Joint power allocation and beamforming with users selection for cognitive radio networks via discrete stochastic optimization

2012 ◽  
Vol 18 (5) ◽  
pp. 481-493 ◽  
Author(s):  
Renchao Xie ◽  
F. Richard Yu ◽  
Hong Ji
Keyword(s):  
Cognitive Radio ◽  
Stochastic Optimization ◽  
Power Allocation ◽  
Cognitive Radio Networks ◽  
Radio Networks ◽  
Joint Power ◽  
Selection For ◽  
Discrete Stochastic Optimization

Joint Power Allocation and Relay Selection Optimization for Cognitive Radio Networks

2013 ◽  
Vol 791-793 ◽  
pp. 1153-1159
Author(s):  
Li Ping Su ◽  
Dong Chen ◽  
Wei Hua Huang ◽  
Ning Li
Keyword(s):  
Cognitive Radio ◽  
Power Allocation ◽  
Cognitive Radio Networks ◽  
Relay Selection ◽  
Radio Networks ◽  
System Capacity ◽  
System Throughput ◽  
Joint Power ◽  
Selection Scheme ◽  
Multiple User

This paper investigates the joint power allocation (PA) and relay selection scheme (RS) in two-way relaying cognitive radio networks consisting of multiple user-pairs and multiple relays. In order to reduce the computational complexity for practical scenario, we propose a branch and bound based (BnB-based) power allocation and relay selection scheme and a greedy power allocation and relay selection scheme to maximize the system throughput. The system is assumed under the constraint that the interference power from the secondary nodes in two way relay systems to primary user (PU) shall be less than a predefined interference threshold which can guarantee the normal communication of PU. Numerical simulation results show that the optimal PA and RS scheme has the highest system capacity, however, the greedy PA and RS scheme has the lowest complexity. The proposed BnB-based PA and RS scheme has the better tradeoff of system throughput and complexity than the above two schemes.

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