scholarly journals Amplify-and-Forward Gateway With Zero-Forcing in Multiuser Environments

2017 ◽  
Vol 66 (6) ◽  
pp. 4954-4966 ◽  
Author(s):  
Abdurrahman Alfitouri ◽  
Khairi Ashour Hamdi
Keyword(s):  
Amplify And Forward ◽  
Zero Forcing ◽  
Multiuser Environments

scholarly journals Energy-Efficient Dual-Iteration Power Allocation for Two-Phase Relay System with Massive Antennas

2014 ◽  
Vol 2014 ◽  
pp. 1-8
Author(s):  
Long Zhao ◽  
Wei Xiang ◽  
Jie Mei ◽  
Hui Zhao ◽  
Hang Long ◽  
...  
Keyword(s):  
Power Allocation ◽  
Relay Node ◽  
Spectrum Efficiency ◽  
Amplify And Forward ◽  
Zero Forcing ◽  
Channel State ◽  
Relay System ◽  
Two Phase ◽  
Massive Antennas ◽  
Equal Power Allocation

This paper considers the scenario where multiple source nodes communicate with multiple destination nodes simultaneously with the aid of an amplify-and-forward relay equipped with massive antennas. In order to achieve optimal energy efficiency (EE) of the entire relay system, this paper investigates the power allocation problem for the multiple pairs of nodes at both the source nodes and the relay node, where the relay employs the backward and forward zero-forcing filters. Since the EE optimization problem cannot be solved analytically, we propose a two-phase power allocation method. Given power allocation of one phase, the optimal power allocation is derived for the other phase. Furthermore, two dual-iteration power allocation (DIPA) algorithms with performance approaching that of optimal EE are developed based on the instantaneous and statistic channel state information, respectively. Numerical results show that the proposed DIPA algorithms can greatly improve EE while guaranteeing spectrum efficiency (SE) when compared with the equal power allocation algorithm. Moreover, both algorithms suggest that deploying a rational number of antennas at the relay node and multiplexing a reasonable number of node pairs can improve on the EE and SE.

Distributed Zero-Forcing Amplify-and-Forward Beamforming for WSN Operation in Interfered and Highly Scattered Environments

2020 ◽  
Vol 68 (2) ◽  
pp. 1187-1199 ◽  
Author(s):  
Slim Zaidi ◽  
Oussama Ben Smida ◽  
Sofiene Affes ◽  
Shahrokh Valaee
Keyword(s):  
Amplify And Forward ◽  
Zero Forcing

Multi-Way MIMO Amplify-and-Forward Relay Networks with Zero-Forcing Transmission

2013 ◽  
Vol 61 (12) ◽  
pp. 4847-4863 ◽  
Author(s):  
Gayan Amarasuriya ◽  
Chintha Tellambura ◽  
Masoud Ardakani
Keyword(s):  
Relay Networks ◽  
Amplify And Forward ◽  
Zero Forcing

Zero Forcing Beamforming Based Coordinated Scheduling Algorithm for Downlink Coordinated Multi-Point Transmission System

2015 ◽  
Vol E98.B (2) ◽  
pp. 352-359 ◽  
Author(s):  
Ping WANG ◽  
Lei DING ◽  
Huifang PANG ◽  
Fuqiang LIU ◽  
Nguyen Ngoc VAN
Keyword(s):  
Scheduling Algorithm ◽  
Transmission System ◽  
Zero Forcing ◽  
Coordinated Scheduling
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