Results 31 to 40 of about 285 (138)

Design and Reception Method of Code Shift Keying Signals With Power‐of‐Two Phase Intervals

IET Radar, Sonar &Navigation, Volume 19, Issue 1, January/December 2025.
A novel approach for the design and reception of CSK signals with a phase interval mapping of power‐of‐two chips is proposed. This method is capable of significantly reducing the demodulation complexity while mitigating the intersymbol interference. ABSTRACT Precise point positioning (PPP) technology has garnered extensive attention for its ability to ...
Nengjie Yu, Dun Wang, Xiaohui Ba, Mingquan Lu, Shaobo Shen   +4 more
wiley   +1 more source

A Flexible Constrained ICA Approach for Multisubject fMRI Analysis

International Journal of Biomedical Imaging, Volume 2025, Issue 1, 2025.
Large‐scale analysis of functional connectivity within intrinsic brain networks using functional magnetic resonance imaging (fMRI) data has been widely used for identifying biomarkers in various psychiatric disorders. While the emerging access to large neuroimaging datasets provides unprecedented opportunities for exploring brain functions, they also ...
Hanlu Yang, Trung Vu, Ehsan Ahmed Dhrubo, Vince D. Calhoun, Tülay Adali, Francisco Javier Gallegos Funes   +5 more
wiley   +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

Performance of Turbo Interference Cancellation Receivers in Space-Time Block Coded DS-CDMA Systems

EURASIP Journal on Wireless Communications and Networking, 2008
We investigate the performance of turbo interference cancellation receivers in the space time block coded (STBC) direct-sequence code division multiple access (DS-CDMA) system.
Mashwama DerrickB, Bejide EmmanuelOluremi   +1 more
doaj   +2 more sources

Interference Cancellation Using Replica Signal for HTRCI-MIMO/OFDM in Time-Variant Large Delay Spread Longer Than Guard Interval

Journal of Electrical and Computer Engineering, 2012
Orthogonal frequency division multiplexing (OFDM) and multiple-input multiple-output (MIMO) are generally known as the effective techniques for high data rate services.
Yuta Ida, Chang-Jun Ahn, Takeshi Kamio, Hisato Fujisaka, Kazuhisa Haeiwa   +4 more
doaj   +1 more source

3D Geometry Modeling Method for MIMO Communication Systems Using Correlation Coefficients

Journal of Computer Networks and Communications, Volume 2025, Issue 1, 2025.
Channel models are the basis of system design, theoretical analysis, performance evaluation, optimization, and deployment of communication systems in wireless fading environments. LTE, a global standard for high‐speed data transmission, relies on channel modeling techniques due to its multiple‐input multiple‐output (MIMO) architecture. In MIMO systems,
Hassan Abdollahpour, S. Abolfazl Hosseini, Nima Raeisi, Farooque Azam   +3 more
wiley   +1 more source

Information-Theoretic Analysis of Underwater Acoustic OFDM Systems in Highly Dispersive Channels

Journal of Electrical and Computer Engineering, 2012
This paper investigates the signal-to-interference ratio and the achievable rates of underwater acoustic (UA) OFDM systems over channels where time and frequency dispersion are high enough that (i) neither the transmitter nor the receiver can have a ...
Francois-Xavier Socheleau, Milica Stojanovic, Christophe Laot, Jean-Michel Passerieux   +3 more
doaj   +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

OENMOP: Loss‐Aware 4 × 4 and 5 × 5 and Scalable Nonblocking Optical Switches Designed for Odd–Even Routing Algorithm for Chip‐Scale Interconnection Networks

Journal of Electrical and Computer Engineering, Volume 2025, Issue 1, 2025.
In this paper, optical routers play an indispensable role in the ONoCs. The 4 × 4, 5 × 5, and scalable optical routers based on Mach–Zehnder interferometer (MZI) and microring resonator (MRR) are proposed. These routers are designed for a deadlock‐free Odd–Even turning model.
Negin Bagheri Renani, Elham Yaghoubi, Mina Mohammadirad, Nihal F. F. Areed   +3 more
wiley   +1 more source

Multi-User Detection for Group Orthogonal Multi-Carrier Code Division Multiple Access System in Frequency Selective Rayleigh Fading Channel

Journal of Engineering and Sustainable Development, 2008
Code Division Multiple Access (CDMA) suffers from multi-user interference (MUI), and intersymbol interference (ISI) under frequency selective multi-path fading channels. Orthogonal Frequency Division Multiple access (OFDM) is MUI free but achieves lower
Maha George Zia, Harith Akram Nassir
doaj