Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Honeycomb searching method under high sampling frequency deviation effect

A cell search and over-sampling technology, applied in the field of cell search, can solve problems such as increased interference and lower signal level

Inactive Publication Date: 2006-02-22
ACCTON TECHNOLOGY CORPORATION
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As shown in Figure 4a and Figure 4b, under the effect of the chip sampling frequency offset caused by the frequency offset, the signal level decreases and the inter-chip interference increases.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Honeycomb searching method under high sampling frequency deviation effect
  • Honeycomb searching method under high sampling frequency deviation effect
  • Honeycomb searching method under high sampling frequency deviation effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0044]FIG. 5 is a schematic diagram of a cell search process according to an embodiment of the present invention, which uses a multiple-dwell pipelined search method. As shown in FIG. 5 , the meaning of the boxes here is different from the boxes in the second and third figures. In Fig. 5, the number x in the box indicates the X stage. For example, in the first search trial, both blocks 511a and 511b represent the first stage of processing, block 512 represents the second stage of processing and block 513 represents the third stage of processing. According to the present invention, the three-stage work of the cell search is processed in the block, and the frames processed are similar to the frame structure shown in FIG. 1 . According to the present invention, the total number of scrambling codes in block 512 are used in different cells during downlink, and are reused in the whole system. The code is further subdivided into 64 groups of 8 codes each. Each frame is 38400 chips...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A cellular search method for CDMA receiving system features use of a three-stage search, and includes matching an incoming signal from base station, over-sampling it N times and outputting N sampled points, under-sampling it N times, and outputting the N sampled points through 3 processing stages. The first processing stage includes prechoosing the first batch of multiple candidates for the first batch of multiple time slots and final choosing. It can reduce the influence from frequency deviation at high chip speed for speeding up the cellular search.

Description

technical field [0001] The present invention relates to a cell search method for a code division multiple access (CDMA) system, and more particularly relates to a method for wideband code division multiple access (WCDMA) -CDMA) system cell search method, the method adopts multiple dwell strategy (multiple dwell scheme) can reduce the effect of high sampling frequency offset in the system (the effect of clock offset). Background technique [0002] CDMA cellular systems using a direct sequence spread spectrum code division multiple access (DSCDMA) technology 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 the CDMA system is superior to that of other multitasking access systems (such as frequency division multitasking access and time division multiple access). In addition, cell planning is quite simple in...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/216H04J13/02H04J13/00
Inventor 何建兴沈文和
Owner ACCTON TECHNOLOGY CORPORATION
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com