Title：A bit synchronization algorithm and device applied to 2FSK signal
Country：China
Patent No.：201510955302.9
Legal Status：Authorized
Inventor：Chun Zhang, Heyi Hu, Qiyong Tang, Zhenning Li
Assignee：Tsinghua University
Address：Mailbox No. 82, Beijing 100084
Filing Date：2015-12-17
Issue Date：2019-02-05
Abstract：
The invention discloses a bit synchronization method and device for a 2FSK signal. The method comprises the following steps: S1, designing a phase locked loop to track two separate frequency components of the 2FSK signal; S2, respectively obtaining an I (t) signal and a Q (t) signal according to the 2FSK signal and the two separate frequency components; S3, respectively carrying out error extraction on the I (t) signal and the Q (t) signal based on a Gardner bit synchronization algorithm to obtain a synchronization error; and S4, respectively generating interpolation positions of the I (t) signal and the Q (t) signal according to the synchronization error, and carrying out bit synchronization on the 2FSK signal according to the interpolation positions. Therefore, by adopting the bit synchronization method and device for the 2FSK signal provided by the embodiments of the invention, the obtained bit synchronization information is more accurate, so that the bit synchronization signal obtained by the Gardner bit synchronization algorithm is more accurate, and then a lower error rate can be obtained than common coherent demodulation under the same signal-to-noise ratio.
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