A frequency scanning method and device for a small-bandwidth communication system

A communication system and frequency scanning technology, applied in wireless communication, access restrictions, electrical components, etc., can solve problems such as affecting search efficiency, and achieve the effect of improving efficiency and shortening sampling waiting time.
CN108811044BActive Publication Date: 2021-01-26SANECHIPS TECH CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
SANECHIPS TECH CO LTD
Publication Date
2021-01-26

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Abstract

The invention discloses a frequency sweeping method and device for a small bandwidth communication system. A to-be-swept band is divided into a plurality of subbands according to system performance; frequency points in each subband are determined according to the minimum bandwidth of a system; FFT operation, slide accumulation operation and grid deviation accumulation operation are carried out ontime domain signals according to fixed gain; and after power distribution of all frequency points on the to-be-swept band are obtained, whether to adjust gain values to recalculate the power of each frequency point is decided according to a threshold demand. All frequency points of which power satisfying the threshold demand are screened according to the method, namely, all resident frequency points are obtained. According to the method and the device, the collected time domain signals are processed according to the fixed gain; the AGC (Automatic Gain Compensative) convergence time does not need to be reserved; and the integrated data processing time is greatly reduced. According to the method and the device, the frequency point distribution in each subband is determined according to the minimum bandwidth of the system and the power of each real frequency point is directly calculated in an bandwidth mode, so the sweeping omission condition resulting from the fact that calculated central frequency points are not the real frequency points is avoided.
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Description

technical field

[0001] The invention relates to the field of wireless communication, in particular to a frequency scanning method and a device thereof for a small-bandwidth communication system. Background technique

[0002] After the current mobile communication terminal is turned on, if there are historical frequency points stored in the terminal, it will usually try to camp on the historical frequency points first. If the camping attempt fails, or the terminal itself does not store historical frequency points, it needs to perform frequency scanning in all possible frequency bands to find a frequency point that can access the network. Scanning of frequency points is also unavoidable when the mobile terminal needs to re-detect and select a PLMN.

[0003] In the traditional frequency scanning method, a rough scan is first performed on all possible frequency points in a given frequency band by performing correlation calculation on the synchronous signal. During rough scanni...

Claims

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