Method and apparatus for configuring scrambling
A configuration method and scrambling code technology, applied in the field of scrambling code configuration, can solve problems such as large maximum cross-correlation and limited composite code set, and achieve the effect of improving system performance
Inactive Publication Date: 2013-03-13
TD TECH COMM TECH LTD
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But generally speaking, for any spreading ratio, the complex code sets available to the system are limited, and the maximum cross-correlation between some complex code sets may be very large, which introduces the problem of complex code set configuration, that is The Problem of Configuring Composite Code Sets for Each Cell in CDMA System
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[0050] In order to make the purpose and technical solution of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples.
[0051] In the TD-SCDMA system, each scrambling code corresponds to a complex code set, and the complex codes in the set are obtained by multiplying each spreading code with the scrambling code chip by chip and rotating by a certain angle. For the generation method of the composite code, reference may be made to the corresponding 3GPP TS 25.223 standard, which will not be repeated here. For a certain spreading ratio, the complex code sets of different scrambling codes may be completely the same, so the scrambling codes corresponding to the same complex code set are grouped together to form a scrambling code group. It should be noted that, in the case of different spreading ratios, the grouping of scrambling codes is different. Since the composite code set and the ...
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The invention discloses a scrambling configuration method and a scrambling configuration device, which mainly comprise the following steps of: configurating a basic scrambling group is configurated for a wireless communication system according to the cross-correlation characteristics among the basic scrambling groups; and selecting a scrambling code for the cell from the basic scrambling group of each cell according to cross-correlation characteristics of the scrambling groups with high spread spectrum ratio corresponding to higher spread spectrum ratio. The method and the device converts the scrambling configuration into two processes of configuration of the basic scrambling groups and selection of the scrambling code, can fast and effectively realize scrambling configuration, fully consider the cross correlation among the scrambling groups of the configurated scrambling code under the condition of different spread spectrum ratio and basically ensure that stronger correlation does not exist among the scrambling codes used by the adjacent cells, thus achieving the aim of improving the performance of the system.
Description
technical field [0001] The invention relates to wireless communication technology, in particular to a method and device for scrambling code configuration in a Code Division Multiple Access (CDMA, Code Division Multiple Access) wireless communication system. Background technique [0002] In a wireless communication system, signals received by a base station or user equipment (UE, User Equipment) in a cell include signals from other cell UEs or base stations in addition to signals from the UE or base station in this cell. Inter-cell interference is introduced into the wireless communication system. If the spreading ratio (SF, Spread Factor) of the CDMA system is small, the composite spread code (CSC, composite spread code) used by the two cells may have a strong cross-correlation, resulting in the existence of the CDMA system. Strong inter-cell interference. Wherein, the composite code used by each cell of the CDMA system is a code word obtained by multiplying the scrambling...
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IPC IPC(8): H04B7/216H04B1/7097H04J13/10
Inventor 张坚强李克薛强
Owner TD TECH COMM TECH LTD