Novel carrier extraction method for binary frequency shift keying signals

A carrier extraction and frequency shift keying technology, applied in modulation carrier systems, digital transmission systems, electrical components, etc., can solve the problem of increasing the signal-to-noise ratio threshold and bit error rate, reducing decoding performance, and discontinuous two-way carrier signals, etc. problem, to achieve the effect of high precision and continuous carrier error detection

Inactive Publication Date: 2013-12-18
DALIAN MARITIME UNIVERSITY +1
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AI Technical Summary

Problems solved by technology

At present, the main demodulation methods are divided into two categories: coherent demodulation and non-coherent demodulation; among them, the decoding performance of the coherent demodulation method is better. Under normal circumstances, coherent demodulation has a gain of 3dB compared with non-coherent demodulation. , but coherent demodulation needs to restore the coherent carrier. For 2FSK signals, since there are different carriers for different digital baseband codes (corresponding to and ), in the coherent demodulation method currently used for 2FSK signals, the square loop method is usually used for carrier extraction. The principle of this method is to obtain two different carrier frequency points through two filters respectively. The disadvantage of this method is : The two carrier signals obtained are discontinuous
Will increase the SNR threshold and bit error rate, thereby degrading decoding performance

Method used

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  • Novel carrier extraction method for binary frequency shift keying signals
  • Novel carrier extraction method for binary frequency shift keying signals
  • Novel carrier extraction method for binary frequency shift keying signals

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Experimental program
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Embodiment Construction

[0018] The 2FSK carrier extraction module of the present invention is a functional module in the 2FSK signal receiver, and needs to be matched with the back-end coherent demodulation module and the sampling decision module to jointly realize the demodulation output of the digital baseband signal of the 2FSK modulation signal. The specific composition structure is as follows image 3 shown.

[0019] Use a vector signal generator to generate a 2FSK modulation signal in which the digital baseband signal is 0 code and 1 code appearing alternately. The center frequency is set to 455KHz, and the frequency deviation is ±1.2KHz.

[0020] The 2FSK modulation signal used for the test is divided into two paths, one path is connected to the input of the carrier extraction module, and the other path is connected to the input terminal of the coherent demodulation module (12).

[0021] The bit synchronization signal output by the sampling decision module (13) is connected to the data interf...

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Abstract

The invention belongs to the communication technical field in the electronic information technical field, and relates to communication principles and signal processing subjects, in particular to a novel carrier extraction method for binary frequency shift keying (2FSK for short) signals. Input signals of a module comprise a 2FSK modulating signal which is received, and a bit synchronization signal. An output signal of the module is a continuous center carrier signal. The novel carrier extraction method has the advantages of being capable of realizing continuous carrier error detection, thereby obtaining coherent carriers with higher accuracy.

Description

technical field [0001] The invention belongs to the field of communication technology in the field of electronic information technology, relates to communication principles and signal processing subjects, and specifically relates to a new carrier extraction method for Binary Frequency Shift Keying (2FSK) signals. Background technique [0002] In a communication system, if the receiving end wants to recover the original digital baseband signal from the modulated high-frequency signal, it needs to demodulate the received signal. At present, the main demodulation methods are divided into two categories: coherent demodulation and non-coherent demodulation; among them, the decoding performance of the coherent demodulation method is better. Under normal circumstances, coherent demodulation has a gain of 3dB compared with non-coherent demodulation. , but coherent demodulation needs to restore the coherent carrier. For 2FSK signals, since there are different carriers for different d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/148
Inventor 张晶泊胡伟胡青
Owner DALIAN MARITIME UNIVERSITY
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