Frequency scanning method for time division-synchronization code division multiple access (TD-SCDMA) system

A technology of TD-SCDMA and frequency scanning, applied in the transmission system, access restrictions, electrical components, etc., can solve the problems of deviation, data deviation, failure to be popularized and applied, etc., to achieve the effect of solving interference and reducing overhead

Inactive Publication Date: 2010-11-24
MEDIATEK INC
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Problems solved by technology

[0003] However, in the actual system, there may be other users on the auxiliary carrier frequency, which brings inevitable deviation to the method of determining the correct main carrier frequency only by relying on power information
Therefore, there are deviations in the data obtained by using the existing frequency scanning method, which cannot be popularized and applied.

Method used

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  • Frequency scanning method for time division-synchronization code division multiple access (TD-SCDMA) system
  • Frequency scanning method for time division-synchronization code division multiple access (TD-SCDMA) system
  • Frequency scanning method for time division-synchronization code division multiple access (TD-SCDMA) system

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Embodiment Construction

[0022] The invention provides a method for frequency scanning in a TD-SCDMA system, such as Figure 1~4 Shown, including the following process -

[0023] First, determine the frequency sweep step size, automatic gain control (AGC) reference power and initial gain. Specifically, the reference power of its automatic gain control is obtained according to the input dynamic range of the A / D to ensure that the A / D input control is appropriate. Moreover, the initial gain can be set to meet the dynamic range of -55dbm to -85dbm, so that the automatic gain will not be saturated or too weak, causing distortion of the characteristic window. At the same time, the initial gain is the signal strength most often received by the TD-SCDMA system terminal.

[0024] Subsequently, starting from any time, the subframe signal data is received on a certain carrier frequency with a certain gain value, and the initial gain is performed for the first time. Specifically, the subframe signal is compos...

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Abstract

The invention relates to a frequency scanning method for a time division-synchronization code division multiple access (TD-SCDMA) system, which belongs to the technical field of telecommunication. The method is characterized by comprising the following steps of: firstly, determining a frequency scanning step length and the reference power and initial gain of automatic gain control; secondly, starting the initial gain from any moment; thirdly, forming a characteristic window, and determining the position of a downlink pilot time slot; fourthly, judging whether the position is switched to a next frequency point according to the step length; and finally, acquiring a main carrier frequency and a main carrier wave according to the power value of the recorded downlink pilot time slot. The main carrier frequency is determined rapidly in a sliding window way, so that hardware storage cost is reduced, and the disturbance of an auxiliary carrier wave on a frequency scanning result is solved well. In the method, the automatic gain control is combined with dynamic adjustment of reference power, so that the distortion of the characteristic window is prevented, and the main carrier wave is determined accurately.

Description

technical field [0001] The invention relates to a method for frequency scanning, in particular to a method for frequency scanning in a TD-SCDMA system, and belongs to the technical field of electrical communication. Background technique [0002] The purpose of frequency scanning is to find the main carrier frequency with strong power and shorten the initial cell search time. In the TD-SCDMA system, the time slot 0 (TS0) and the downlink pilot time slot (DwPTS) of the upper frame structure of the main carrier frequency carry the main common control physical channel (PCCPCH) and the downlink synchronization code, which provides frequency scanning possible. [0003] However, in an actual system, there may be other users on the auxiliary carrier frequency, which brings inevitable deviation to the method of determining the correct main carrier frequency solely by power information. Therefore, there are deviations in the data obtained by adopting the existing frequency scanning ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707H04W48/16
Inventor 方明叶远胡劲忠夏海龙吴子熙
Owner MEDIATEK INC
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