scholarly journals Joint User and Relay Selection based Cooperative NOMA with Imperfect CSI

2020 ◽  
Vol 19 ◽  
Keyword(s):  
Relay Selection ◽  
Relay Node ◽  
Imperfect Csi ◽  
Amplify And Forward ◽  
Relay Nodes ◽  
Outage Performance ◽  
Partial Relay Selection ◽  
Rate Capacity ◽  
Stable Performance ◽  
The Impact

In this paper we consider the deployment of mobile relay nodes in a Cooperative Non Orthogonal Multiple Access (CNOMA) system with variable gain Amplify and Forward relaying. In a multiuser downlink scenario, two users are chosen as the NOMA destination pairs based on the channel quality and another suitable user is chosen to act as the relay node. Two standard relay selection protocols are examined here viz. the partial relay selection (PRS) and optimal relay selection (ORS). An outdated channel condition induced by the user mobility condition is considered in this paper and the impact of channel correlation on the system performance is analyzed. The outage performance and ergodic sum rate capacity of the users is observed under the two relay selection schemes. Further, the impact of user node velocity on the relay selection and outage performance have been reported. It is observed that the optimal relay selection has an overall better performance compared to partial relay selection. However, the impact of user velocity and time delay is lesser in case of partial relay selection. Hence, partial relay selection method has a more stable performance in case of imperfect CSI compared to optimal relay selection.

scholarly journals On the Performance of Power Splitting Energy Harvested Wireless Full-Duplex Relaying Network with Imperfect CSI over Dissimilar Channels

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Tan N. Nguyen ◽  
Minh Tran ◽  
Phuong T. Tran ◽  
Phu Tran Tin ◽  
Thanh-Long Nguyen ◽  
...  
Keyword(s):  
System Performance ◽  
Estimation Error ◽  
Relay Node ◽  
Full Duplex ◽  
Channel Estimation Error ◽  
Power Splitting ◽  
Imperfect Csi ◽  
Amplify And Forward ◽  
Relay Nodes ◽  
Splitting Factor

The energy harvesting amplify-and-forward full-duplex relaying network over the dissimilar fading environments in imperfect CSI condition is investigated. In this system model, the energy, and information are transferred from the source to the relay nodes by the power splitting protocol with helping of the full-duplex relay node. Firstly, the outage probability, achievable throughput, and the optimal power splitting factor in terms of the analytical mathematical expressions were proposed, analyzed, and demonstrated. Furthermore, the system performance of the proposed model on the connection with all system parameters is rigorously studied. Finally, the numerical results demonstrated and convinced one that the analytical and the simulation results are matched well with each other for all system parameter values using Monte-Carlo simulation. The results show that the system performance degrades significantly but is still in a permissible interval while the channel estimation error increases and the system performance of the mixing scenarios is better in comparison with the Rayleigh-Rayleigh scenario.

scholarly journals Evaluation of PLC Channel Capacity and ABER Performances for OFDM-Based Two-Hop Relaying Transmission

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Sana Ezzine ◽  
Fatma Abdelkefi ◽  
Jean Pierre Cances ◽  
Vahid Meghdadi ◽  
Ammar Bouallégue
Keyword(s):  
Channel Capacity ◽  
Orthogonal Frequency Division Multiplexing ◽  
Low Cost ◽  
Relay Node ◽  
Destination Node ◽  
Direct Link ◽  
Amplify And Forward ◽  
Decode And Forward ◽  
Maximum Ratio Combining ◽  
The Impact

Powerline network is recognized as a favorable infrastructure for Smart Grid to transmit information in the network thanks to its broad coverage and low cost deployment. The existing works are trying to improve and adapt transmission techniques to reduce Powerline Communication (PLC) channel attenuation and exploit the limited bandwidth to support high data rate over long distances. Two-hop relaying BroadBand PLC (BB-PLC) system, in which Orthogonal Frequency Division Multiplexing (OFDM) is used, is considered in this paper. We derive and compare the PLC channel capacity and the end-to-end Average BER (ABER) for OFDM-based direct link (DL) BB-PLC system and for OFDM-based two-hop relaying BB-PLC system for Amplify and Forward (AF) and Decode and Forward (DF) protocols. We analyze the improvements when we consider the direct link in a cooperative communication when the relay node only transmits the correctly decoded signal. Maximum ratio combining is employed at the destination node to detect the transmitted signal. In addition, in this paper, we highlight the impact of the relay location on the channel capacity and ABER for AF and DF transmission protocols. Moreover, an efficient use of the direct link was also investigated in this paper.

Semi-blind amplify-and-forward with partial relay selection

2009 ◽  
Vol 45 (6) ◽  
pp. 317 ◽  
Author(s):  
H.A. Suraweera ◽  
D.S. Michalopoulos ◽  
G.K. Karagiannidis
Keyword(s):  
Relay Selection ◽  
Amplify And Forward ◽  
Partial Relay Selection

scholarly journals Outage Performance of Bidirectional Full-Duplex Amplify-and-Forward Relay Network with Transmit Antenna Selection and Maximal Ratio Combining

2018 ◽  
Vol 1 ◽  
pp. 62-69
Author(s):  
R. Rajesh ◽  
P. G. S. Velmurugan ◽  
S. J. Thiruvengadam ◽  
P. S. Mallick
Keyword(s):  
Antenna Selection ◽  
Relay Node ◽  
Maximal Ratio Combining ◽  
Full Duplex ◽  
Relay Network ◽  
Amplify And Forward ◽  
Transmit Antenna Selection ◽  
Outage Performance ◽  
Half Duplex ◽  
Af Relay

In this paper, a bidirectional full-duplex amplify- and-forward (AF) relay network with multiple antennas at source nodes is proposed. Assuming that the channel state information is known at the source nodes, transmit antenna selection and maximal ratio combining (MRC) are employed when source nodes transmit information to the relay node and receive information from the relay node respectively, in order to improve the overall signal-to-interference plus noise ratio (SINR). Analytical expressions are derived for tight upper bound SINR at the relay node and source nodes upon reception. Further, losed form expressions are also derived for end-to-end outage probability of the proposed bidirectional full-duplex AF relay network in the Nakagami-m fading channel environment. Although self-interference at the relay node limits the performance of the full-duplex network, the outage performance of the proposed network is better than that of conventional bidirectional full-duplex and half-duplex AF relay networks, due to the selection diversity gain in TAS and diversity and array gain in MRC.

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