Results 31 to 40 of about 8,320 (255)

Performance Comparison of Relay-Based Covert Communications: DF, CF and AF

Sensors, 2023
In this paper, we investigate the performance of covert communications in different types of a relay system: decode-and-forward (DF), compress-and-forward (CF) and amplify-and-forward (AF).
Jihwan Moon
doaj   +1 more source

Performansi Sistem Komunikasi Kooperatif Menggunakan Teknik Amplify And Forward (AF) Dengan Modulasi Quadrature Phase Shift Keying (QPSK), [PDF]

, 2013
Pada media nirkabel sinyal yang dikirimkan sering mengalami gangguan yang dapat menurunkan kinerja sistem. Hal ini dapat membuat kondisi kanal menurun, mengakibatkan kapasitas kanal dan keandalan data yang dikirimkan juga menurun.
Yazlin, Alvin
core   +3 more sources

Near-Capacity Turbo Coded Soft-decision Aided DAPSK/Star-QAM for Amplify-and-Forward based Cooperative Communications [PDF]

, 2013
Multilevel Differential Amplitude and Phase-Shift Keying (DAPSK) schemes do not require any channel estimation, which results in low complexity.
Liang, Dandan, Ng, Soon Xin, Hanzo, Lajos   +2 more
core   +1 more source

Design and Experimental Investigation of Decode-and-Forward and Amplify-and-Forward Relaying FSO-CDMA

IEEE Photonics Journal, 2022
The scheme of combining relay and optical code division multiple access (OCDMA) is one of the effective methods to improve the reliability and security of free space optical (FSO) communication system.
Jianhua Ji, Jiahe Zhang, Ke Wang, Ming Xu, Yufeng Song   +4 more
doaj   +1 more source

Optimization of Full-Duplex Relaying System With Non-Linear Energy Harvester

IEEE Access, 2020
Simultaneous wireless information and power transfer (SWIPT) is a promising technique to prolong the lifetime of energy constrained relay-based systems. Most of the existing literature on relay-based SWIPT systems incorporate linear energy harvesting (EH)
Syed Adil Abbas Kazmi, Sinem Coleri
doaj   +1 more source

Auction-Based Secondary Relay Selection on Overlay Spectrum Sharing in Hybrid Satellite–Terrestrial Sensor Networks

Sensors, 2019
In this paper, we investigate the auction-based secondary relay selection on overlay spectrum sharing in hybrid satellite–terrestrial sensor networks (HSTSNs), where both the decode-and-forward (DF) and amplify-and-forward (AF) relay protocols are ...
Xiaokai Zhang, Bangning Zhang, Kang An, Zhuyun Chen, Daoxing Guo   +4 more
doaj   +1 more source

Code-rate-optimized differentially modulated near-capacity cooperation [PDF]

, 2011
It is widely recognized that half-duplex-relay-aided differential decode-and-forward (DDF) cooperative transmission schemes are capable of achieving a cooperative diversity gain, while circumventing the potentially excessive-complexity and yet inaccurate
Wang, Li, Kong, Lingkun, Ng, Soon, Hanzo, Lajos   +3 more
core   +2 more sources

Investigating the Effect of Inclination Angle and the Influence of Scan Parameters on the Appearance and Thermal and Mechanical Properties of Filigree Tension Rods of LPBF‐Manufactured NiTi Shape‐Memory Alloys

Advanced Engineering Materials, EarlyView.
This article investigates the dependence of the properties on the manufacturing orientation in the form of the inclination angle to the build plate of LPBF‐fabricated NiTi rods with a diameter of 150–220 µm. Metallographic, chemical, thermal, and mechanical characterization show behavior under identical manufacturing conditions that ranges from ...
Sandra Herzig, Michael Werner, Christian Rotsch   +2 more
wiley   +1 more source

A Coalitional Formation Game for Physical Layer Security of Cooperative Compressive Sensing Multi-Relay Networks

Sensors, 2018
Cooperative relaying is an effective technology to improve the capacity of physical-layer security, in which the relay helps forward the received signal to the destination. In this paper, a cooperative compressive sensing and amplify-and-forward (CCS-AF)
Jialun Li, Shuai Chang, Xiaomei Fu, Liang Zhang, Yishan Su, Zhigang Jin   +5 more
doaj   +1 more source

Effect of Cu and CuP Additions on the Microstructure and Nanoindentation‐Based Fracture Behavior of CoNiAlSi Ferromagnetic Shape Memory Alloys

Advanced Engineering Materials, EarlyView.
Cu and combined Cu–P microalloying refine the microstructure and enhance the nanoindentation‐derived fracture resistance of CoNiAlSi ferromagnetic shape memory alloys without suppressing the martensitic transformation. Comparative SEM, DSC, and nanoindentation results reveal that the CuP‐containing alloy provides the most balanced response, achieving ...
Mehmet Demir
wiley   +1 more source