Results 61 to 70 of about 3,119 (218)

A modified Alamouti scheme for frequency selective channels incorporating turbo equalization [PDF]

, 2002
The Alamouti scheme can achieve transmit diversity in the presence of frequency selective flat fading channels. The technique has received considerable attention mainly because of its processing simplicity. Recently, a modification to the Alamouti scheme
Nix, AR, Fletcher, PN, Piechocki, RJ, Kasparis, C   +3 more
core   +1 more source

Hexagonal Multicarrier Faster-Than-Nyquist Signaling

IEEE Access, 2017
Multicarrier faster-than-Nyquist (MFTN) signaling is a spectral efficient modulation scheme for future communication systems. In MFTN signaling, the intersymbol interference (ISI) and intercarrier interference (ICI) are introduced intentionally by the ...
Siming Peng, Aijun Liu, Xiaofei Pan, Heng Wang   +3 more
doaj   +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

Maximum-Likelihood Seauence Estimation of Digital Sequences i&he Presence of

, 2008
-A maximum-likelihood sequence estimator for a digital pulse-amplitude-modulated sequence in the presence of finite intersymbol interference and white Gaussian noise is developed.
Intersymbol Interference
core  

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

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

Novel Intersymbol Interference Cancellation Scheme to Enable Parallel Computational and High-Performance Faster-Than-Nyquist Signaling

IEEE Access, 2017
In this paper, we deal with the intersymbol interference (ISI) cancellation problem induced by the faster-than-Nyquist (FTN) signaling. In the traditional FTN signaling, the detection delay at the receiver depends on the number of states of the ISI ...
Bin Qian, Xiaokang Wang, Jinming Wen, Shengli Zhang, Changsheng Chen   +4 more
doaj   +1 more source

Comparison of precoding methods for broadband MIMO systems

, 2009
In this paper we investigate non-linear precoding solutions for the problem of broadband multiple-input multipleoutput (MIMO) systems. Based on a broadband singular value decomposition (BSVD) we can decouple a broadband MIMO channel into independent ...
Waleed Al-Hanafy, Stephan Weiss, Alhanafy, W.E.A.E., Weiss, S.   +3 more
core   +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

Application of time reversal technique in shallow water environment

Archives of Acoustics, 2014
Underwater acoustic communications in shallow water environment is a challenging problem due to the intersymbol interference caused by time-varying dispersive multipath channel.
Sławomir Jastrzębski
doaj