| Electrical & Electronic Engineering |
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| A new coding scheme in coded ultrasound using staggering repetition interval |
| Cheng JIN, Si-ping CHEN, Zheng-di QIN |
| School of Biomedical Engineering and Instrument Science, Zhejiang University, Hangzhou 310027, China; School of Medicine, Shenzhen University, Shenzhen 518060, China; Nokia Corporation, Tampere 33100, Finland |
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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.
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Received: 03 November 2008
Published: 27 June 2009
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