Results 181 to 190 of about 39,121 (219)
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The Journal of the Acoustical Society of America, 2014
Sound source localization with sensor arrays involves the estimation of the direction-of-arrival (DOA) from a limited number of observations. Compressive sensing (CS) solves such underdetermined problems achieving sparsity, thus improved resolution, and can be solved efficiently with convex optimization.
Angeliki, Xenaki +2 more
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Sound source localization with sensor arrays involves the estimation of the direction-of-arrival (DOA) from a limited number of observations. Compressive sensing (CS) solves such underdetermined problems achieving sparsity, thus improved resolution, and can be solved efficiently with convex optimization.
Angeliki, Xenaki +2 more
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IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2017
Acoustically hard objects, such as bones, needles, or catheters, are poorly visualized in conventional ultrasound images. These objects behave like acoustic mirrors and reflect sound in specific directions. Soft tissue and diffusive reflectors scatter sound in a broad range of directions.
Alfonso Rodriguez-Molares +3 more
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Acoustically hard objects, such as bones, needles, or catheters, are poorly visualized in conventional ultrasound images. These objects behave like acoustic mirrors and reflect sound in specific directions. Soft tissue and diffusive reflectors scatter sound in a broad range of directions.
Alfonso Rodriguez-Molares +3 more
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Beamforming Matrix Transformation for Random Beamforming
2011 IEEE 73rd Vehicular Technology Conference (VTC Spring), 2011The signal to interference plus noise ratio (SINR) feedback has been utilized in random beamforming (RBF) to select users for the provision of service in multiple-input multiple-output (MIMO) systems. A large number of users are required to obtain the gain of multi-user diversity for a downlink transmission.
Jongrok Park, Hojae Lee, Sanghoon Lee
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A tunable beamformer for robust superdirective beamforming
2016 IEEE International Workshop on Acoustic Signal Enhancement (IWAENC), 2016Conventional superdirective beamforming is a well-known multi-microphone enhancement method with superior directivity factor (DF). However, it suffers from an inferior white noise gain (WNG), which is expressed by high sensitivity to uncorrelated noise and array inaccuracies.
Reuven Berkun +2 more
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Smooth Beamforming and Efficient Beamforming Weight Computation
IEEE GLOBECOM 2007-2007 IEEE Global Telecommunications Conference, 2007This paper investigates an efficient way of computing the beamforming weights for a MIMO OFDM system. It is shown that computing the weights incrementally across correlated channels can significantly reduce the complexity. An additional benefit of this technique is that it provides a "smooth" beamformer, i.e., it does not significantly change the ...
Magnus Sandell, Vishakan Ponnampalam
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Journal of Medical Ultrasonics, 2017
A number of studies aimed at improvement of ultrasound image quality, such as spatial resolution and contrast, have been conducted. Apodization is known as an important factor that determines image quality. However, in the case of amplitude and phase estimation (APES) beamforming, a kind of adaptive beamformer that has been employed in medical ...
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A number of studies aimed at improvement of ultrasound image quality, such as spatial resolution and contrast, have been conducted. Apodization is known as an important factor that determines image quality. However, in the case of amplitude and phase estimation (APES) beamforming, a kind of adaptive beamformer that has been employed in medical ...
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Adaptive Beamforming Assisted ReceiverAdaptive Beamforming
2009Adaptive beamforming is capable of separating user signals transmitted on the same carrier frequency, and thus provides a practical means of supporting multiusers in a space-division multiple-access scenario. Moreover, for the sake of further improving the achievable bandwidth efficiency, high-throughput quadrature amplitude modulation (QAM) schemes ...
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Sensor array beamforming using random channel sampling: The aggregate beamformer
The Journal of the Acoustical Society of America, 2003The aggregate (AGG) beamformer can provide significant savings in hardware and software cost and complexity relative to conventional beamformers while retaining equivalent directional performance. The key to achieving the savings is collecting data from array channels in a random sequence, rather than simultaneously or sequentially. This allows the AGG
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Transfer Beamforming via Beamforming for Transfer
IEEE Transactions on Mobile Computing, 2023Xueyuan Yang +3 more
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