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Method for searching sub zone, implementation equipment and mobile communication terminal

A technology for mobile communication terminal and cell search, applied in the field of cell search, implementation device and mobile communication terminal

Inactive Publication Date: 2004-10-27
上海明波通信技术股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The mobile communication terminal uses these 3 physical channels for cell search

Method used

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  • Method for searching sub zone, implementation equipment and mobile communication terminal
  • Method for searching sub zone, implementation equipment and mobile communication terminal
  • Method for searching sub zone, implementation equipment and mobile communication terminal

Examples

Experimental program
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Embodiment Construction

[0062] The first realization form:

[0063] Reference attached Figure 6 , the mobile communication terminal equipment described in the present invention, comprises antenna 81, the transmit / receive switching duplexer 82 that is connected with antenna 81, radio frequency receive processing module 83, radio frequency transmit processing module 84, local voltage controlled oscillator (VCXO ) 89, and processing modules such as the baseband signal processing module 85.

[0064] The function of the sending / receiving switching duplexer 82 is to separate the sending current signal flowing from the radio frequency sending processing module 84 to the antenna 81 and the receiving current signal flowing from the antenna 81 to the radio frequency receiving processing module 83, so as to prevent mixing of receiving and sending signals .

[0065] The radio frequency receiving processing module 83 is composed of a received signal carrier synthesizer, a mixer for converting the frequency of ...

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Abstract

Operation of partial correlation or total correlation is carried out between first sync code and receiving signal. Operation of difference detection is carried out for the result of correlation operation. Based on result of partial correlation operation or result of difference detection, determination of time slot synchronization of first step for sub zone searching is carried out in order to raise capability of anti initial frequency error in sub zone searching. Using the said result of difference detection estimates frequency deviation between carrier signal generated by local oscillator and carrier signal in received signal, and controls corresponding frequency in order to reduce frequency deviation. Based on estimated frequency deviation, Operations of correlation for second and third steps in zone searching are selected. Thus, false detection rate in the said second and third steps are reduced, and receptivity of broadcast channel is raised after zone searching.

Description

1. Technical field: [0001] The present invention relates to a kind of digital communication, and more specifically refers to a cell search method, an implementation device and a mobile communication terminal, which uses the first synchronization code to perform partial or full correlation calculations with received signals, and performs differential detection on the correlation calculation results, The time slot synchronization determination in the first step of cell search is performed based on partial correlation calculation results or differential detection results, so as to improve the ability to resist initial frequency errors in cell search. Based on the above differential detection results, estimate the frequency deviation between the carrier signal generated by the local oscillator and the carrier signal in the received signal, and perform corresponding frequency control to reduce the frequency deviation, and select the second step and the second step of cell search acc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707H04B7/26H04L27/26
Inventor 陈小元
Owner 上海明波通信技术股份有限公司
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