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Method and apparatus of initial cell search in time division synchronous CDMA system

A cell search and code division multiple access technology, which is applied in the field of initial cell search by user terminal equipment, can solve the problems of finding the location of DwPTS, performance constraints, difficulty, etc., and achieves low complexity, low correlation complexity, and high detection probability. Effect

Active Publication Date: 2008-01-16
XUANPU INDUSTRY CO LTD
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Problems solved by technology

The performance of this scheme largely depends on the effectiveness of its "characteristic window" method, but because only power information is used, the method based on the DwPTS envelope characteristics cannot be used under low SINR conditions. , especially when SINR<0dB, it is difficult to find the correct DwPTS position in a short time; , it is often required to adopt the method of segmented gain control (AGC) to adjust the input signal - in the case of this AGC function, whether the power envelope characteristics of the DwPTS part can still be preserved, or whether its characteristics are still obvious, remains to be seen. further research
To sum up, although this “feature window”-based scheme can effectively reduce the processing complexity of the first step of the initial cell search in the TD-SCDMA system, its performance in the actual working environment is restricted by many factors. Therefore, further practical tests are needed

Method used

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  • Method and apparatus of initial cell search in time division synchronous CDMA system
  • Method and apparatus of initial cell search in time division synchronous CDMA system
  • Method and apparatus of initial cell search in time division synchronous CDMA system

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Embodiment Construction

[0081] A preferred embodiment of the present invention will be described below with reference to FIGS. 4 to 13 .

[0082] As shown in FIG. 4 , it is a "1-bit" correlation method applied to the first step of the initial cell search in the TD-SCDMA system proposed by the present invention. The core idea of ​​this method is to only use the sign bit of the input data sample, that is, one bit for each I / Q path to process, instead of using multi-bit correlation processing as shown in Figure 3, which can make a series of corresponding processing units Greatly simplify and reduce software / hardware processing overhead and power consumption. The flow of the "1-bit" correlation method is described below in conjunction with FIG. 4 . First in step 40, according to the sampling input of the received data I / Q road, the sign bit extractor (50 as shown in Figure 5) extracts the sign bit {ai of the I / Q road data) respectively n , aq n}, where the subscript n is the input sample number, and a...

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Abstract

The invention is a method and device for initialization district search applied to time division synchronous code division multiple access (TD-SCDMA) mobile communication system. It includes relative method and device for the first step of (1 bit) for initialization district, and series and parallel iteration method for the first and the second steps including the initialization district, and it has low process complexity and excellent performance, and it can reduce the search time effective in bad transmission condition. The '1 bit' relative method and device includes extracting the path symbol, reverse rotation, bit exclusiveor, static '1' numbers and power calculation steps and models; the iteration method can compensate the performance loss caused by the '1 bit' relative method and device.

Description

technical field [0001] The present invention relates to a method applied to a wireless communication system, in particular to a method applied to a Time Division Synchronous Code-Division Multiple Access (TD-SCDMA) mobile communication system, in which user terminal equipment performs initial cell Search (InitialCell Search) method and device. Background technique [0002] In 1946, Bell Laboratories in the United States proposed to divide the service area of ​​mobile phones into several cells, and set up a base station in each cell to form a new concept of cellular (Cellular) mobile communication in a cellular system. In 1978, this system was successfully tested in Chicago, USA, and it was officially put into commercial use in 1983. The adoption of the cellular system enables the same frequency to be used repeatedly, thereby greatly increasing the capacity of the mobile communication system and meeting the objective needs of the sudden increase of mobile communication users...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04Q7/36H04J13/00H04W56/00
Inventor 谢一宁冉晓龙
Owner XUANPU INDUSTRY CO LTD
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