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Correlator for carrying out low current consumption

A correlator and phase technology, applied in the field of correlators, can solve problems such as current consumption and long processing time

Inactive Publication Date: 2007-02-07
LENOVO INNOVATIONS LTD HONG KONG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the first prior art, a large amount of current is consumed
In the second prior art, a long processing time is required

Method used

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  • Correlator for carrying out low current consumption
  • Correlator for carrying out low current consumption
  • Correlator for carrying out low current consumption

Examples

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Embodiment Construction

[0058] Some preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

[0059] In the following embodiments, the present invention is applied to a mobile station in a CDMA mobile communication system.

[0060] Figure 5 is a block diagram showing a schematic structure of a CDMA mobile communication system to which a CDMA transmission device according to the present invention is applied.

[0061] ATM (Asynchronous Transfer Mode) communication technology and similar technologies have been adopted in consideration of diversification of services provided by mobile communication systems (multimedia trend) and efficient use of transmission paths connecting base stations, base station control devices, and switching stations (statistical multiplexing). It is applied to base stations, base station control devices and switching stations constituting the network side of the mobile communication system.

[0062] A mobile station 1...

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Abstract

A correlator can stop correlation computation on the basis of the value of a despreading code, and decreases the operation ratio of a section operated in accordance with a despreading code pattern to 1 / 2 that of a conventional scheme (when spreading is performed by BPSK). This correlator reduces the current consumption to about 1 / 2 that of the conventional scheme (when spreading is performed by BPSK) in a case of a sufficiently high spreading ratio by using a common total adder regardless of the despreading code pattern, thereby realizing lower current consumption than the conventional correlator without decreasing the operation speed.

Description

technical field [0001] The present invention relates to a correlator, in particular to a correlator for synchronous acquisition and low current consumption. Background technique [0002] In recent years, a mobile communication system has been gradually spread, such as a system using a portable telephone. One communication scheme used by such mobile communication systems is CDMA (Code Division Multiple Access). [0003] According to CDMA, on the transmitting side, data is spread using a predetermined spreading code that differs depending on the data to be transmitted, and the spread data is transmitted. On the receiving side, the received data is spread (commonly called despreading) using a spreading code identical to that used by the transmitting side (more precisely, a code that is complex conjugated to the transmitting side's spreading code) to get data. [0004] In communications using this CDMA technique, it is important to establish synchronization between a terminal...

Claims

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Application Information

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IPC IPC(8): H04J7/00H04L27/22H04B1/707H04B1/709H04L7/00
CPCH04B1/70752H04B1/709H04B2201/70707H04B2201/70706
Inventor 津村聪一
Owner LENOVO INNOVATIONS LTD HONG KONG
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