scholarly journals A New Relaying Scheme for Cheap Wireless Relay Nodes

2005 ◽  
Author(s):  
R. Khalili ◽  
K. Salamatian
Keyword(s):  
Relay Nodes ◽  
Wireless Relay

Optimization of ARQ Mechanism in Wireless Relay Network

2010 ◽  
Vol 108-111 ◽  
pp. 1290-1295
Author(s):  
Li Fen Wu ◽  
Guang Xi Zhu ◽  
Wei Min Wu
Keyword(s):  
Channel Model ◽  
Relay Network ◽  
Bandwidth Utilization ◽  
Layer Model ◽  
Throughput Time ◽  
Relay Nodes ◽  
Finite State ◽  
Wireless Relay ◽  
Wireless Relay Network ◽  
Uwb Channel

In this paper we do some researches on the ARQ mechanism which provides the probability of involving the relay nodes into the UWB multi-hop network. The ARQ mechanism we designed combines PWMR ARQ and Relay ARQ, which can perform on both the end nodes and relay nodes. Then we make a theoretical analysis of the indoor UWB channel model and give a Finite-state Markov linker layer model. With the simulation results, we can get the conclusion that using ARQ mechanism designed in this paper significant enhances throughput, time delay and bandwidth utilization of the UWB multi-hop network.

scholarly journals Performance Analysis of General Hybrid TSR-PSR Energy Harvesting Protocol for Amplify-and-Forward Half-Duplex Relaying Networks

2018 ◽  
Vol 2 (2) ◽  
pp. 121 ◽  
Author(s):  
Phuong T. Tran ◽  
Tan N. Nguyen ◽  
Miroslav Voznak
Keyword(s):  
Energy Harvesting ◽  
Achievable Rate ◽  
Power Splitting ◽  
Amplify And Forward ◽  
Relay Nodes ◽  
Performance Factors ◽  
Creative Commons ◽  
Transmission Modes ◽  
Received Power ◽  
Wireless Relay

In this paper, we propose a hybrid protocol for energy harvesting in wireless relay networks, which combines the benefits of both time-switching relaying (TSR) and power-splitting relaying (PSR), which are two main protocols for energy harvesting. In TSR, a dedicated harvesting time in each time slot is allocated for energy harvesting, while the remaining time is used for information transmission. In PSR, a portion of received power is split for energy harvesting. TSR can simplify the hardware compared to PSR, but reduce the throughput or achievable rate of the system. Specifically, we conduct a rigorous analysis to derive the closed-form formulas for performance factors of the system. We deliver the analysis results for various transmission modes: instantaneous transmission, delay-limited transmission, and delay-tolerant transmission, which are different from each other on the availability of statistical information about the channels between source and relay nodes. The results are also confirmed by Monte Carlo simulation. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

QoS and Protection of Wireless Relay Nodes Failure Using Network Coding

2011 ◽  
Author(s):  
Basil Saeed ◽  
Perumalraja Rengaraju ◽  
Chung-Horng Lung ◽  
Thomas Kunz ◽  
Anand Srinivasan
Keyword(s):  
Network Coding ◽  
Relay Nodes ◽  
Wireless Relay

Effect of CSI Imperfection on Cognitive Underlay Transmission over Nakagami-m Fading Channel

2015 ◽  
Vol 1 ◽  
pp. 59
Author(s):  
Nguyen Hong Giang ◽  
Vo Nguyen Quoc Bao ◽  
Hung Nguyen-Le
Keyword(s):  
Fading Channels ◽  
System Performance ◽  
Performance Metrics ◽  
Maximal Ratio Combining ◽  
Relay Nodes ◽  
Channel State ◽  
Primary Network ◽  
Secondary Network ◽  
System Designs ◽  
Approximate Expressions

This paper analyzes the performance of a cognitive underlay system over Nakagami-m fading channels, where maximal ratio combining (MRC) is employed at secondary destination and relay nodes. Under the condition of imperfect channel state information (CSI) of interfering channels, system performance metrics for the primary network and for the secondary network are formulated into exact and approximate expressions, which can be served as theoretical guidelines for system designs. To verify the performance analysis, several analytical and simulated results of the system performance are provided under various system and channel settings.

Sum-Rate Optimization Constrained by Consumed Power for Multi- Antenna Non-Regenerative Relay Network

2020 ◽  
Vol 10 (2) ◽  
pp. 143-152 ◽  
Author(s):  
Maryam Alibeigi ◽  
Shahriar S. Moghaddam
Keyword(s):  
Relay Network ◽  
Minimization Algorithm ◽  
Amplify And Forward ◽  
Relay Nodes ◽  
Convex Problem ◽  
Semidefinite Programming Problem ◽  
Total Leakage ◽  
Sum Rate ◽  
Rate Optimization ◽  
Novel Algorithm

Background & Objective: This paper considers a multi-pair wireless network, which communicates peer-to-peer using some multi-antenna amplify-and-forward relays. Maximizing the throughput supposing that the total relay nodes’ power consumption is constrained, is the main objective of this investigation. We prove that finding the beamforming matrix is not a convex problem. Methods: Therefore, by using a semidefinite relaxation technique we find a semidefinite programming problem. Moreover, we propose a novel algorithm for maximizing the total signal to the total leakage ratio. Numerical analyses show the effectiveness of the proposed algorithm which offers higher throughput compared to the existing total leakage minimization algorithm, with much less complexity. Results and Conclusion: Furthermore, the effect of different parameters such as, the number of relays, the number of antennas in each relay, the number of transmitter/receiver pairs and uplink and downlink channel gains are investigated.

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