Method and apparatus for cancellation eliminating common-frequency cell signal interference based on serial interference

Abstract

The invention provides a serial interference offset-based same-frequency cell signal interference eliminating method and device, for each cell, superposing the reconstructed signal of the cell in the previous-stage interference eliminating course and the residual signal obtained after removing all cell interfering signals in the current-stage interference eliminating course, and restoring the received signal of the cell; then reconstructing cell interfering signal by the demodulation symbol generated, based on combined detection; removing the reconstructed signal of the cell in the current-stage interference eliminating course from the input signal and obtaining the residual signal; according to serial progression, repeating executing the above steps. And the invention can eliminate the influence of same-frequncy cell signals and improve the signal receving performance of the cell on the mal-condition that the powers of the adjacent same-frequency cells are higher than that of the cell.

Description

technical field [0001] The present invention relates to a method and device for serially eliminating co-channel interference in a Time Division Synchronous Code-Division Multiple Access (TD-SCDMA) mobile communication system, specifically, a method and device for eliminating co-channel interference with a maximum The invention provides a method and a device for limiting the influence of co-channel interference signals on useful signals and improving the receiving performance of receivers. Background technique [0002] In the Direct Spread Code Division Multiple Access (DS-CDMA for short) system, due to the use of CDMA technology, objectively there is the possibility that different cells adopt the same frequency network, which means that a certain base station (NodeB) may be affected by Interference of mobile station (UE) signals in multiple same-frequency adjacent cells, or a certain mobile station may be interfered by signals of multiple same-frequency cell base stations. ...

AI Technical Summary

Problems solved by technology

When co-channel interference exists, since the spreading code (Spreading Code) and scrambling code (Scrambling Code) used in the TD-SCDMA system are relatively short in length (both are only 16 chips), the difference between the spreading code and scrambling code of different cells The cross-correlation characteristics between them are not ideal, and the traditional Rake receiver or the joint detection device (JD for short) of a single cell cannot effectively suppress the influence of the interference signal of the adjacent cell, resulting in the deterioration of the receiving performance of the TD-SCDMA system

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