Results 221 to 230 of about 41,325 (264)
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Transfer Beamforming via Beamforming for Transfer
IEEE Transactions on Mobile Computing, 2023Xueyuan Yang +3 more
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Spherical Fraction Beamforming
IEEE/ACM Transactions on Audio, Speech, and Language Processing, 2020This paper describes a beamforming method for one-eighth, quarter, and half-spaces, bounded by rigid planes. The proposed approach is based on the spherical fraction harmonic decomposition, similar to that of spherical harmonics decomposition for the whole sphere. The definition of these functions is given in detail.
Lecomte, Pierre +2 more
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An improved eigenvector beamformer
ICASSP '84. IEEE International Conference on Acoustics, Speech, and Signal Processing, 2005Most techniques for computing beamformer tap weights do so by maximizing the overall signal-to-noise ratio at the system output, where noise includes both thermal noise and directional interference. This is the optimal solution if the two noise sources count equally.
Todd K. Citron, Thomas Kailath
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On a modified Duvall beamformer
ICASSP-88., International Conference on Acoustics, Speech, and Signal Processing, 2003The authors are concerned with the use of derivative null constraints in an adaptive beamformer in the spatial and frequency domains with respect to the Duvall beamformer to obtain a modified Duvall beamformer. Simulation results demonstrate that the modified beamformer's performance is improved under the following conditions:L jammer frequencies are ...
B. Chang, N. Ahmed
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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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Source localization and beamforming
IEEE Signal Processing Magazine, 2002Distributed sensor networks have been proposed for a wide range of applications. The main purpose of a sensor network is to monitor an area, including detecting, identifying, localizing, and tracking one or more objects of interest. These networks may be used by the military in surveillance, reconnaissance, and combat scenarios or around the perimeter ...
Joe C. Chen, Kung Yao, Ralph E. Hudson
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Opportunistic Beamforming with Single Beamforming Matrix for Virtual Antenna Arrays
2011 IEEE International Conference on Communications (ICC), 2011Opportunistic beamforming is a promising technique for downlink channels in cellular systems. When opportunistic beamforming is to support multiple users at a time, it is important to form multiple beams with as little interference as possible. In the conventional approach with limited feedback of channel state information from users, the best ...
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Robust and distributed beamforming
2009 International Conference on Wireless Communications & Signal Processing, 2009This paper studies the use of amplify-and-forward (AF) relays for robust beamforming, with the aid of imperfect channel state information (CSI) at the sender. In particular, the maximization of the worst-case signal-to-noise ratio (SNR) at the destination terminal is studied under a bounded spherical region for the norm of CSI error vector.
Gan, Zheng +3 more
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Waveforming: An Overview With Beamforming
IEEE Communications Surveys & Tutorials, 2018By leveraging the natural multipath propagation of electromagnetic waves, waveforming is proposed as a promising paradigm that treats each multipath component in a wireless channel as a virtual antenna to exploit the spatial diversity. As the most commonly known waveforming technique for wideband systems, the time-reversal (TR) signal transmission ...
Qinyi Xu +4 more
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Multiresolution Quadtree Beamformer
IEEE International Conference on Acoustics Speech and Signal Processing, 2002The delay-sum beamformer (DSBF) is a space-time domain beamforming,method that performs coherent summation of sensor data. However, the computational complexity of finding the steered response over all angles is O(N3). In this paper, an O(N2log 2 N) space-time domain beamforming algorithm it is proposed.
Seung-Mok Oh, James H. McClellan
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