Method and device for frame synchronization of interphone communication

Abstract

The invention discloses a method and a device for frame synchronization of interphone communication. The method comprises the steps of carrying out correlation operation for a to-be-measured sequence extracted in a received signal and a preset normalized synchronous sequence to obtain a correlation value; calculating a normalization factor by utilizing an element with the absolute value thereof in the to-be-measured sequence satisfying a set range, wherein the set range is greater than 2; carrying out normalization processing for the correlation value by utilizing the normalization factor to obtain a normalization value; and if the normalization value is greater than a set threshold value, determining that the to-be-measured sequence is a synchronous sequence. The invention also discloses a device for frame synchronization of interphone communication, which adopts the method abovementioned. With adoption of the method and the device for frame synchronization of interphone communication, false detection of frame synchronization caused by noise in an interphone communication process can be avoided, the false detection probability is reduced efficiently, the reliability of frame synchronization is improved, and the communication quality of an interphone is further improved.

Description

technical field [0001] The present invention is a divisional application of an invention patent application with the application number 201110418742.2 and the application date on December 14, 2011, entitled "A Method and Device for Frame Synchronization in a Frequency Modulation Communication System", which relates to the field of wireless communication, especially A frame synchronization method and device in a frequency modulation communication system. Background technique [0002] Digital Private Mobile Radio (Digital; Private; Mobile; Radio, DPMR) and Digital Mobile Radio (Digital; Mobile; Radio, DMR) are dedicated wireless communication technical specifications formulated by the European Telecommunications Standards Institute, and are widely used digital walkie-talkie standards. Using quaternary frequency shift keying modulation technology. [0003] When two walkie-talkies communicate, they receive and send signals alternately. Only by determining the correct synchroniz...

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Problems solved by technology

[0013] In the FM communication system, after the signal is discriminated, the amplitude of the noise will be much larger than that of the normal signal, and the change will be more drastic. Due to the short length of the synchronization sequence and the pseudo-randomness of the noise, it is likely to appear out of synch For the noise sequence with similar sequence, the correlation operation between the noise sequence and the preset synchronous sequence will obtain a larger correlation value. Small, eventually making the normalization value larger, exceeding the set threshold, resulting in false detection

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