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Method and apparatus for realizing down synchronization in first search of area

A cell and synchronization code technology, applied in the communication between multiple stations, advanced technology, climate sustainability, etc., can solve the problem of poor anti-interference ability, reduce the receiving sensitivity of downlink pilot time slots, and reduce the accuracy of search synchronization the probability of

Active Publication Date: 2007-11-21
DATANG MOBILE COMM EQUIP CO LTD
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AI Technical Summary

Problems solved by technology

[0009] In the prior art, the characteristic window method can only reflect the characteristic window characteristics of the signal power when the signal-to-noise ratio is greater than 0db. Probability of correct search synchronization
Compared with the characteristic window method, the receiving sensitivity of the direct correlation method is improved, but when there is a strong uplink signal, the anti-interference ability is poor, which may be caused by misjudgment due to the high correlation peak value after the correlation operation

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  • Method and apparatus for realizing down synchronization in first search of area
  • Method and apparatus for realizing down synchronization in first search of area
  • Method and apparatus for realizing down synchronization in first search of area

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Embodiment Construction

[0072] The method and device of the present invention can quickly and accurately realize downlink synchronization, and can solve the limitation of the signal-to-noise ratio on the initial search of the cell when the characteristic window method is used and the correlation operation caused by the interference of the strong interference signal on the received signal when the direct correlation method is used. Misjudgment.

[0073] Referring to Fig. 2, the method for realizing downlink synchronization in the initial cell search of the present invention includes:

[0074] In step S201, the terminal receives a wireless signal and converts it into initial data.

[0075] Step S202, the terminal obtains the power of each initial data, slides at predetermined data intervals, obtains the average power of the received data of the synchronization code length on the power value sequence, and obtains each average amplitude value through each average power value.

[0076] In step S203, the ...

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Abstract

The method comprises: the terminal gets the initial data, and uses the predetermined data-interval sliding to get the average power value and amplitude of each length-predetermined data sequence. Wherein, the terminal makes the sliding multiple correlation calculation for the initial data and the downlink synchronous code to get a correlation matrix, and after mean amplitude normalization, gets its correlation power matrix; searching the maximum power value more than the system threshold from the correlation matrix, and determines the downlink synchronous code and its location in the received data. The apparatus thereof comprises: a data receiving unit, a power calculation unit, an amplitude calculation unit, a sliding multiple correlation calculation unit, a normalization unit and a power comparison unit.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a method and device for realizing downlink synchronization in initial cell search. Background technique [0002] In a Time Division Duplex (TDD, Time Division Duplex) communication system, the uplink and downlink channels between the network side and the mobile terminal occupy the same frequency band, support uplink and downlink asymmetric service transmission, and have great flexibility in spectrum utilization. [0003] After the mobile terminal is turned on in the wireless network system, the first step for the terminal to access the system is to conduct an initial cell search. The purpose of cell initial search is to select a suitable working frequency point, and obtain downlink synchronization with the current cell at this frequency point, so that the terminal device can quickly access the cellular network, monitor the broadcast channel, receive cell in...

Claims

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Application Information

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IPC IPC(8): H04B7/26H04L27/26
CPCY02D30/70
Inventor 韩波于洋
Owner DATANG MOBILE COMM EQUIP CO LTD
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