scholarly journals Beamforming with Reduced Complexity in MIMO Cooperative Cognitive Radio Networks

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Mehdi Ghamari Adian
Keyword(s):  
Cognitive Radio ◽  
Cognitive Radio Networks ◽  
Radio Networks ◽  
Transmit Beamforming ◽  
Secondary Users ◽  
Cooperative Cognitive Radio Networks ◽  
Single Antenna ◽  
Antenna Subset Selection ◽  
Cooperative Beamforming ◽  
Reduced Complexity

An approach for beamforming with reduced complexity in MIMO cooperative cognitive radio networks (MIMO-CCRN) is presented. Specifically, a suboptimal approach with reduced complexity is proposed to jointly determine the transmit beamforming (TB) and cooperative beamforming (CB) weight vectors along with antenna subset selection in MIMO-CCRN. Two multiantenna secondary users (SU) constitute the desired link, one acting as transmitter (SU TX) and the other as receiver (SU RX) and they coexist with single-antenna primary and secondary users. Some of single antenna secondary users are recruited by desired link as cooperative relay. The maximization of the achievable rates in the desired link is the objective of this work, provided to interference constraints on the primary users are not violated. The objective is achieved by exploiting transmit beamforming at SU TX, cooperation of some secondary users, and cooperative beamforming. Meanwhile, the costs associated with RF chains at the radio front end at SU RX are reduced. Through simulations, it is shown that better performance in the desired link is attained, as a result of cooperation of SUs.

scholarly journals AN-Aided Transmit Beamforming Design for Secured Cognitive Radio Networks with SWIPT

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Weili Ge ◽  
Zhengyu Zhu ◽  
Zhongyong Wang ◽  
Zhengdao Yuan
Keyword(s):  
Cognitive Radio ◽  
Iterative Algorithm ◽  
Cognitive Radio Networks ◽  
Optimization Design ◽  
Original Problem ◽  
Radio Networks ◽  
Artificial Noise ◽  
Transmit Beamforming ◽  
Transmit Power ◽  
Single Antenna

We investigate multiple-input single-output secured cognitive radio networks relying on simultaneous wireless information and power transfer (SWIPT), where a multiantenna secondary transmitter sends confidential information to multiple single-antenna secondary users (SUs) in the presence of multiple single-antenna primary users (PUs) and multiple energy-harvesting receivers (ERs). In order to improve the security of secondary networks, we use the artificial noise (AN) to mask the transmit beamforming. Optimization design of AN-aided transmit beamforming is studied, where the transmit power of the information signal is minimized subject to the secrecy rate constraint, the harvested energy constraint, and the total transmit power. Based on a successive convex approximation (SCA) method, we propose an iterative algorithm which reformulates the original problem as a convex problem under the perfect channel state information (CSI) case. Also, we give the convergence of the SCA-based iterative algorithm. In addition, we extend the original problem to the imperfect CSI case with deterministic channel uncertainties. Then, we study the robust design problem for the case with norm-bounded channel errors. Also, a robust SCA-based iterative algorithm is proposed by adopting the S-Procedure. Simulation results are presented to validate the performance of the proposed algorithms.

scholarly journals An Energy-Efficient Strategy for Secondary Users in Cooperative Cognitive Radio Networks for Green Communications

2016 ◽  
Vol 34 (12) ◽  
pp. 3195-3207 ◽  
Author(s):  
Jianqing Liu ◽  
Haichuan Ding ◽  
Ying Cai ◽  
Hao Yue ◽  
Yuguang Fang ◽  
...  
Keyword(s):  
Cognitive Radio ◽  
Cognitive Radio Networks ◽  
Energy Efficient ◽  
Radio Networks ◽  
Green Communications ◽  
Secondary Users ◽  
Efficient Strategy ◽  
Cooperative Cognitive Radio Networks

Fair and Efficient Spectrum Splitting for Unlicensed Secondary Users in Cooperative Cognitive Radio Networks

2012 ◽  
Vol 71 (1) ◽  
pp. 299-316 ◽  
Author(s):  
Guopeng Zhang ◽  
Kun Yang ◽  
Jinling Song ◽  
Yanwei Li
Keyword(s):  
Cognitive Radio ◽  
Cognitive Radio Networks ◽  
Radio Networks ◽  
Secondary Users ◽  
Cooperative Cognitive Radio Networks ◽  
Spectrum Splitting

Cross-layer Resource Scheduling in OFDM-based Cooperative Cognitive Radio Networks

2011 ◽  
Vol 33 (7) ◽  
pp. 1556-1560
Author(s):  
Zhong-jun Liu ◽  
You-yun Xu ◽  
Dong-mei Zhang ◽  
Bing Gong
Keyword(s):  
Cognitive Radio ◽  
Cognitive Radio Networks ◽  
Resource Scheduling ◽  
Radio Networks ◽  
Cross Layer ◽  
Cooperative Cognitive Radio Networks
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