Performance Analysis of Cognitive Radio Relay Networks Using Decode and Forward Selection Relaying over Rayleigh Fading Channels

2011 ◽  
Author(s):  
A. A. Alkheir ◽  
M. Ibnkahla
Keyword(s):  
Cognitive Radio ◽  
Performance Analysis ◽  
Fading Channels ◽  
Rayleigh Fading ◽  
Relay Networks ◽  
Rayleigh Fading Channels ◽  
Forward Selection ◽  
Decode And Forward

Exact Ergodic Capacity Analysis for Cognitive Underlay Amplify-and-Forward Relay Networks over Rayleigh Fading Channels

2017 ◽  
Author(s):  
Vo Nguyen Quoc Bao ◽  
Vu Van San
Keyword(s):  
Fading Channels ◽  
Rayleigh Fading ◽  
Relay Networks ◽  
Ergodic Capacity ◽  
Closed Form Expression ◽  
Rayleigh Fading Channels ◽  
Capacity Analysis ◽  
Amplify And Forward ◽  
Form Expression ◽  
Decode And Forward

In this paper, we propose a novel derivation approach to obtain the exact closed form expression of ergodic capacity for cognitive underlay amplify-and-forward (AF) relay networks over Rayleigh fading channels. Simulation results are performed to verify the analysis results. Numerical results are provided to compare the system performance of cognitive underlay amplify-and-forward relay networks under both cases of AF and decode-and-forward (DF) confirming that the system with DF provides better performance as compared with that with AF. DOI: 10.32913/rd-ict.vol3.no14.563

scholarly journals Multihop Decode-and-Forward Relay Networks: Secrecy Analysis and Relay Position Optimization

2012 ◽  
Vol 2 (1-2) ◽  
Author(s):  
Vo Nguyen Quoc Bao ◽  
Nguyen Linh-Trung
Keyword(s):  
Fading Channels ◽  
Performance Measures ◽  
Rayleigh Fading ◽  
Optimization Problem ◽  
Relay Networks ◽  
Rayleigh Fading Channels ◽  
Secrecy Capacity ◽  
Direct Transmission ◽  
Network Resources ◽  
Decode And Forward

Relay communication has advantages over direct transmission in terms of secrecy capacity. In this paper, the performance of secrecy, offered by multihop decode-and-forward relaying, is investigated and compared to its counterpart in direct transmission. Three key performance measures are derived over Rayleigh fading channels: probability of non-zero secrecy capacity, secure outage probability and secrecy capacity, which are valid for an arbitrary number of hops. Based on the tractable form of the probability of non-zero secrecy capacity, the optimization problem of trusty relay replacement is also studied. Numerical results indicate that a proper relay replacement can increase the network security without extra network resources. The correctness of analytical results is confirmed by using a MATLAB-based independent simulation model.

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