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Primary synchronous detection system for honeycomb searching of division code multiple task assess system

A technology of synchronous detection and code division multiple access, which is applied in the direction of code division multiplexing system, synchronization device, transmission system, etc.

Inactive Publication Date: 2005-12-28
ACCTON TECHNOLOGY CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as the frequency offset continues to increase, the compensation of the frequency offset cannot be avoided

Method used

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  • Primary synchronous detection system for honeycomb searching of division code multiple task assess system
  • Primary synchronous detection system for honeycomb searching of division code multiple task assess system
  • Primary synchronous detection system for honeycomb searching of division code multiple task assess system

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Embodiment Construction

[0046] The frequency offset causes two effects in the baseband, (1) phase rotation (phase rotation) and (2) sampling frequency offset (clock offset). The part of the sampling frequency offset has not been considered in the prior art.

[0047] image 3 A structure diagram of a primary synchronous detection device according to a first embodiment of the present invention is shown, and the primary synchronous detection device uses a fully compensated structure. The primary synchronous detection device 300 compensates (1) phase offset (phaserotation) (2) sampling frequency offset (clock offset) at the same time, which includes a compensation unit 310, a first switching interface 320, and multiple secondary detection units 331 , 332 , a second switching interface 340 and a selection unit 350 .

[0048] Because the primary synchronization detection device 300 of the present invention is used for cell search in a CDMA system, it is especially used in the first stage of cell search w...

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Abstract

This invention discloses a primary synchronous detection device including a compensation unit used in its entered signal-phase offset compensation and sample frequency offset compensation, a first exchange interface connected to the said compensation unit with several exchange ports for outputting the entered signal to several secondary detection units, several secondary detection units connecting the said exchange interface for detecting a primary synchronous code of the said entered signal, a second exchange interface connected to the said several secondary detection units with several exchange ports outputting the said entered signal, and a selection unit connected to the second exchange interface.

Description

field of invention [0001] The present invention relates to a primary synchronization detection device for cell search in a code division multiple access (CDMA) system, more particularly to a device for wideband code division multiple access (wideband code division multiple access, A primary synchronous detection device for cell search in a W-CDMA system. The detector adopts a fully-compensated or partially-compensated structure, which can effectively reduce the adverse impact of frequency offset effects on cell search. Background technique [0002] CDMA cellular systems (cellular systems) using a direct sequence spread spectrum code division multiple access technique greatly increase channel capacity. This system has attracted considerable attention in recent research on mobile communication systems. Generally speaking, due to the nature of frequency reuse, the bandwidth efficiency of CDMA systems is better than that of other multitasking access systems (such as frequency d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/7083H04B7/216H04W48/16H04W56/00
Inventor 何建兴沈文和
Owner ACCTON TECHNOLOGY CORPORATION
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