High-precision Time-Frequency Synchronization Method in Broadband Wireless Communication System
A technology of broadband wireless communication and time-frequency synchronization, which is applied in the field of communication, can solve problems such as complex time-frequency synchronization, and achieve the effects of accurate time synchronization, low consumption of system resources, and low cost of technology implementation
Active Publication Date: 2016-01-13
西安电子科技大学工程技术研究院有限公司
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The invention can significantly reduce the amount of computation, improve the accuracy of time synchronization, and solve the problem of complex time-frequency synchronization in broadband wireless communication systems under the condition of multi-path mobile channels
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Embodiment Construction
[0054] Attached below figure 1 , to further describe the embodiments of the present invention.
[0055] Step 1, obtain pilot data.
[0056] The autocorrelation sequence generated by the signal processor at the sending end of the communication system is used as the pilot sequence. The autocorrelation series is generated according to the following formula:
[0057]
[0058] Among them, C i Represents the autocorrelation sequence point, i represents the position of the point in the sequence, π represents the circular ratio, e represents the natural constant, j represents the imaginary number, K represents the length of the autocorrelation sequence, and L represents any integer that is relatively prime to the length K of the autocorrelation sequence.
[0059]The end part of the pilot sequence is appended to the front end of the pilot sequence as a cyclic prefix to obtain the first pilot frame. The cyclic prefix is the part at the end of the pilot sequence. The length of t...
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The invention discloses a high-precision time-frequency synchronization method in a broadband wireless communication system, mainly aiming at overcoming the defects of larger resource consumption and insufficient time-frequency synchronization precision of the prior art. The method comprises the following steps of: (1) generating pilot frequency data; (2) generating load data; (3) forming and transmitting sending packets; (4) obtaining initial delay related data and secondary delay related data; (5) obtaining time synchronization data; (6) obtaining a time synchronization position; (7) obtaining decimals-times carrier frequency deviation estimation; and (8) correcting decimals-times carrier frequency deviation. According to the high-precision time-frequency synchronization method, the time synchronization is obtained by one multiplication and five addition, so that the high-precision time-frequency synchronization method has the advantages that the time is accurately synchronized, the system is low in resource consumption, and the technology is small in realization cost; and the decimals-times carrier frequency deviation estimation can be obtained by two addition, so that the high-precision time-frequency synchronization method has the advantage of being accurate in decimals-times carrier frequency deviation estimation.
Description
technical field [0001] The invention belongs to the technical field of communication, and further relates to orthogonal frequency division multiplexing and single-carrier frequency domain equalization broadband communication technology, and is a pilot-based precise time synchronization method. The invention is used to solve the time-frequency synchronization problem of the broadband wireless communication system under the high-speed motion channel environment. Background technique [0002] In a broadband wireless communication system, in order to communicate normally, the receiving end needs to perform time synchronization on the received signal, and the performance of time synchronization affects the overall performance of the system. Most of the existing technologies use the correlation between the received signal and the training sequence to obtain timing synchronization. Due to the existence of multipath effects, there are multiple correlation peaks. When judging synchro...
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IPC IPC(8): H04L27/26
Inventor 刘龙伟张海林张嘉宁
Owner 西安电子科技大学工程技术研究院有限公司