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Implementation method, device, terminal and storage medium of carrier frequency offset estimation
Active Publication Date: 2021-02-05
南京中科晶上通信技术有限公司
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Since the performance of non-data-aided algorithms is easy to deteriorate under low SNR conditions, data-assisted algorithms are generally used in related technologies to estimate the frequency offset of signals, but data-assisted algorithms in related algorithm technologies are for Single-frame data is used for frequency offset estimation, so under the condition of low signal-to-noise ratio, there is a problem of low accuracy of frequency offset estimation
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Embodiment 1
[0030] The embodiment of the present application provides a method for realizing carrier frequency offset estimation, such as figure 1 As shown, the method includes:
[0031] Step S101 , based on the input data after frame synchronization processing, determine a plurality of consecutive frame headers.
[0032] In the embodiment of the present application, the data after the frame synchronization processing is the data with the determined frame start position, and multiple frame headers are determined through multiple frame start positions. In a specific application, multiple frame start positions can be obtained through the data enable signal, thereby determining multiple consecutive frame headers. After the input data is received, it is generally buffered through the FIFO buffer module, and the purpose of the buffer is to perform subsequent frequency offset compensation.
[0033] In the embodiment of this application, the data frame includes three parts: frame header, data ...
Embodiment 2
[0060] In order to further illustrate the implementation method of carrier frequency offset estimation provided by the embodiment of the present application, the following is as follows image 3 The FPGA module is shown as an example for further explanation.
[0061] After the FPGA module receives the input data, it uses the FIFO module to cache the input data, and the multiplier 1 reads the FIFO and ROM modules to combine the frame header read from the FIFO module with the local frame read from the ROM The header information sequence is conjugated and multiplied. The local header sequence stored in ROM consists of 90 known symbols (I local +Q local *j), complex conjugate multiplication can be converted to complex addition by:
[0062] (I recv +Q recv *j)·(I local +Q local *j) *
[0063] =(I recv *I Iocal +Q recv *Q local )+(-I recv *+Q local +Q recv *I local );
[0064] Among them, I local , Q local The value is ±1, so the result of conjugate multiplicatio...
Embodiment 3
[0070] The embodiment of the present application provides a device for realizing carrier frequency offset estimation, such as Figure 4 As shown, the device includes: a continuous frame header determination module 301 , a continuous frame header processing module 302 , an autocorrelation processing module 303 , a phase offset determination module 304 , an average phase offset determination module 305 and an air interface resource processing module 303 .
[0071] Wherein, the continuous frame header determining module 301 is configured to determine a plurality of consecutive frame headers based on the input data after frame synchronization processing;
[0072] The continuous frame header processing module 302 is used to perform conjugate multiplication operation on multiple frame headers and local pre-stored frame header sequences respectively to obtain multiple operation result sequences;
[0073] An autocorrelation processing module 303, configured to perform autocorrelation ...
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Abstract
The present application provides a method, device, terminal and storage medium for realizing carrier frequency offset estimation. The method includes: based on the input data after frame synchronization processing, determining a plurality of continuous frame headers; performing conjugate multiplication operations on the multiple frame headers and the local pre-stored frame header sequences to obtain multiple operation result sequences; Carry out autocorrelation calculations on the operation result sequence to determine the multiple autocorrelation values corresponding to the multiple frame headers; determine the corresponding phases of the multiple frame headers according to the multiple autocorrelation values corresponding to the multiple frame headers and the predetermined argument angle Offset; calculate the average phase offset; perform phase compensation on the data frames corresponding to the multiple frame headers according to the average phase offset corresponding to the multi-frame data. The embodiment of the present application comprehensively considers the average phase offset of multi-frame data to perform frequency offset estimation, and solves the problem of low accuracy of frequency offset estimation caused by relying on single-frame data for frequency offset estimation in the prior art.
Description
technical field [0001] The present application relates to the field of communication technologies, and in particular to a method, device, terminal and storage medium for realizing carrier frequency offset estimation. Background technique [0002] During the channel transmission of the signal, due to a certain relative motion speed between the satellite and the receiver, the Doppler effect will cause a certain degree of frequency offset in the received signal. Only after frequency offset correction can the signal be correctly resolved Tune. Therefore, it is very important to estimate and compensate the frequency offset of the received signal with high precision in wireless communication. In related technologies, frequency offset estimation algorithms are roughly divided into two categories: two categories without data assistance and with data assistance. Among them, typical non-data-assisted algorithms include M-power ring and Costas ring, and data-assisted algorithms gener...
Claims
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