-28
SHANGHAI ULTIMATE POWER COMM TECH
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Problems solved by technology

[0006] The purpose of the present invention is to provide an interference suppression method for a time-slot code division multiple access system, so as to overcome the same-frequency interference problem existing in the cellular network even if the existing TD-SCDMA system adopts multi-cell joint detection technology. , reduce the phenomenon that the TD-SCDMA system is prone to call drop at the cell boundary and reduce the overall performance of the system when the TD-SCDMA system is in the same frequency network, and improve the stability and availability of the system

Method used

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  • Interference-suppress method for time slot code division multiple access system
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  • Interference-suppress method for time slot code division multiple access system

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Embodiment Construction

[0025]The core of the present invention is that when the multi-cell joint detection technology is applied in the time-slot code division multiple access system, if the joint detection of code channels exceeding the limited number cannot be performed to eliminate co-channel interference, firstly determine the code channels that need to be jointly detected Then compare whether the total number of code channels exceeds the joint detection processing capability of the receiver. If the total number of code channels that need joint detection exceeds the joint detection processing capability of the receiver, the system changes the user's channel coding rate or rate matching Various methods such as punching ratio, reducing the amount of data to be sent, and changing the modulation mode will control the total number of code channels that need joint detection within the range of joint detection processing capabilities.

[0026] In order to enable those skilled in the art to better unders...

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Abstract

The invention relates to a disturbance restrain method of time-slot code division multiple access system. Wherein, it comprises when the detected code channel is more than maximum code channel of receiver, the system changes the signal channel coding speed of user or the speed matching hole rate, reduces sent data, and changes modulation, to control the detected code channel under maximum code channel. The invention can reduce the drop communication rate of TD-SCDMA system at the region edge, to improve the system stability.

Description

technical field [0001] The invention relates to mobile communication technology, in particular to a method for suppressing interference based on joint detection and processing capability of a receiver in a time slot Code Division Multiple Access (CDMA) mobile communication system. Background technique [0002] In CDMA mobile communication systems, the main factors affecting system capacity and performance are Multiple Access Interference (MAI) and Inter-Symbol Interference (ISI). By using joint detection technology, the multi-user information of all received signals can be used to simultaneously detect the received Signal processing is performed on the received multi-user signals, so that the MAI and ISI can be reduced, the system capacity can be increased, and therefore the allocated spectrum resources can be used more effectively. The biggest problem encountered in the practical use of joint detection technology is that its computational complexity changes geometrically wi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707H04B1/7105
Inventor 李峰钟南
Owner SHANGHAI ULTIMATE POWER COMM TECH
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