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Fast multi-cell search method of CDMA20001X system

A multi-cell, cell technology, applied in access restriction, electrical components, wireless communication and other directions, can solve the problems of relying on the calculation of synchronization point performance, affecting the number of cells, time-consuming, etc., to improve processing speed and processing timeliness, realize complex effects

Active Publication Date: 2016-01-20
GUANGZHOU HUIRUI SITONG INFORMATION SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in a specific application, when multiple cells need to be searched, the operation steps mentioned above need to be repeated for each cell search.

Method used

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  • Fast multi-cell search method of CDMA20001X system
  • Fast multi-cell search method of CDMA20001X system
  • Fast multi-cell search method of CDMA20001X system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0030] Such as Figure 1-Figure 3 As shown, a method for quickly searching multiple cells in a CDMA2000 1X system includes the following steps:

[0031] S1 searches for the strongest pilot channel to determine the strongest cell at the current location, and obtains the pilot channel synchronization point of the current cell;

[0032] Specifically:

[0033] S1.1 Obtain air interface data and local PN sequence;

[0034] S1.2 Perform zero padding processing on the local PN sequence;

[0035] S1.3 Use the windowed FFT / IFFT algorithm for the air interface data and the zero-padded PN sequence to calculate the correlation value;

[0036] When the number of FFT points is equal to the code period, the following formula can be obtained by using the relationship between circular convolution and multiplication in the frequency domain:

[0037] R x y [ m ] = Σ ...

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Abstract

The invention discloses a fast multi-cell search method of a CDMA20001X system. The method comprises the following steps of: S1, searching a pilot channel to determine the strongest cell, and obtaining a pilot channel synchronization point of the current strongest cell; S2, obtaining air interface data in a manner of taking the pilot channel synchronization point as a start point, and performing synchronization operation to the current cell; S3, monitoring a paging channel for the current strongest cell, obtaining broadcasting information of the paging channel, and finishing search of the current strongest cell, wherein the broadcasting information of the paging channel comprises system message, access message and neighbor cell message; S4, obtaining pilot frequency bias of the neighbor cells according to the neighbor cell message, and determining a pilot channel synchronization point of the neighbor cells; S5, calculating energy of each of the neighbor cells, and then, sorting the cells according to energy magnitude of each cell to obtain a cell list; S6, orderly searching the cells in the cell list according to a descending order of energy.

Description

technical field [0001] The invention relates to the technical field of mobile communication, in particular to a method for quickly searching multiple cells in a CDMA2000 1X system. Background technique [0002] The CDMA20001x system uses the CDMA (Code Division Multiple Access, CDMA) spread spectrum technology, which uses the PN (pseudo-random) sequence to spread the useful narrowband signal to the bandwidth of 1.2288MHz for transmission. At the receiving end, use exactly the same The pseudo-random sequence and the data of the receiving antenna are correlated and restored to the original narrowband signal, that is, despreading. CDMA20001x system is one of the most representative third-generation mobile communication technologies because it uses code division multiple access spread spectrum technology, which has strong anti-interference ability, and has the characteristics of anti-multipath interference and anti-multipath delay. CDMA20001x is a synchronous system. To perform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W48/16
CPCH04W48/16
Inventor 李金龙邹敏
Owner GUANGZHOU HUIRUI SITONG INFORMATION SCI & TECH CO LTD