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Novel Blind Recognition Algorithm of Frame Synchronization Words Based on Soft-Decision in Digital Communication Systems.

Qin J, Huang Z, Liu C, Su S, Zhou J - PLoS ONE (2015)

Bottom Line: Meanwhile, the improved algorithm can be extended to other signal modulation forms.Finally, the simulation results show that both the hard-decision algorithm and the soft-decision algorithm can recognize the parameters of frame synchronization words blindly.What's more, the improved algorithm can enhance the accuracy of blind recognition obviously.

View Article: PubMed Central - PubMed

Affiliation: College of Mechatronic Engineering and Automation, National University of Defense Technology, Changsha 410073, Hunan Province, P.R. China.

ABSTRACT
A novel blind recognition algorithm of frame synchronization words is proposed to recognize the frame synchronization words parameters in digital communication systems. In this paper, a blind recognition method of frame synchronization words based on the hard-decision is deduced in detail. And the standards of parameter recognition are given. Comparing with the blind recognition based on the hard-decision, utilizing the soft-decision can improve the accuracy of blind recognition. Therefore, combining with the characteristics of Quadrature Phase Shift Keying (QPSK) signal, an improved blind recognition algorithm based on the soft-decision is proposed. Meanwhile, the improved algorithm can be extended to other signal modulation forms. Then, the complete blind recognition steps of the hard-decision algorithm and the soft-decision algorithm are given in detail. Finally, the simulation results show that both the hard-decision algorithm and the soft-decision algorithm can recognize the parameters of frame synchronization words blindly. What's more, the improved algorithm can enhance the accuracy of blind recognition obviously.

No MeSH data available.


(A) The constellation diagrams at the transmitter (B) The constellation diagrams at the receiver.
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pone.0132114.g003: (A) The constellation diagrams at the transmitter (B) The constellation diagrams at the receiver.

Mentions: In section 2, a basic frame synchronization words blind recognition method is proposed. The method is based on the hard-decision. In this section, an improved blind recognition algorithm based on the soft-decision will be proposed. QPSK signal will be used to describe the improved algorithm. Suppose the QPSK signal transmitted through the Additive White Gaussian Noise (AWGN) channel and the transmitted signal is random. The QPSK signal constellation diagrams on the transmitter and the receiver are shown in Fig 3. There are four types of transmission signals on the transmitter. They are s1 = 1 + i, s2 = −1 + i, s3 = −1 − i and s4 = 1 − i. The transmission signals in AWGN channel have been distorted. Therefore, these signals cannot be used directly on the receiver. The constellation diagrams on the transmitter and receiver are shown in Fig 3.


Novel Blind Recognition Algorithm of Frame Synchronization Words Based on Soft-Decision in Digital Communication Systems.

Qin J, Huang Z, Liu C, Su S, Zhou J - PLoS ONE (2015)

(A) The constellation diagrams at the transmitter (B) The constellation diagrams at the receiver.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4496042&req=5

pone.0132114.g003: (A) The constellation diagrams at the transmitter (B) The constellation diagrams at the receiver.
Mentions: In section 2, a basic frame synchronization words blind recognition method is proposed. The method is based on the hard-decision. In this section, an improved blind recognition algorithm based on the soft-decision will be proposed. QPSK signal will be used to describe the improved algorithm. Suppose the QPSK signal transmitted through the Additive White Gaussian Noise (AWGN) channel and the transmitted signal is random. The QPSK signal constellation diagrams on the transmitter and the receiver are shown in Fig 3. There are four types of transmission signals on the transmitter. They are s1 = 1 + i, s2 = −1 + i, s3 = −1 − i and s4 = 1 − i. The transmission signals in AWGN channel have been distorted. Therefore, these signals cannot be used directly on the receiver. The constellation diagrams on the transmitter and receiver are shown in Fig 3.

Bottom Line: Meanwhile, the improved algorithm can be extended to other signal modulation forms.Finally, the simulation results show that both the hard-decision algorithm and the soft-decision algorithm can recognize the parameters of frame synchronization words blindly.What's more, the improved algorithm can enhance the accuracy of blind recognition obviously.

View Article: PubMed Central - PubMed

Affiliation: College of Mechatronic Engineering and Automation, National University of Defense Technology, Changsha 410073, Hunan Province, P.R. China.

ABSTRACT
A novel blind recognition algorithm of frame synchronization words is proposed to recognize the frame synchronization words parameters in digital communication systems. In this paper, a blind recognition method of frame synchronization words based on the hard-decision is deduced in detail. And the standards of parameter recognition are given. Comparing with the blind recognition based on the hard-decision, utilizing the soft-decision can improve the accuracy of blind recognition. Therefore, combining with the characteristics of Quadrature Phase Shift Keying (QPSK) signal, an improved blind recognition algorithm based on the soft-decision is proposed. Meanwhile, the improved algorithm can be extended to other signal modulation forms. Then, the complete blind recognition steps of the hard-decision algorithm and the soft-decision algorithm are given in detail. Finally, the simulation results show that both the hard-decision algorithm and the soft-decision algorithm can recognize the parameters of frame synchronization words blindly. What's more, the improved algorithm can enhance the accuracy of blind recognition obviously.

No MeSH data available.