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A Practical and Efficient Frequency Offset Estimation Method in Satellite Communication System

A satellite communication system and frequency offset estimation technology, applied in the field of frequency offset estimation, can solve problems such as large resource consumption, and achieve the effects of reducing consumption, reducing order, and reducing impact

Active Publication Date: 2020-05-15
四川安迪科技实业有限公司
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AI Technical Summary

Problems solved by technology

It uses FFT frequency domain estimation, the accuracy is affected by the number of FFT transformation points when applied to frequency offset estimation, and the resource consumption is large, so it cannot be applied to solve the existing technical problems listed above

Method used

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  • A Practical and Efficient Frequency Offset Estimation Method in Satellite Communication System
  • A Practical and Efficient Frequency Offset Estimation Method in Satellite Communication System
  • A Practical and Efficient Frequency Offset Estimation Method in Satellite Communication System

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example

[0039] In this example, the frame header in the physical frame structure is divided into 128 symbols, the data segment is 768 symbols, uw is 32 symbols, and the entire physical frame has 15 data segments, containing a total of 12096 symbols, such as Image 6 Shown are a schematic diagram of a frame structure and a frame structure encoding according to an embodiment of the present invention.

[0040] First, after data synchronization, the corresponding frame header and pilot position in the received signal are extracted. Then, the first 32 known symbols of the frame header and the first 32 known symbols of the local frame header, the received signal pilot band and the locally stored pilot band are deconjugated.

[0041] Cumulative average, the cumulative length N is 4, the first 32 bits of the frame header and the 32-bit pilot band, each segment is cumulatively averaged, a total of 15 groups of symbols after the cumulative average of each group is 8 symbols.

[0042] Calculate the au...

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Abstract

The invention proposes a high-precision carrier frequency offset estimation method with less multiplier consumption for frequency estimation based on known symbols. The method comprises the followingsteps: grouping received signals aligned with the local, and performing demodulation operation after grouping, and performing accumulative average operation on the demodulated data, and finally sending to a frequency offset estimation algorithm. Since the accumulative average is performed on the symbols in the group, the precision of the frequency estimation is only decided by the total number ofthe known symbols participating the operation. The related processing is performed on the known symbol fields after firstly performing grouping, and the autocorrelation operation order can be effectively reduced when the same frequency offset estimation precision performance is reached, and the algorithm complexity is reduced. The influence on an autocorrelation result by the noise is reduced by using the autocorrelation result accumulation of the corresponding orders of multiple known symbols, the credibility of the autocorrelation result is increased, and the frequency offset estimation precision is improved.

Description

Technical field [0001] The invention relates to the field of signal processing in satellite communication technology, in particular to a practical and efficient frequency offset estimation method in a satellite communication system. Background technique [0002] In satellite communications, the signal is mainly affected by frequency offset, channel fading, noise, etc. during channel transmission. The frequency deviation is usually caused by a series of factors such as the frequency deviation of the crystal oscillator and the Doppler frequency shift caused by the relative movement of the transceiver. Therefore, the influence of the frequency deviation on the signal cannot be avoided in the communication system. The frequency offset has a greater impact on the performance of the receiver, making the frequency offset estimation very critical in the synchronization of the receiver. The introduction of frequency offset into the baseband signal will cause the phase of the baseband sig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S19/25
CPCG01S19/254G01S19/256
Inventor 董杨鑫王建军杨鹏举向彬彬
Owner 四川安迪科技实业有限公司
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