A Cross Correlation Synchronization Algorithm Based on CAZAC Sequence
LI Xiaohui
MA Dandan
SHI Mingli
LYU Siting
Abstract：Aimed at the problems that timing synchronization algorithm is sensitive to frequency offset caused by multipath fading and Doppler spread in aviation communication,and is relatively poor in per-formance under condition of low signal-to-noise ratio,a synchronization algorithm is proposed by using constant envelope zero autocorrelation(CAZAC).A leading sequence with conjugate symmetry features is designed by using CAZAC sequences,and based on the structural features of the leading sequence,the cross-correlation is utilized for designing a timing metric function for accumulating peaks.The correlation value at the correct timing position is used to estimate the decimal frequency offset,and lastly,a pair of i-dentical CAZAC sequences is used to complete the second decimal frequency offset estimation.The simula-tion results show that when the correct detection probability reaches 100％,the performance of the im-proved algorithm improves by 3 dB.
Keywords：aviation communicationCAZAC sequencetiming synchronizationfrequency deviation estima-tion
Publication Date：2025-08-30
Online Publishing Date：2025-08-21(First online date of this platform, not the publication date of the document)
Pages：7( 82-88 )