Results 181 to 190 of about 2,236 (212)

Sidelobe Suppression for Blind Adaptive Beamforming with Sparse Constraint

IEEE Communications Letters, 2011
Blind adaptive beamforming has been widely used in radio communication systems for long-distance and high-speed transmission. The high sidelobe level of the beam pattern using the classic blind beamforming algorithm known as spectral self-coherent restoral method may lead to severe degradations under the conditions of unexpected interferences or high ...
Jiyan Huang, Qun Wan
exaly   +2 more sources

Beamforming of Sparse Cylindrical Arrays

2017
As sparse arrays cost fewer elements, they are less expensive than dense arrays and could be applied widely in antenna and sonar deployment, two sparse cylindrical arrays are proposed in this paper. According to the characteristic of cylindrical array, it can be seen as a linear array whose elements are the identical circular arrays.
Na Wu, Qilian Liang
openaire   +1 more source

Frequency-difference beamforming with sparse arrays

The Journal of the Acoustical Society of America, 2012
When an acoustic signal is transmitted to a remote receiving array with sufficient aperture and transducer density, the arrival direction(s) of the ray paths linking the source and the array may be determined by beamforming the transducer recordings. However, when the receiving array is sparse, i.e. there are many signal wavelengths between transducers,
Shima H. Abadi, Heechun Song, David R. Dowling   +2 more
openaire   +1 more source

Thinned and Sparse Beamforming for Semicircular FDAs in the Transmit–Receive Domain

Remote Sensing
The thinned and sparse beamforming for semicircular FDAs were investigated, where the excitation amplitudes were also considered in thinned semicircular FDAs, and only the elements’ positions were incorporated into the sparse semicircular FDA.
Anyi Wang, Yanhong Xu, Xiao Meng
exaly   +2 more sources

Incoherent Synthesis of Sparse Arrays for Frequency-Invariant Beamforming

IEEE/ACM Transactions on Audio, Speech, and Language Processing, 2019
Frequency-invariant beamformers are used to prevent signal waveform distortions in real world applications like audio, underwater acoustics, and radar. Most of existing methods assume uniform arrays, and only few consider sparse designs, which may lead to higher performance in terms of robustness and directivity factor.
Yaakov Buchris, Alon Amar, Jacob Benesty, Israel Cohen   +3 more
openaire   +1 more source

Ultra-wideband beamforming in sparse arrays

IEE Proceedings H Microwaves, Antennas and Propagation, 1991
Transient radiated fields caused by impulsively excited apertures and aperture response caused by incident impulsive waves has been the subject of considerable research in acoustics. This research is also of importance to wideband radar. Medical ultrasound steered phased arrays use transmitted pulses consisting of from one to three cycles of a damped ...
F. Anderson, W. Christensen, L. Fullerton, B. Kortegaard   +3 more
openaire   +1 more source

On the Performance of Random Beamforming in Sparse Millimeter Wave Channels

IEEE Journal of Selected Topics in Signal Processing, 2016
The performance of random beamforming (RBF) with partial channel state information (CSI) feedback is investigated here for millimeter wave (mmWave) multiuser multiple-input single-output (MU-MISO) downlink systems using the uniform random multipath (UR-MP) channel model.
Gilwon Lee, Youngchul Sung, Marios Kountouris   +2 more
openaire   +1 more source

A sparse blocking matrix for multiple constraints GSC beamformer

2012 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2012
Modern high performance speech processing applications incorporate large microphone arrays. Complicated scenarios comprising multiple sources, motivate the use of the linearly constrained minimum variance (LCMV) beamformer (BF) and specifically its efficient generalized sidelobe canceler (GSC) implementation.
Shmulik Markovich Golan, Sharon Gannot, Israel Cohen   +2 more
openaire   +1 more source

Sparse beamforming for interlaced clustering in distributed antenna systems

2017 9th International Conference on Wireless Communications and Signal Processing (WCSP), 2017
In ultra-dense cellular networks, research works on enhancing cell edge performance receive considerable attention. Based on interlaced clustering, we propose a heuristic sparse beamforming strategy to improve the cell edge throughput effectively in distributed antenna systems (DASs).
Xinjiang Xia, Yu Zhang 0012, Jiamin Li 0001, Pengcheng Zhu 0001, Dongming Wang 0002, Xiaohu You 0001   +5 more
openaire   +1 more source

Gridless sparse beamforming with Wirtinger gradients

The Journal of the Acoustical Society of America
A gridless sparse beamforming (direction-of-arrival (DOA) estimation) method using gradient-based optimization is presented. The approach minimizes the fit between the sample covariance matrix (SCM) and a reconstructed covariance matrix constrained to contain only a few atoms.
Yongsung Park, Peter Gerstoft, Christoph Mecklenbräuker   +2 more
openaire   +1 more source