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Improved M-part timing synchronization and frequency offset method based on CAZAC sequence

A technology of timing synchronization and timing deviation, which is applied in the field of satellite communication to achieve precise and stable timing synchronization, accurate timing estimation, and improved symbol estimation and frequency offset meter performance

Active Publication Date: 2022-06-03
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004]Aiming at the above-mentioned deficiencies in the prior art, the present invention provides an improved M-part timing synchronization and frequency offset method based on CAZAC sequences, using specific training symbols The time domain structure, combined with the improved CAZAC sequence, solves the problem of downlink timing and frequency offset synchronization in the large dynamic environment of the satellite and the ground, and improves the ability to resist noise interference

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  • Improved M-part timing synchronization and frequency offset method based on CAZAC sequence
  • Improved M-part timing synchronization and frequency offset method based on CAZAC sequence
  • Improved M-part timing synchronization and frequency offset method based on CAZAC sequence

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Embodiment Construction

[0056] The specific embodiments of the present invention are described below to facilitate those skilled in the art to understand the present invention, but it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes Such changes are obvious within the spirit and scope of the present invention as defined and determined by the appended claims, and all inventions and creations utilizing the inventive concept are within the scope of protection.

[0057] like figure 1 As shown, an embodiment of the present invention provides an improved M-part timing synchronization and frequency offset method based on a CAZAC sequence, including the following steps:

[0058] S1. Group the CAZAC sequences, and construct a CAZAC preamble sequence that satisfies the conjugate anti-symmetry according to the grouped CAZAC preamble sequence, as a CAZAC training sequence;

[0059] Preferably, a...

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Abstract

The invention discloses an M-part timing synchronization and frequency offset method based on a CAZAC sequence, and the method comprises the steps: dividing the CAZAC sequence to obtain a CAZAC leader sequence meeting conjugate antisymmetry, obtaining a CAZAC training sequence, and obtaining a receiving signal according to the CAZAC training sequence; constructing each timing metric matrix by using a received signal and a CAZAC training sequence, and screening a symbol timing estimation value; performing weighted summation on the symbol timing estimation value to obtain a timing deviation estimation value; meanwhile, according to symbol timing estimation values and conjugate antisymmetry between adjacent symbols, an integer frequency offset estimation value and a decimal frequency offset estimation value are obtained, and finally timing synchronization and frequency offset estimation are conducted through the decimal frequency offset estimation value, the integer frequency offset estimation value and the symbol timing estimation value. According to the invention, by constructing the leader sequence and combining the combination characteristics of the sequence, accurate and stable timing synchronization can be realized, the problem of timing and frequency offset joint synchronization in a satellite-ground large dynamic environment is solved, the symbol estimation and frequency offset performance is improved, and the anti-noise interference capability is improved.

Description

technical field [0001] The invention relates to the technical field of satellite communications, in particular to an improved M-part timing synchronization and frequency offset method based on a CAZAC sequence. Background technique [0002] CAZAC sequence is the abbreviation of constant envelope zero autocorrelation sequence, which is widely used in the synchronization algorithm of OFDM system. For example, in the terrestrial cellular mobile communication system, LTE uses the ZC sequence in the CAZAC sequence as the primary synchronization sequence. CAZAC has the characteristics of constant envelope, ideal periodic autocorrelation, and good cross-correlation. Common CAZAC sequences include ZC sequence, Chirp-Like sequence, Colomb sequence and Frank sequence, etc.; [0003] The fourth-generation communication system mainly uses the ZC sequence as the main synchronization sequence, which has a good autocorrelation peak under the condition of low signal-to-noise ratio. However...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04L27/2659H04L27/266H04L27/2666H04L27/2678H04L27/2688H04L27/2695Y02D30/70
Inventor 邓旭朱立东师一迈
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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