Method and apparatus for capturing frequency correction channel as well as method and apparatus for estimating frequency deviation
A technology for frequency correction channel and frequency offset estimation. It is applied to multi-frequency code systems, baseband system components, etc., and can solve problems such as low clock accuracy, frequency offset estimation and compensation, and performance degradation.
Inactive Publication Date: 2012-01-25
ZTE CORP
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[0007] The method based on sliding correlation will be less affected by noise, but the clock accuracy of the mobile station or other related equipment is usually not high, and its performance will deteriorate sharply when the local clock deviation is greater than 1kHz, and this method cannot perform frequency offset estimation and compensation
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[0065] The frequency correction channel acquisition method of the present invention is as figure 2 shown, including:
[0066] Step 21, save L (L greater than the repetition period of FCCH) consecutive time slot (burst) data on the search frequency point;
[0067] Step 22, starting from the first data of the stored L continuous burst data, take out N data (N is the length of FCCH) at a time, perform a rotation correlation operation to obtain the maximum correlation peak of this operation, until the end up to one data;
[0068] Step 23, obtaining the first correlation peak with the maximum value among all the maximum correlation peaks obtained by the rotation correlation calculation, and recording the peak value and position information of the first correlation peak;
[0069] Step 24, when the peak value of the first correlation peak exceeds the capture threshold, capture the frequency correction channel according to the position information of the first correlation peak.
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The invention provides a method and a device for capturing a frequency correction channel, as well as a method and a device for estimating frequency deviation, wherein, the method for capturing the frequency correction channel comprises the following steps: step A1, storing outburst data on searching frequency points; step A2, starting from the first data of the stored outburst data, taking out aplurality of data every time to carry out a rotation correlation algorithm, so as to obtain the maximal correlated peaks of the algorithm till to last data, wherein, the N is the length of the frequency correction channel; step A3, obtaining a first correlated peak with a maximal value in all the maximal correlated peaks obtained by the rotation correlation algorithm, and recording the peak valueand the position information of the first correlated peak; step A4, capturing the frequency correction channel according to the position information of the first correlated peak when the peak value of the first correlated peak exceeds capturing threshold . By utilizing the method, FCCH can be quickly captured under the conditions of lower signal-to-noise ratio, and more precise estimation of the frequency deviation is obtained, so as to adjust a local clock.
Description
technical field [0001] The invention relates to synchronization technology in the field of mobile communication, in particular to a frequency correction channel acquisition method and device, and a frequency offset estimation method and device. Background technique [0002] GSM is the most widely used communication standard in mobile communication. There are several traffic channels and control channels in the GSM protocol. Among them, the traffic channel is used for digital voice service or data service transmission, and the control channel includes well-known frequency Correction channel (Frequency Correction Channel, FCCH). FCCH can synchronize the local clock frequency of the mobile station to the precise frequency on the base station. [0003] Such as figure 1 As shown, the FCCH has a unique data burst packet format, that is, GMSK (Gaussian-filtered Minimum Shift Keying Gaussian-filtered Minimum Shift Keying) modulation is performed on 142 fixed sequences. The transm...
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IPC IPC(8): H04L27/26H04L25/02
Inventor 郭建林杨锋辛胜利
Owner ZTE CORP