Synchronization frame structure and synchronization method suitable for short burst communication time-frequency joint synchronization

Abstract

The invention belongs to the field of wireless communication and military communication, and discloses a synchronization frame structure and a synchronization method suitable for short burst communication time-frequency joint synchronization. Coarse timing synchronization is completed by utilizing same short synchronization training sequences on a plurality of antennas, and the method comprises the following steps: performing shift correlation on a local short training sequence and a received signal, and finding a position where a maximum peak value is located as a coarse timing synchronization position; utilizing correlation between the cyclic prefix of the data part and the data tail part to correlate the CP length, taking the phase value of the correlation value at the coarse timing synchronization position to obtain a relative frequency offset value, and then carrying out frequency offset correction; and finally, carrying out shift correlation in a coarse timing synchronization (-CP, + CP) (CP refers to a cyclic prefix) range by using a local long training sequence and a received signal to obtain fine timing synchronization. Compared with the existing frame structure design, the synchronization frame structure and a synchronization method has the advantage that the timing synchronization accuracy is greatly improved.

Description

technical field [0001] The invention belongs to the field of wireless communication and military communication, and in particular relates to a synchronous frame structure and a synchronous method suitable for time-frequency joint synchronization of short burst communication. Background technique [0002] At present, the closest existing synchronization techniques mainly include data-assisted and non-data-assisted. For the data-assisted method, the training sequence or the cyclic prefix on the data is generally used for correlation, and the timing synchronization is found through the characteristics of the correlation value, and then the frequency offset estimation is determined. However, although the correlation is good in the current algorithm, the threshold is too large and cannot adapt to the communication environment with low signal-to-noise ratio. Some people also proposed to improve the frame structure design, insert the training sequence used for synchronization into...

AI Technical Summary

Problems solved by technology

[0004] At present, in short burst communication, timing synchronization and frequency offset estimation are mostly performed separately, and are rarely used in multi-antenna single-carrier systems. Most of them are researched on multi-carriers, and generally the algorithm complexity is high. Complicated hardware implementation

[0005] To sum up, the problems existing in the existing technology are: the time-frequency synchronization is performed separately, the algorithm complexity is high, the hardware implementation is inconvenient, the adaptability is poor in the low signal-to-noise ratio environment, and it is seriously affected by the channel environment

Due to the limited pilot data available in short burst communication, the accuracy of existing algorithms is limited, and most of them are researched on multi-carrier systems, and there is no experimental simulation under single-carrier frequency domain equalization system

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