Results 261 to 269 of about 1,722,156 (269)
Some of the next articles are maybe not open access.
Hybrid adaptive/nonadaptive beamforming for ultrasound imaging
2013 IEEE International Conference on Acoustics, Speech and Signal Processing, 2013We propose and evaluate a simple yet effective technique of combining nonadaptive and adaptive beamforming methods aimed to achieve high quality of ultrasound images at low computational cost. Our hybrid beamformer automatically switches between nonadaptive and adaptive beamforming of input data vectors, based on the outcome of the comparison of the ...
M. Albulayli, D. Rakhmatov
openaire +1 more source
Hybrid phase-shift/time-delay digital beamforming
The Journal of the Acoustical Society of America, 1982Digital phase-shift beamforming of narrow-band signals from uniform colinear hydrophone arrays may be accomplished by computationally efficient algorithms which exploit the functional regularity of the required phase-shift operations. However, phase-shift beamforming is a valid approximation to delay-and-sum steering over only a limited bandwidth whose
Robert A. Gabel, Richard R. Kurth
openaire +1 more source
Advanced Hybrid Beamforming Design for MIMO Systems
2018 IEEE 10th Sensor Array and Multichannel Signal Processing Workshop (SAM), 2018One of the fundamental problems for hybrid beamformer design in MIMO systems is that, in Singular-Value-Decomposition (SVD) based beamforming, the analog beamformer is limited to constant modulus. In order to solve this issue, an algorithm is proposed in this paper. Specifically, the parallel data streams are expressed mathematically, and then the math
Bowen Yang, Mehdi M. Molu, Lei Zhang
openaire +1 more source
Hybrid beamforming in WCDMA antenna array system
IEEE 60th Vehicular Technology Conference, 2004. VTC2004-Fall. 2004, 2005In chip-level beamforming, the received signal vector at chip-rate and known pilot symbols are used to find a beamforming weight vector. But in a WCDMA FDD uplink, because the DPDCH and DPCCH are code-multiplexed and weighted by gain factors, the chip energy of DPCCH is less than the chip energy of DPDCH in the chip (subchip) rate received signal ...
H. Jwa, null Seungchan Bang
openaire +1 more source
Millimeter Wave Hybrid Beamforming Systems
The motivation for this thesis is the design of millimetre wave (mmWave) hybrid beamforming systems for supporting high user density. mmWave systems with hybrid digital-to-analogue beamforming (D-A BF) have the potential to fulfil 5G traffic demands. However, the capacity of mmWave systems is severely limited as each radio frequency (RF) transceiver ...openaire +1 more source
Hybrid beamforming in 5G Massive MIMO
2023 International Conference on the Confluence of Advancements in Robotics, Vision and Interdisciplinary Technology Management (IC-RVITM), 2023Rahul N Revankar +4 more
openaire +1 more source
Hybrid Beamforming in Wireless Terahertz Communications
2021Hang Yuan +3 more
openaire +1 more source