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Carrier frequency offset estimation method applicable to burst waveforms

A carrier frequency offset and frequency offset estimation technology, which is applied to multi-frequency code systems, baseband system components and other directions, and can solve the problems of low estimation accuracy, determination of calculation parameters, and reduction of traditional methods.

Active Publication Date: 2013-04-03
NO 722 RES INST OF CHINA SHIPBUILDING IND
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Problems solved by technology

[0003] The purpose of the present invention is to overcome the above-mentioned deficiencies, provide a carrier frequency offset estimation method suitable for burst waveforms, and solve the problems of low estimation accuracy and inability to determine calculation parameters adaptively according to channel parameters in existing carrier frequency offset estimation methods It can improve the accuracy of frequency offset estimation and reduce the amount of calculation of traditional methods under the same accuracy conditions

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  • Carrier frequency offset estimation method applicable to burst waveforms
  • Carrier frequency offset estimation method applicable to burst waveforms
  • Carrier frequency offset estimation method applicable to burst waveforms

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Embodiment Construction

[0035] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0036] This embodiment provides a method for estimating carrier frequency offset applicable to burst waveforms, and its implementation process: In the present invention, both parties in communication need to estimate the frequency offset of a received signal according to a known information sequence (ie, a synchronization header sequence). Let the sync header length be n , the receive sync header sequence is , the local synchronization header sequence is ,in is a discrete time variable, is the imaginary unit, is the summation symbol, and the summation range is discrete sequence of is the phase information of the sync header sequence, is the phase shift of the signal, is the frequency offset of the signal, is the time interval between discrete samples of the sequence, It is a unit pulse function. In this method, the frequency offset of...

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Abstract

The invention belongs to the field of estimation of wireless channel parameters, particularly relating to a carrier frequency offset estimation method applicable to burst waveforms. Both communication parties are required to have known information sequences (synchronous head sequences), and then two steps of coarse frequency offset estimation and fine frequency offset estimation are carried out by means of the synchronous head sequences. According to the method, the number of iterations of the frequency offset estimation can be determined in a self-adaptive manner according to the length of signal synchronous heads, the duration of receiving signals, signal-to-noise ratios and the like; and the frequency offset estimation intervals are gradually narrowed by means of high correlation of the synchronous head sequences, and the precision of the frequency offset estimation is improved.

Description

technical field [0001] The invention belongs to the category of wireless channel parameter estimation, in particular to a carrier frequency offset estimation method suitable for burst waveforms. Background technique [0002] In a wireless communication system, due to the instability of the oscillators at both ends of the transceiver, there is a frequency deviation between the carrier of the received signal and the carrier of the transmitted signal, and the baseband signal obtained after coherent demodulation and down-conversion usually contains a carrier frequency deviation, and Factors such as the Doppler frequency shift in wireless channel transmission will produce frequency offsets on the information, resulting in the receiver being unable to correctly demodulate the source information. Therefore, it is necessary to estimate the frequency offset of the received signal to reduce its impact on the information. , thereby improving system performance. The existing frequency ...

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Application Information

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IPC IPC(8): H04L25/02H04L27/26
Inventor 游行远杨平李杨尚萍萍
Owner NO 722 RES INST OF CHINA SHIPBUILDING IND
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