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Path index device of spectrum-spreading receiver

A receiver and path technology, applied in the direction of instruments, multiplex communication, communication between multiple stations, etc., can solve the problems of heavy hardware burden and large amount of calculation

Inactive Publication Date: 2002-07-03
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the correlation value has to be obtained from one chip after another, the amount of calculation is quite large and the burden on the hardware is quite heavy

Method used

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  • Path index device of spectrum-spreading receiver
  • Path index device of spectrum-spreading receiver
  • Path index device of spectrum-spreading receiver

Examples

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Embodiment Construction

[0020] With reference to Fig. 1, spread-spectrum receiver of the present invention is made of N antenna systems or diversity branches, and each diversity branch comprises antenna 1, is used for receiving the spread-spectrum signal propagated on the multipath attenuation channel, RF receiver or Down-converter 2 for down-converting the received signal, A / D converter 3 for converting the down-converted signal into digital form, and band-pass filter 4 for limiting the frequency of the digital signal to a predetermined bandwidth .

[0021] For the purpose of illustration, we assume that the spread spectrum receiver of the present invention is located at a base station of a mobile communication system. Each mobile station is assigned a specific encryption code that is multiplied by the channelization code to produce a spreading code. The information carrying the mobile station signal is encrypted using a spreading code and sent to the base station on the previous channel. The sync...

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Abstract

A path searcher of a spread spectrum includes a number of correlators each of which produces a replica of a scrambled synchronization code and determines a correlation value between the replica and a received spread spectrum signal. Each of the correlators performs a correlation operation between the received spread spectrum signal and the replica at a rate higher than a chip rate of the spread spectrum signal by successively shifting the replica with respect to the spread spectrum signal.

Description

technical field [0001] The present invention relates to spread spectrum (CDMA) communication systems, and in particular to a path retriever for use in a spread spectrum communication receiver for use in Delay characteristics of multiple communication paths of a diversity demodulator such as a RAKE demodulator are detected. Background technique [0002] Diversity combining in a spread spectrum system is a well-known technique, and the gain of a received signal is obtained by combining component signals of different communication paths. This is obtained through knowledge of individual path delays. To determine the delay of an individual path, an encrypted synchronization code is sent as timing information. At the receiving site, the synchronization code is detected by the correlation between the received signal and the encrypted replica of the synchronization code. The relative values ​​of individual communication paths represent their delay characteristics. Since the corr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707G01S19/30H04B1/709H04B7/26H04W56/00
CPCH04B1/7095H04B1/7075G01S19/30H04B1/7115H04B1/711
Inventor 矢崎孝弘
Owner NEC CORP