Results 41 to 50 of about 159,814 (309)
Energy Efficient Joint Power Optimization for Full-Duplex Relaying
IEEE Access, 2019 Full-duplex (FD) relaying is a promising technology for the next generation communication systems. In this paper, we aim to jointly optimize the source and relay transmit powers to maximize the energy efficiency (EE) for both amplify-and-forward (AF) and
Zhenyao He +3 more
doaj +1 more source
Differential transmission for amplify-and-forward Cooperative communications [PDF]
IEEE Signal Processing Letters, 2005 In this letter, we propose a differential amplify-and-forward (AF) transmission scheme for a two-user cooperative communications system. By efficiently combining signals from both direct and relay links, the proposed scheme provides superior performance compared to those of direct transmissions with either differential detection or coherent detection ...
T. Himsoon +2 more
openaire +1 more source
Joint Resource Optimization for Cognitive Sensor Networks with SWIPT-Enabled Relay
Sensors, 2017 Energy-constrained wireless networks, such as wireless sensor networks (WSNs), are usually powered by fixed energy supplies (e.g., batteries), which limits the operation time of networks.
Weidang Lu +4 more
doaj +1 more source
Dual-hop amplify-and-forward multi-relay maximum ratio transmission
Journal of Communications and Networks, 2016 In this paper, the performance of dual-hop multi-relay maximum ratio transmission (MRT) over Rayleigh flat fading channels is studied with both conventional (all relays participate the transmission) and opportunistic (best relay is selected to maximize the received signal-to-noise ratio (SNR)) relaying.
Erdogan, Eylem, Gucluoglu, Tansal
openaire +4 more sources
Wireless Communications and Mobile Computing, 2019 In this paper, we analyze the performance of a full-duplex (FD) amplify-and-forward (AF) relay system with imperfect hardware. Besides the aggregate hardware impairments of the imperfect transceiver, we also consider the impact of residual self ...
Nguyen Ba Cao, X. Tran
semanticscholar +1 more source
Performance of a Cognitive Relay Network under AF Relay Selection Scheme with Imperfect Channel Estimation [PDF]
Radioengineering, 2016 In this paper outage performance of a secondary user (SU) is evaluated under amplify and forward (AF) relay selection scheme with an imperfect channel state information (CSI)while sharing spectrum in an underlay cognitive radio network (CRN).
B. Prasad, S. D. Roy, S. Kundu
doaj
Power allocation and capacity optimization of multi-relay cooperative communication system in tunnel
Gong-kuang zidonghua, 2015 The multi-relay cooperative communication system model in rectangular tunnel based on multimode channel model was established, and the channel capacity calculation formulas of multi-relay cooperative communication system in amplify and forward mode and ...
ZHAI Wenyan +3 more
doaj +1 more source
Multicast Transmissions With Full-Duplex Amplify-and-Forward User Cooperation
IEEE Access, 2020 In order to improve the multicast transmissions, a full-duplex (FD) user cooperation scheme is proposed. In this paper, the transmitter sends the common messages to two FD users, and each user forwards its received signals to its counterpart by amplify ...
Linsong Du, Han Zhang, Chuan Huang
doaj +1 more source
All-Optical Amplify-and-Forward Relaying System for Atmospheric Channels
IEEE Communications Letters, 2012 In this letter, we investigate the performance of a dual-hop free space optical link with an all-optical amplify-and-forward relay. We employ photon counting methodology and derive closed form expressions for the end-to-end signal-to-noise ratio and the outage probability. In our derivations, we consider either full or partial channel state information
Mohammadreza A. Kashani +3 more
openaire +3 more sources
Optimized Amplify-and-Forward Relaying for Vehicular Ad-Hoc Networks
2008 IEEE 68th Vehicular Technology Conference, 2008 Cooperative communication techniques promise the advantages of MIMO (multi-input multi-output) communications for wireless scenarios with single-antenna terminals. In this paper, we investigate the performance of a vehicle-to-vehicle cooperative scheme where another vehicle in the vicinity of the source vehicle acts as a relay. The underlying source-to-
Ilhan, Haci +2 more
openaire +3 more sources