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Search method in CDMA mobile communication receiving system and receiving device

A technology of mobile communication and search method, applied in the field of synchronous capture and search, which can solve the problem of not being able to know the position of the new path

Inactive Publication Date: 2003-02-26
NEC CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] cannot be received and has no way of knowing where a new path will appear

Method used

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  • Search method in CDMA mobile communication receiving system and receiving device
  • Search method in CDMA mobile communication receiving system and receiving device
  • Search method in CDMA mobile communication receiving system and receiving device

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Experimental program
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Embodiment Construction

[0038] Preferred embodiments of the present invention are described below with reference to the accompanying drawings.

[0039] In the present invention, the following two types of searchers are defined, and the following operating conditions are set for the corresponding searchers in order to realize the following functions:

[0040] ①Cell searcher: The search range is set to the entire radius of the target cell; the search resolution is very low, and the search takes a long time.

[0041] ②Delay extension searcher: The search range is a narrow range in which an effective multipath can be received; the search resolution is high, and the time required for the search is very short.

[0042] figure 1 The concept of a receiving device is shown, which is used to explain the search method according to the present invention. see figure 1 , the received signal 1 is sent to a plurality of searchers 3 to 12 via the switching unit 2 . One of the cell searchers 5, 10 and 12 and at ...

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Abstract

Two kinds of user-tailored searchers, narrow-search-range searchers (3, 4) and a wide-search-range searcher (5), are set out of a plurality of groups of searchers in compliance with the features of two kinds of multi-paths in mobile communication, and are used, thereby making it possible to search efficiently with high accuracy and on reduced hardware and software scales.

Description

technical field [0001] The present invention relates to a method and a receiving device for synchronous acquisition and search in a receiving scheme of a CDMA (Code Division Multiple Access) mobile communication system, in particular to a method of using a plurality of searchers that arbitrarily set the search range according to the state of the receiving path Synchronous capture search method and receiving device. Background technique [0002] Recently, considerable attention has been devoted to the cellular phone system of the CDMA scheme in which spreading processing of the carrier is performed by using a pseudo-random code as a spreading code, and the pattern or phase of the code sequence of the spreading signal is changed to allow multiple road access. [0003] In the cellular phone system of this CDMA scheme, it is necessary to determine the relative start position of the received spread signal at high speed. Once this initial synchronization is obtained, control nee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707H04B1/7117H04B7/26H04L7/00H04W48/16H04W56/00
CPCH04B1/70754H04B1/70758H04B1/7113H04B1/7115H04B1/7117H04B1/7083H04B1/7085
Inventor 早田利浩
Owner NEC CORP
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