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CLC number: TH77

On-line Access: 2009-06-27

Received: 2008-11-03

Revision Accepted: 2009-04-02

Crosschecked: 2009-06-10

Cited: 2

Clicked: 4844

Citations:  Bibtex RefMan EndNote GB/T7714

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Journal of Zhejiang University SCIENCE A 2009 Vol.10 No.8 P.1213-1216

http://doi.org/10.1631/jzus.A0820762


A new coding scheme in coded ultrasound using staggering repetition interval


Author(s):  Cheng JIN, Si-ping CHEN, Zheng-di QIN

Affiliation(s):  School of Biomedical Engineering and Instrument Science, Zhejiang University, Hangzhou 310027, China; more

Corresponding email(s):   chensiping@szu.edu.cn

Key Words:  Coded ultrasound, Frame rate, Cross-correlation (CC), Staggering, Ultrasonic imaging


Cheng JIN, Si-ping CHEN, Zheng-di QIN. A new coding scheme in coded ultrasound using staggering repetition interval[J]. Journal of Zhejiang University Science A, 2009, 10(8): 1213-1216.

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Abstract: 
The increase of frame rate, though with the potential in a coded ultrasound system, is generally concomitant with the simultaneous transmission of a number of apertures, and in consequence leads to increased cross-talks between different apertures. In view of this, a new coding scheme using staggering repetition interval was proposed. The transmitting signals were constructed by repeating the two (or more) modulated codes using staggering repetition interval, and then allocated to and transmitted simultaneously among different apertures. The decoding process was based on the subsection-matched filter under the assistance of different matched filters for different apertures. At last the outputs of subsection-matched filtering were added together. staggering changed the positions of cross-correlation (CC) peaks from coinciding, which resulted in an effective reduction of CC. Our theoretical analysis and simulations showed that, the coding scheme can be used to reduce cross-talk, and a good cross-talk reduction will be achieved if the staggering delay is kept in an appropriate range.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

Reference

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[6] Qin, Z.D., Turunen, S., 2004. Nearly Orthogonal Codes in GNSS Using Unequal Code Lengths. Proc. ION 60th Annual Meeting, p.666-670.

[7] Qin, Z.D., Turunen, S., 2005. Multiple Access Using Different Codes Lengths For Global Navigation Satellite Systems. US Patent 0 129 096.

[8] Takeuchi, Y., 1979. An investigation of a spread energy method for medical ultrasound systems—Part one: theory and investigation. Ultrasonics, 17(4):175-182.

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