Results 81 to 90 of about 61,754 (211)

Metamaterial loaded miniaturized extendable MIMO antenna with enhanced bandwidth, gain and isolation for 5G sub-6 GHz wireless communication systems

Ain Shams Engineering Journal
Multiple-input multiple-output (MIMO) antennas are crucial for fifth-generation (5G) communications that enhance data transmission rate, spectrum utilization, channel quality, and reliability.
Md. Mhedi Hasan, Mohammad Tariqul Islam, Touhidul Alam, Phumin Kirawanich, Saeed Alamri, Ahmed S. Alshammari   +5 more
doaj   +1 more source

Optimal space-time codes for the MIMO amplify-and-forward cooperative channel

, 2006
In this work, we extend the non-orthogonal amplify-and-forward (NAF) cooperative diversity scheme to the MIMO channel. A family of space-time block codes for a half-duplex MIMO NAF fading cooperative channel with N relays is constructed.
Belfiore, Jean-Claude, Yang, Sheng
core   +5 more sources

Concurrent Sensing and Communications Based on Intelligent Metasurfaces

Advanced Electronic Materials, Volume 12, Issue 2, 21 January 2026.
An IM‐assisted concurrent ISAC scheme to exploit the otherwise wasted energy inherent in high‐order 16‐APSK DAM, to realize wireless gesture recognition thereby enabling efficient resource sharing for C‐ISAC. This architecture offers promising opportunities for next‐generation mobile internet, embodied intelligence, smart homes, smart factories, and ...
Hanting Zhao, Menglin Wei, Mingyi Li, Jiawen Xu, Jing Jin, Qixing Wang, Chunju Shao, Haiyu Ding, Lianlin Li   +8 more
wiley   +1 more source

mmWave Massive MIMO with Simple RF and Appropriate DSP

, 2017
There is considerable interest in the combined use of millimeter-wave (mmwave) frequencies and arrays of massive numbers of antennas (massive MIMO) for next-generation wireless communications systems.
Mezghani, Amine, Swindlehurst, A. Lee
core   +1 more source

Tunable Topological Directional Supercoupler and Applications in THz On‐Chip Communication

Laser &Photonics Reviews, Volume 20, Issue 1, 8 January 2026.
A topological directional supercoupler is demonstrated, enabling dual‐channel 50 Gbps on‐chip terahertz communication with phototunable power splitting ratios. The achieved sub‐wavelength scale coupling area, sharp waveguide bends, and momentum‐conserved coupling process allow for ultra‐compact and efficient terahertz topological photonic integrated ...
Ridong Jia, Wenhao Wang, Yi Ji Tan, Thomas Caiwei Tan, Manoj Gupta, Zhonghua Gu, Prakash Pitchappa, Pascal Szriftgiser, Guillaume Ducournau, Ranjan Singh   +9 more
wiley   +1 more source

Low SNR Capacity of Noncoherent Fading Channels

, 2007
Discrete-time Rayleigh fading single-input single-output (SISO) and multiple-input multiple-output (MIMO) channels are considered, with no channel state information at the transmitter or the receiver. The fading is assumed to be stationary and correlated
Hajek, Bruce, Lapidoth, Amos, Sethuraman, Vignesh, Wang, Ligong   +3 more
core   +4 more sources

Robust Spectral and Energy Efficiency Tradeoff for RIS‐Aided Multi‐User Communication

IET Communications, Volume 20, Issue 1, January/December 2026.
In this work, an RIS‐aided multi‐user network with imperfect CSI is investigated. Correspondingly, we focus on balancing SE and EE through the collaborative design of the base station (BS)'s precoding matrix and the RIS's phase shifts, which consider the transmit power budget and the channel uncertainties constraints.
Xiandeng He, Yilin Wang, Shun Zhang
wiley   +1 more source

A Massive Grant‐Free Random Access Scheme Based on Spectrum Sensing and Preamble Delay

IET Communications, Volume 20, Issue 1, January/December 2026.
This paper introduces cognitive radio (CR) and preamble delay (PD) to reduce access collisions, together with non‐orthogonal multiple access (NOMA) to improve spectrum efficiency, and thus proposes an efficient CR‐NOMA‐PD‐based massive grant‐free random multiple access scheme.
Jing Zhang, Zhuang‐Zhuang Wei, Yu‐Qi Zhang, Hong‐Xu Gao, Hai‐Tao Zhao, Hong‐Bo Zhu   +5 more
wiley   +1 more source

Phased array antennas in MIMO receiver

Journal of Telecommunications and Information Technology, 2006
In this paper, a computer simulation of a MIMO system comprising phased array antennas (PAA) in all receiving branches is presented. In order to examine the system performance under relatively realistic conditions, a ray-tracing simulator was applied to generate a baseband channel impulse response matrix H.
Sebastian Kozłowski, Yevhen Yashchyshyn, Józef Modelski   +2 more
openaire   +2 more sources

An Energy‐Tiered Clustering‐Based Blind Detector for RIS‐RSM Systems

IET Communications, Volume 20, Issue 1, January/December 2026.
This paper proposes an energy‐tiered structure initialization (ETSI) algorithm for blind detection in reconfigurable intelligent surface (RIS)‐assisted spatial modulation systems. By decomposing the modulation constellation into multiple energy tiers and leveraging structured prototype initialization with tier‐normalized refinement, ETSI effectively ...
Lijuan Zhang, Juncheng Zhou, Zhongpeng Wang   +2 more
wiley   +1 more source