Method and device for parallel elimination of co-channel interference in time division synchronous code division multiple access system
A code division multiple access and time division synchronization technology, applied in transmission systems, radio transmission systems, communication between multiple stations, etc., can solve the degradation of TD-SCDMA system reception performance, inability to effectively suppress, and unsatisfactory cross-correlation characteristics And other issues
Active Publication Date: 2011-12-21
XUANPU INDUSTRY CO LTD
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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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[0343] The following combination Figure 2 ~ Figure 4 , the present invention is described in detail through optimized specific embodiments.
[0344] Taking the parallel interference cancellation of one time slot of TD-SCDMA as an example, it is assumed that the received signal of this time slot is Among them, r 1 ~ r 352 Represents the received signal of the data segment DATA1, Represents the received midamble sequence signal, r 353 ~ r 704 Represents the receive signal for data segment DATA2.
[0345] Such as image 3 As shown, it is a schematic structural diagram of the CEIGU based on the demodulation result of the matched filter provided by the present invention. The core of the CEIGU is to obtain the chip-level data on each active code channel of the cell from the demodulation result of the matched filter, and then pass the The excitation response convolution completes the reconstruction of the received signal of each code channel. The specific operation steps ar...
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The present invention provides a method and device for parallel elimination of co-channel interference in a time division synchronous code division multiple access system. For each cell, it reconstructs cell interference based on matched filters or demodulation symbols generated based on joint detection signal; then superimpose the reconstructed signals of other interfering cells; then remove the superposition value of the reconstructed signals of other interfering cells from the received signal, and eliminate the influence of the adjacent cell interfering signal on the received signal of this cell; and according to the parallel series, Repeat the above steps. The method and device provided by the present invention can, to a large extent, eliminate the influence of the same-frequency cell signal and improve the efficiency of the local cell, especially under the harsh condition that the power of the same-frequency adjacent cells is higher than that of the own cell with a small implementation complexity. Signal reception performance.
Description
technical field [0001] The present invention relates to a method and device for eliminating co-frequency interference in parallel in a Time Division Synchronous Code-Division Multiple Access (TD-SCDMA) mobile communication system, and specifically relates to a maximum A method and a device for limiting the parallel elimination of 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. Due to the different propagation delays o...
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IPC IPC(8): H04B7/26H04W16/24H04B1/10H04B7/212
Inventor 单鸣
Owner XUANPU INDUSTRY CO LTD