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Honeycomb searching method under sampling frequency deviation effect and device

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

Inactive Publication Date: 2003-12-03
ACCTON TECHNOLOGY CORPORATION
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Problems solved by technology

like Figure 5a and Figure 5b Shows the result of reduced signal level and increased inter-chip interference under the effect of sampling frequency offset due to frequency offset
And when the frequency offset continues to increase, the cell search will not be possible without frequency offset estimation

Method used

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  • Honeycomb searching method under sampling frequency deviation effect and device
  • Honeycomb searching method under sampling frequency deviation effect and device
  • Honeycomb searching method under sampling frequency deviation effect and device

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Embodiment Construction

[0047] now please refer to Figure 6a , which is a schematic diagram of a cabinet sorting method according to an embodiment of the present invention. The incoming signal carrier frequency is f 0 , limited by the accuracy of the client crystal oscillator, there is an error between the carrier frequency of the incoming signal and the frequency of the client crystal oscillator, and the error range is distributed in f H and f L between; that is, based on the client, the carrier frequency of the incoming signal is between f H and f L between. This interval is referred to herein as the carrier uncertainty range. According to a cabinet sorting method proposed by the present invention, when the incoming signal enters the various stages of cellular search in the uncertain range of the carrier frequency for the user equipment, it is divided into a plurality of small areas (cells) in the uncertain range of the carrier frequency. ), there is a sub-carrier frequency in each area; whe...

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Abstract

A cellular search method for CDMA receiving system features that a bin mode is used in the first stage for lowering the effect of clock offset by roughly estimating frequency and a three-stage processing method is used, where the first stage is for processing time slot synchronization, the second stage is for processing code group and frame synchronization, and the third stage is for processing disturb code synchronization. The said method includes such steps for each stage as dividing the uncertain range of carrier frequency for an incoming signal into multiple cells called as a bin, and using the frequency of a sub-carrier in each cell as the reference frequency for processing the incoming signal.

Description

technical field [0001] The present invention relates to a cell search method for a code division multiple access (CDMA) system, in particular to a cell search method using three-stage processing, in which a cabinet-based approach is used in the first stage (multiple-bin method) The effect of the sampling frequency offset (the effect of clock offset) in the system is reduced by a method of roughly estimating the frequency. 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 divi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707H04B7/26H04W48/18
Inventor 何建兴
Owner ACCTON TECHNOLOGY CORPORATION
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