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We have specified a new system for a compact digital delay-and-sum beamformer using delta-sigma A/D converters. The new design allows for dynamic (time variant) delays to be introduced prior to delta-sigma demodulation without disrupting modulator-demodulator synchronization, as applying delays in this order is important to achieve a compact implementation. Our new method is based on a description...
Within the field of wireless communications, it has been known for a while that "echoes" in the channels can be used constructively to improve communication success factors, and not only as a destructive feature as in the case of inter-symbol interference. This is particularly true for so called MIMO (multiple input multiple output) systems. In this paper, we propose to use echoes constructively...
Sparse arrays have been proposed for two-dimensional arrays for three-dimensional ultrasound imaging in order to reduce the number of channels in the system. Such arrays have been designed by picking array elements in a random fashion, either according to a uniform or a Gaussian distribution. A random array can have large variations in the level of the maximum sidelobe. A method for optimization of...
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