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ICASSP
2009
IEEE
13 years 10 months ago
Beacon-assisted spectrum access with cooperative cognitive transmitter and receiver
—Spectrum access is an important function of cognitive radios for detecting and utilizing spectrum holes without harming the legacy systems. In this paper, we propose novel coope...
Ali Tajer, Xiaodong Wang
CISS
2008
IEEE
13 years 10 months ago
Sum transmission power of multiple cooperative secondary transmitters in dynamic spectrum access networks
Cognitive radio is a desirable technique for secondary users to utilize the spectrum gray space. In order to avoid intolerable interference to primary users, the transmission powe...
Juite Hwu, Jinying Chen, Xiaohua Li
GLOBECOM
2008
IEEE
13 years 10 months ago
Collaborative Opportunistic Spectrum Access in the Presence of Multiple Transmitters
Abstract— We present a collaborative algorithm to enable opportunistic spectrum access for cognitive radios in the presence of multiple co-channel transmitters. A spectrum hole d...
Ahmed O. Nasif, Brian L. Mark
ITIIS
2010
191views more  ITIIS 2010»
13 years 2 months ago
Cooperative Multi-relay Scheme for Secondary Spectrum Access
In this paper, we propose a cooperative multi-relay scheme for a secondary system to achieve spectrum access along with a primary system. In the primary network, a primary transmi...
Tran Trung Duy, Hyung Yun Kong
CORR
2010
Springer
248views Education» more  CORR 2010»
13 years 3 months ago
Optimal Spectrum Sharing in MIMO Cognitive Radio Networks via Semidefinite Programming
Abstract--In cognitive radio (CR) networks with multipleinput multiple-output (MIMO) links, secondary users (SUs) can exploit "spectrum holes" in the space domain to acce...
Ying Jun Zhang, Anthony Man-Cho So