Results 41 to 50 of about 1,295,659 (215)

On the effect of SNR and superdirective beamforming in speaker diarisation in meetings [PDF]

, 2012
This paper examines the effect of sensor performance on speaker diarisation in meetings and investigates the use of more advanced beamforming techniques, beyond the typically employed delay-sum beamformer, for mitigating the effects of poorer sensor ...
Mike Lincoln, Zwyssig, E., Renals, S., Lincoln, M., Steve Renals, Erich Zwyssig   +5 more
core   +1 more source

Precoding and Beamforming Techniques in mmWave-Massive MIMO: Performance Assessment

IEEE Access, 2022
Massive MIMO and mmWave communication are the technologies for achieving 5G design goals. Fortunately, these two technologies share a symbiotic integration.
Tewelgn Kebede, Yihenew Wondie, Johannes Steinbrunn, Hailu Belay Kassa, Kevin T. Kornegay   +4 more
doaj   +1 more source

Multiple-Beam Selection With Limited Feedback for Hybrid Beamforming in Massive MIMO Systems

IEEE Access, 2017
Hybrid multiple-input multiple-output (MIMO) systems have been thought as a promising technology in future 5G. Compared with conventional digital MIMO systems, such a structure is equipped with fewer RF chains, which would reduce the computational ...
Yuwei Ren, Yingmin Wang, Can Qi, Yinjun Liu   +3 more
doaj   +1 more source

Recent Advances in Programmable Metasurfaces and Meta‐Devices

Advanced Electronic Materials, EarlyView.
Programmable metasurfaces enable various novel functionalities by dynamically tuning electromagnetic wavefronts. This article provides a comprehensive review of recent advances in microwave and terahertz programmable metasurfaces, covering electrical, thermal, optical, and mechanical control mechanisms.
Linda Shao, Chong He, Nan Wang, Liming Si, Weiren Zhu   +4 more
wiley   +1 more source

Physics Informed Generative Surrogate Learning for Full Wave Validated Real Time Beamforming in Programmable Metasurfaces

Advanced Electronic Materials, EarlyView.
A physics‐guided generative surrogate framework is developed for programmable metasurface beamforming. Mode‐conditioned binary state generation, aperture‐physics prediction, routed residual correction, NSGA‐II optimization, and CST validation are combined to support fast candidate screening and full‐wave beam refinement across single‐beam, dual‐beam ...
Wenqian Liu, Weidong Chen, Chang Chen, Xiang Zhang, Sensong An   +4 more
wiley   +1 more source

Spaceborne Reflector SAR Systems with Digital Beamforming [PDF]

, 2012
Spaceborne Synthetic Aperture Radar (SAR) imaging enters an era where increasingly short revisit times, or large swath widths, respectively, and high spatial resolutions are requested.
Patyuchenko, Anton, Huber, Sigurd, Moreira, Alberto, Younis, Marwan, Krieger, Gerhard   +4 more
core   +1 more source

Low complexity but near optimal hybrid beamforming design in tera‐hertz communication systems: principles and opportunities

IET Microwaves, Antennas & Propagation, 2023
Next generation communication systems go to tetra‐hertz (THz) frequency bands. In this article, low‐complexity but near‐optimal hybrid beamforming design is investigated in THz by considering its unique channel characteristics and discuss potential ...
Qingdong Yue, Jie Hu, Kun Yang
doaj   +1 more source

Overcoming the Phase Discontinuity Problem in RIS Optimization: A Robust and Scalable Phase‐Aware Deep Regression Framework via Hybrid CNN–LSTM Architecture

Advanced Intelligent Systems, EarlyView.
The phase discontinuity problem—where the cyclic nature of phase angles causes catastrophic errors near the ±π boundary—is a fundamental obstacle in learning‐based reconfigurable intelligent surface (RIS) optimization. A phase‐aware hybrid CNN–LSTM framework resolves this by decomposing phase predictions into sine–cosine components, mapping circular ...
Seda Savaşçı Şen, Ali Çalhan, Murtaza Cicioğlu, Oğuzhan Demiryürek   +3 more
wiley   +1 more source

Sequential Hybrid Beamforming for Radio Stripes

IEEE Access
Cell-free (CF) massive multiple-input multiple-output (mMIMO) systems will revolutionize wireless communication by moving away from traditional base stations (BSs). By eliminating conventional cell boundaries, CF mMIMO deploys a large number of distributed access points (APs), enabling seamless connectivity across a wide area, more flexible resource ...
Joumana Kassam, Daniel Castanheira, Adão Silva, Rui Dinis, Atílio Gameiro   +4 more
openaire   +3 more sources

Adaptive minimum symbol error rate beamforming assisted detection for quadrature amplitude modulation

, 2008
—We consider beamforming assisted detection for multiple antenna aided multiuser systems that employ the bandwidth efficient quadrature amplitude modulation scheme.
Chen, Sheng, Livingstone, A., Hanzo, Lajos, Du, H.-Q.   +3 more
core   +1 more source