scholarly journals Optimal Power Splitting for Simultaneous Wireless Information and Power Transfer in Amplify-and-Forward Multiple-Relay Systems

IEEE Access ◽  
2018 ◽  
Vol 6 ◽  
pp. 3459-3468 ◽  
Author(s):  
Derek Kwaku Pobi Asiedu ◽  
Sumaila Mahama ◽  
Sang-Woon Jeon ◽  
Kyoung-Jae Lee
Keyword(s):  
Power Splitting ◽  
Power Transfer ◽  
Amplify And Forward ◽  
Relay Systems ◽  
Optimal Power ◽  
Multiple Relay

scholarly journals Layered Capacity-Based Relay-and-Antenna Joint Selection for MIMO-AF-Multiple-Relay Systems in Correlated Channels

2012 ◽  
Vol 2012 ◽  
pp. 1-9
Author(s):  
Chia-Chang Hu ◽  
Jheng-Siang Li ◽  
Bo-Liang Wu
Keyword(s):  
Fading Channels ◽  
Channel Capacity ◽  
Antenna Selection ◽  
Selection Strategy ◽  
Destination Node ◽  
Hardware Complexity ◽  
Amplify And Forward ◽  
Relay Systems ◽  
Capacity Maximization ◽  
Multiple Relay

A computationally efficient two-stage greedy capacity maximization (GCM) relay-and-antenna joint selection is proposed for a dual-hop nonregenerative amplify-and-forward (AF) multiple-input multiple-output (MIMO) multiple-relay system with multiple antennas equipped at each node in correlated fading channels. This modified GCM (MGCM) antenna selection strategy selects a subset of antenna pairs from available relays based on the concept of channel capacity maximization subject to an optimal power allocation constraint across the activated antenna pairs. In order to reduce system hardware complexity, antenna selection schemes are performed at the destination node as well. Finally, simulations are conducted to compare the channel capacity of the proposed two-layered antenna selection technique with other existing antenna selection algorithms for half-duplex AF-MIMO multiple-relay systems.

The Diversity Gains of Amplify-and-Forward Relay System with Frequency Selective Channels

2014 ◽  
Vol 644-650 ◽  
pp. 4297-4302
Author(s):  
Y.H. Ding ◽  
R.J. Tian ◽  
K. Xue ◽  
Y. Tian ◽  
X.C. Wang ◽  
...  
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Amplify And Forward ◽  
Relay System ◽  
Relay Systems ◽  
Frequency Selective ◽  
Multiple Relay ◽  
Frequency Selective Channels ◽  
Diversity Gains

The diversity gains of amplify-and-forward (AF) relay system with frequency selective channels are discussed. The orthogonal frequency division multiplexing (OFDM) is applied to overcome the inter-symbol interference. The diversity gains are presented for single and multiple relay systems with detailed derivations.

Examination of the fifth-generation vehicular simultaneous wireless information and power transfer cooperative non-orthogonal multiple access network in military scenarios considering time-varying and imperfect channel state information conditions

2021 ◽  
pp. 154851292110330
Author(s):  
Sharnil Pandya ◽  
Patteti Krishna ◽  
Ravi Shankar ◽  
Ankur Singh Bist
Keyword(s):  
Wireless Communication ◽  
Communication Systems ◽  
Multiple Access ◽  
Ad Hoc ◽  
Access Network ◽  
Power Splitting ◽  
Power Transfer ◽  
Amplify And Forward ◽  
Decode And Forward ◽  
Fifth Generation

In a defense scenario, the communicating nodes are mobile and, due to this, the fading channel links become time selective in nature. Non-orthogonal multiple access (NOMA) is a promising technique in modern wireless communication systems, and it is employed in a variety of defense ad hoc wireless communication scenarios where nodes are mobile and it is difficult to estimate the channel coefficients perfectly. NOMA contributes to increased spectral efficiency (SE), firstly by enabling fifth-generation new radio deployment in the 3.5 GHz frequency range, and secondly by employing a simultaneous wireless information and power transfer (SWIPT) time switching and power splitting-based cooperative NOMA (C-NOMA) network where simple radio frequency circuitry is used for energy harvesting. NOMA together with the selective decode-and-forward (S-DF) protocol will increase the SE and energy efficiency simultaneously. The outage probability performance is evaluated for various values of the fading severity parameter and node velocity forming the channel error. It is significant to note that digital S-DF-based SWIPT C-NOMA performs much better than an analog amplify-and-forward-based C-NOMA SWIPT system.

scholarly journals Simultaneous Wireless Information and Power Transfer Mechanism in Interference Alignment Relay Networks

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Fahui Wu ◽  
Lin Xiao ◽  
Dingcheng Yang ◽  
Laurie Cuthbert ◽  
Xiaoping Liu
Keyword(s):  
Energy Source ◽  
System Performance ◽  
Interference Alignment ◽  
Relay Networks ◽  
Power Splitting ◽  
Power Transfer ◽  
Relay Nodes ◽  
Relay System ◽  
Relay Systems ◽  
New Energy

This paper considers a simultaneous wireless information and power transfer (SWIPT) mechanism in an interference alignment (IA) relay system, in which source nodes send wireless information and energy simultaneously to relay nodes, and relay nodes forward the received signal to destination nodes powered by harvested energy. To manage interference and utilize interference as energy source, two-SWIPT receiver is designed, namely, power splitting (PS), and antennas switching (AS) has been considered for relay system. The performance of AS- and PS-based IA relay systems is considered, as is a new energy cooperation (ECop) scheme that is proposed to improve system performance. Numerical results are provided to evaluate the performance of all schemes and it is shown from the simulations that the performance of proposed ECop outperformed both AS and PS.

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