Results 31 to 40 of about 54,503 (247)
How to Solve the Problem of Bad Performance of Cooperative Protocols at Low SNR
EURASIP Journal on Advances in Signal Processing, 2007 We propose some new adaptive amplify-and-forward (AF) and decode-and-forward (DF) protocols using a selection. The new selection criterion is a function of the instantaneous capacities of all possible transmission schemes (with or without cooperation ...
Jean-Claude Belfiore +2 more
doaj +1 more source
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 +4 more
doaj +1 more source
A Low-Complexity Precoding Scheme for the Downlink of Multi-Cell Multi-User MIMO AF System [PDF]
, 2012 Because of its simplicity, amplify-and-forward (AF) is one of the most popular cooperative relaying technique. Relays are used in cooperative communication to improve reliability, coverage or spectral efficiency of cell-edge users.
Héliot, Fabien +2 more
core +1 more source
Piggybacking Codes for Network Coding: The High/Low SNR Regime
, 2017 We propose a piggybacking scheme for network coding where strong source inputs piggyback the weaker ones, a scheme necessary and sufficient to achieve the cut-set upper bound at high/low-snr regime, a new asymptotically optimal operational regime for the
Ghanem, Samah A. M.
core +1 more source
Performance Comparison between Adaptive and Fixed Transmit Power in Underlay Cognitive Radio Networks [PDF]
, 2013 In this paper, we compare the performance in terms of symbol error probability, data rate and power consumption of the use of fixed transmit power (FTP) and adaptive transmit power (ATP) in underlay cognitive radio networks. The use of FTP alleviates the
Ajib, Wessam +2 more
core +1 more source
The Cramer-Rao Bound for channel estimation in block fading amplify-and-forward relaying networks [PDF]
, 2010 In this paper, we express the Cramer-Rao Bound (CRB) for channel coefficient and noise variance estimation at the destination of an Amplify-and- Forward (AF) based cooperative system, in terms of the a posteriori expectation of the codewords.
Aerts, Nico +2 more
core +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
Performansi Sistem Komunikasi Kooperatif Menggunakan Teknik Amplify and Forward (Af) Dengan Modulasi Quadrature Phase Shift Keying (Qpsk) [PDF]
, 2013 Pada media nirkabel sinyal yangdikirimkan sering mengalami gangguan yang dapatmenurunkan kinerja sistem. Hal ini dapat membuat kondisikanal menurun, mengakibatkan kapasitas kanal dankeandalan data yang dikirimkan juga menurun.
M. Fauzan Edy Purnomo, ST., MT., Alvin Yazlin., Ali Mustofa, ST., MT
core
When Can a Relay Reduce End-to-End Communication Delay?
, 2014 The impact of relaying on the latency of communication in a relay channel is studied. Both decode-forward (DF) and amplify-forward (AF) are considered, and are compared with the point-to-point (P2P) scheme which does not use the relay. The question as to
Chaaban, Anas, Sezgin, Aydin
core +1 more source
Advanced Engineering Materials, EarlyView.Stabilization of L‐PBF Ni50.7Ti49.3 under low‐cycle loading was investigated. Recoverable strain after cycling was dependent on the amount of applied load. Recovery ratio was 53.4% and 35.1% at intermediate and high load, respectively. The maximum total strain reached 10.3% at a high load of 1200 MPa.
Ondřej Červinek +5 more
wiley +1 more source