Results 191 to 200 of about 4,041 (226)

Hybrid Beamforming Architectures of Terahertz Communications

2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), 2019
Hybrid beamforming technology is attractive for Terahertz (THz) communications to compensate the huge path loss, owing to the benefits of low hardware complexity and acceptable power consumption. Multiple hybrid beamforming architectures in the THz band, including the fully-connected (FC), array-of-subarray (AoSA) and dynamic array-of-subarray (DAoSA ...
Longfei Yan, Chong Han, Qing Ding
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Millimeter-Wave NOMA with Hybrid Beamforming

2019 IEEE International Conference on Communications Workshops (ICC Workshops), 2019
This paper investigates the application of nonorthogonal multiple access in millimeter-Wave communications (mmWave-NOMA) with hybrid beamforming. A user grouping algorithm is first proposed according to channel gains and channel correlations. Whereafter, a joint hybrid beamforming and power allocation problem is formulated to maximize the achievable ...
Lipeng Zhu, Jun Zhang, Zhenyu Xiao, Xianbin Cao   +3 more
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Hybrid beamforming for massive MIMO

2018
Deployed with a large number of antenna elements, massive multiple-input-multiple-output (MIMO) systems will be an important component of next generation wireless systems, because they provide tremendous increase of spectral efficiency. However, two major challenges hinder the implementation of massive MIMO in a practical system.
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New Predistorter Architecture for Hybrid Beamforming Transmitter

2020 IEEE 92nd Vehicular Technology Conference (VTC2020-Fall), 2020
In this paper, we propose a novel subarray digital predistorter (DPD) with timely shared feedback for hybrid beamforming transmitters. This enables a set of power amplifiers (PAs) to be linearized with a single DPD. The output signal in the proposed DPD comprises the weighted combination of the inverse functions of the individual PAs from an array ...
Alexander N. Lozhkin, Toru Maniwa
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Front-Ends for Hybrid Beamforming AESA's

2011 IEEE Compound Semiconductor Integrated Circuit Symposium (CSICS), 2011
Challenges and opportunities will be discussed for the upcoming generation of AESA's. Due to flexibility and performance, beamforming schemes will be hybrid, resulting in new challenges for front-end IC's. These will be discussed and implementations of these new architectures will be shown.
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Hybrid adaptive/nonadaptive beamforming for ultrasound imaging

2013 IEEE International Conference on Acoustics, Speech and Signal Processing, 2013
We 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
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Hybrid phase-shift/time-delay digital beamforming

The Journal of the Acoustical Society of America, 1982
Digital 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
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Advanced Hybrid Beamforming Design for MIMO Systems

2018 IEEE 10th Sensor Array and Multichannel Signal Processing Workshop (SAM), 2018
One 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
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Hybrid beamforming in WCDMA antenna array system

IEEE 60th Vehicular Technology Conference, 2004. VTC2004-Fall. 2004, 2005
In 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
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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 ...
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