Method and device for serial eliminating same frequency interference in TDS-CDMA

Abstract

The method and device for eliminating same frequency interference in serial in TDS-CDMA system includes steps: for each cell, superposing reconstructed signal in this cell in procedure of interference elimination at previous stage and residual signal after eliminating previous interference signals of all cells in procedure for eliminating interference in this stage so as to recover received signal of cell; based on matched filter or demodulation symbol generated from united detection to reconstruct interference signal of cell; then, removing reconstructed signal of this cell from the input signal so as to obtain residual signal with interference being removed; executing the steps repeatedly based on number of serial stage. With lesser complexity, the method eliminates influence of signals from cells in same frequency to a large extent, especially, in malcondition that power of common frequency in adjacent cell is higher than this cell so as to raise performance for receiving signal.

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, to a maximum A method and a device for serially eliminating the influence of co-channel interference signals on useful signals and improving the receiving performance of a receiver. 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. Due to the different propagation delays of different signals and the exi...

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 of the TD-SCDMA system are not ideal, and the traditional Rake receiver or the single-cell joint detection device (Joint Detection, referred to as JD) cannot effectively suppress the influence of the interference signal of the adjacent cell, resulting in the degradation of the receiving performance of the TD-SCDMA system

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