Results 71 to 80 of about 4,217 (206)

Reduced Complexity Decoding for Bit-Interleaved Coded Multiple Beamforming with Constellation Precoding

, 2011
Multiple beamforming is realized by singular value decomposition of the channel matrix which is assumed to be known to both the transmitter and the receiver.
Ayanoglu, Ender, Li, Boyu, Park, Hong Ju
core   +1 more source

Application of Two‐Group Drift‐Flux Model to Improve Two‐Group Interfacial Area Concentration Model for Dispersed Gas–Liquid Flows in Rod Bundles

International Journal of Energy Research, Volume 2025, Issue 1, 2025.
Understanding interfacial area concentration (IAC) is crucial for analyzing gas–liquid interfacial transfer processes of mass, momentum, and energy. A two‐group IAC model, which considers the dependence of bubble size on two‐phase flow characteristics, has demonstrated outstanding potential in modeling the IAC in dispersed two‐phase flows. Based on the
Meng Yu, Takashi Hibiki, Naofumi Tsukamoto, Shuichiro Miwa, Payman Jalali   +4 more
wiley   +1 more source

A validation study of the SLTHEN code for hexagonal assemblies of wire-wrapped pins using liquid metal heating experiments

Nuclear Engineering and Technology
This paper presents a validation study of the subchannel analysis code SLTHEN used for the core thermal-hydraulic design of the Prototype Gen-IV sodium-cooled fast reactor (PGSFR).
Sun Rock Choi, Junkyu Han, Huee-Youl Ye, Jonggan Hong, Won Sik Yang   +4 more
doaj   +1 more source

Performance Enhancement of OFDM‐Based Hybrid Multiplexed Ro‐FSO System Under Complex Rain Conditions

International Journal of Optics, Volume 2025, Issue 1, 2025.
The radio over free‐space optical (Ro‐FSO) link serves as an effective and resilient solution for distributing radio frequency (RF) signals over turbulent and adverse weather conditions, using high‐frequency optical carriers. This work proposes an architecture for a high‐speed, spectral‐efficient, and long‐reach hybrid multiplexed Ro‐FSO system that ...
Shivaji Sinha, Chakresh Kumar, Ghanendra Kumar, Mehtab Singh, Giovanni Magno   +4 more
wiley   +1 more source

Overview of Hybrid Satellite–Terrestrial Networks (HSTNs): Key Technologies and Upcoming Challenges

Journal of Computer Networks and Communications, Volume 2025, Issue 1, 2025.
Hybrid satellite–terrestrial networks (HSTNs) represent a crucial technology in the advancement of next‐generation communication systems, including 6 G. This paper presents an in‐depth review of cooperative and cognitive HSTNs, highlighting the key technologies, system models, and performance metrics that define their operation.
Akbar Asgharzadeh-Bonab, Hashem Kalbkhani, Yaser Azimi, Farid Ahmadi, Giovanni Pau   +4 more
wiley   +1 more source

Comparative analysis of neutronics/thermal-hydraulics multi-scale coupling for LWR analysis [PDF]

, 2008
The aim of the research described in this paper is to perform consistent comparative analyses of two different approaches for coupling of two-scale, two-physics phenomena in reactor core calculations. The physical phenomena of interest are the neutronics
Avramova, Maria, Cuervo Gómez, Diana, Ivanov, K., Jiménez Escalante, Javier   +3 more
core   +1 more source

Modernization of the SC-INT subchannel thermal-hydraulic code

Nuclear Energy and Technology
The article presents the main results of the work cycle on modernizing the source code of the SC-INT computer program designed for subchannel thermal-hydraulic calculations of the water-cooled nuclear reactors cores. The mathematical description of the program is briefly provided, including the method of allocation of control volumes in space, the ...
Evgeny A. Vertikov, Kirill V. Zaporzhin, Dmitry A. Oleksyuk, Vladislav A. Khamaza, Alexey M. Khudykin, Maxim A. Glazov, Oleg N. Morozkin   +6 more
openaire   +1 more source

Securing Communication Channels: An Advanced Steganography Approach With Orthogonal Frequency Division Multiplexing (OFDM)

Journal of Electrical and Computer Engineering, Volume 2025, Issue 1, 2025.
Orthogonal frequency division multiplexing (OFDM) is a widely used modern communications technology due to its resistance to selective frequency fading and efficient use of spectrum. However, the security of OFDM signals remains a source of serious concern, especially in the face of network encryption that aims to disrupt communications or extract ...
Ammar Mohammedali Fadhil, Ali Y. Jaber, Rajesh Khanna   +2 more
wiley   +1 more source

Validation of the Subchannel Code SUBCHANFLOW Using the NUPEC PWR Tests (PSBT)

Science and Technology of Nuclear Installations, 2012
SUBCHANFLOW is a computer code to analyze thermal-hydraulic phenomena in the core of pressurized water reactors, boiling water reactors, and innovative reactors operated with gas or liquid metal as coolant.
Uwe Imke, Victor Hugo Sanchez
doaj   +1 more source

Robust User Identification in Massive MIMO Systems Using Compressed Sensing Techniques

Journal of Electrical and Computer Engineering, Volume 2025, Issue 1, 2025.
In 5G and beyond 5G wireless communication networks, massive multiple‐input multiple‐output (MIMO) technologies are essential for improved energy and spectrum efficiency. These systems are very effective at channel estimation and active user detection in situations with many users, and only a small percentage of them send data during a given time frame.
Ubaid Umar, Athar Waseem, Aqdas Naveed, Jayshri Kulkarni   +3 more
wiley   +1 more source