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Honeycomb searching method under high sampling frequency deviation effect

A search method and cellular technology, applied in the field of cellular search, can solve problems such as signal level reduction and interference increase

Inactive Publication Date: 2003-12-03
ACCTON TECHNOLOGY CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

like Figure 4a and Figure 4b Shows the result of reduced signal level and increased inter-chip interference due to the effect of chip sampling frequency offset due to frequency offset

Method used

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  • 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

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Embodiment Construction

[0043] Figure 5 It is a schematic diagram of a cell search process according to an embodiment of the present invention, the method uses a multiple-dwell pipelined search method. like Figure 5 As shown, the meaning of the box here is different from the boxes in the second and third figures. exist Figure 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 cellular search processed in the block, the frame that it handles approximates figure 1 The frame structure shown. According to the present invention, a total of 512 scrambling codes 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 chip...

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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 firstbatch 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, more particularly 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 (the effect of clock offset) in the system. 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 (frequency reuse), the bandwidth efficiency (bandwidth efficiency) of the code division multitasking access system is compared with other multitasking access systems (such as frequency division multitasking access and time division multitasking...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J13/00
Inventor 何建兴沈文和
Owner ACCTON TECHNOLOGY CORPORATION
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