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Short burst carrier frequency offset estimation method

A carrier frequency offset, short burst technology, applied in the field of communications, can solve the problems of low carrier frequency tracking performance and reduced accuracy

Inactive Publication Date: 2015-11-11
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, when receiving short burst signals, there are few unique words used for frequency offset estimation, and the accuracy of traditional data-assisted frequency offset estimation algorithms is reduced, resulting in poor carrier frequency tracking performance

Method used

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  • Short burst carrier frequency offset estimation method
  • Short burst carrier frequency offset estimation method
  • Short burst carrier frequency offset estimation method

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Embodiment Construction

[0034] Below in conjunction with accompanying drawing, the present invention will be further described:

[0035] Frequency offset estimation is an important part of the carrier frequency tracking loop. The performance of frequency offset estimation directly affects the frequency tracking accuracy. When receiving short burst signals, there are few unique words that can be used for frequency offset estimation. The accuracy of the data-assisted frequency offset estimation algorithm is reduced, resulting in poor carrier frequency tracking performance.

[0036] The present invention takes a method for frequency offset estimation in satellite mobile communication as an example to describe in detail, and the carrier tracking loop at the receiving end is as follows: figure 1 Shown:

[0037] At the receiving end, the sampled burst signal is used as the input signal, and the frequency offset estimation is performed on the received signal, assuming that the timing synchronization has be...

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Abstract

The invention claims a short burst carrier frequency offset estimation method, relates to the field of communications and in particular relates to a short burst carrier frequency offset estimation method unique words in a mobile communication system. When a received signal is a short burst signal in the frequency tracking process of a communication receiving end, a short burst frequency offset estimation method comprises the following specific process: firstly, demodulating and decoding the received short burst signal to obtain signal bit information; secondly, re-coding and re-modulating the signal bit information to obtain an estimated received signal; and finally, extracting partial data symbols from the estimated received signal as unique words, and performing carrier frequency offset estimation of the unique words and the unique word information of the received signal, respectively, to obtain a final frequency offset estimated value, and then compensating the frequency of receiving signals by use of a carrier tracking loop. The short burst carrier frequency offset estimation method is capable of reducing the length of the obtained information bits and also improving the frequency estimation accuracy.

Description

technical field [0001] The invention belongs to the field of communication, in particular to a method for estimating carrier frequency offset in short bursts with less unique words in a mobile communication system. Background technique [0002] In mobile communication, especially in satellite mobile communication systems, after the receiver completes the initial synchronization, there is still a residual frequency offset, and due to the relative movement of the two parties in communication, the frequency will drift. Only fast and effective estimation and tracking of the frequency offset , the frequency compensation can be performed in time, so that the frequency offset of the received burst signal is within the normal receiving range of the receiver, and the receiving end can perform correct demodulation. Therefore, realizing fast and accurate estimation and tracking of the frequency offset of the received signal at the receiving end is the key to realizing the carrier synch...

Claims

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Application Information

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IPC IPC(8): H04L7/00
Inventor 李云吴春航吴广富曹傧
Owner CHONGQING UNIV OF POSTS & TELECOMM
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