Rapid frequency offset estimation and compensation method and system based on burst communication
A technology for frequency offset estimation and burst communication, applied in the field of digital communication, can solve the problems of large amount of calculation, large Doppler frequency estimation error, low accuracy of estimated frequency offset, etc., so as to improve the accuracy and improve the frequency offset estimation. Accuracy, the effect of improving the signal-to-noise ratio
Pending Publication Date: 2022-03-11
中科南京移动通信与计算创新研究院
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The most basic estimation method based on the time domain is the maximum likelihood estimation algorithm. The estimation error of this algorithm can reach the lower limit of the Cramer-Labor boundary, and the performance is better, but the calculation is large and complex, and it is not suitable for high real-time requirements. system
However, the accuracy of frequency offset estimation based on the existing techniques in the frequency domain is not high, for example, the PMF-FFT algorithm combining segmented matched filter (PMF) and fast Fourier transform (FFT) is used
Due to the fence effect in the FFT transform, this method cannot accurately estimate the Doppler frequency shift, resulting in a large error in Doppler frequency estimation
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[0070] The technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some of the embodiments of the present disclosure, rather than all of them. Based on the embodiments of the present disclosure, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present disclosure. It should be noted that, in the case of no conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other. In addition, the role of the drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and visually understand each technical feature and overall technical solution of the present disclosure, but they should not be construed as limiting the protection sc...
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The invention discloses a fast frequency offset estimation and compensation method and system based on burst communication, and the method comprises the steps: obtaining a first signal, extracting a frame header signal of the first signal, demodulating the frame header signal, and obtaining a demodulated frame header signal; carrying out diversity combination on the demodulated frame header signal to obtain a frame header signal after diversity combination; performing coarse frequency offset estimation based on FFT on the frame header signal after diversity combining to obtain a coarse frequency offset estimation value, and performing coarse frequency offset compensation on the first signal according to the coarse frequency offset estimation value to obtain a second signal; extracting a pilot signal of the second signal, and demodulating the pilot signal to obtain a demodulated pilot signal; and carrying out FFT-based fine frequency offset estimation on the demodulated pilot signal to obtain a fine frequency offset estimation value, and carrying out fine frequency offset compensation on the second signal according to the fine frequency offset estimation value. According to the invention, the signal-to-noise ratio can be effectively improved, and the frequency offset estimation precision can be effectively improved.
Description
technical field [0001] The invention relates to the technical field of digital communication, in particular to a method and system for rapid frequency offset estimation and compensation based on burst communication. Background technique [0002] Burst communication is a special communication mechanism. The duration of the signal is short and the transmission interval is long. The communication system transmits a large amount of data in a short time, which can effectively reduce the probability of information being intercepted and interfered. Burst communication has a wide range of applications, including ground mobile cellular communication systems, satellite time-division multiplexing systems, and asymmetric digital subscriber lines. [0003] In the communication system, the inconsistency of the characteristics of the local oscillator at the transceiver end and the Doppler frequency shift caused by the relative motion of the transceiver and the transceiver will bring about ...
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IPC IPC(8): H04L27/00H04L27/26
CPCH04L27/0014H04L27/2659H04L27/266H04L2027/0026
Inventor 郭军平徐喜梅施渊籍石晶林
Owner 中科南京移动通信与计算创新研究院
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