A degree of cooperative diversity has been achieved with the introduction of relay nodes in
wireless networks. However, such approach suffers from spectral efficiency loss. Therefore …

In this paper, we investigate the performance of different relay selection techniques for
Cognitive Radio Networks (CRN). The network contains a primary transmitter P_T PT, a …

In this paper outage performance of a secondary user (SU) is evaluated under an amplify
and forward (AF) relay selection scheme with an imperfect channel state information (CSI) …

Cooperative communication is regarded as a key technology in wireless networks, including
cognitive radio networks (CRNs), which increases the diversity order of the signal to combat …

Cognitive radio holds great promise as a research area nowadays. By increasing the
spectral efficiency, it is applicable to various areas where spectrum is a rare resource …

Secondary access to the licensed primary spectrum band at the same time as the primary
nodes is generally conditioned on the satisfaction of a Quality-of-Service (QoS) requirement …

This paper proposes a joint clustering relay selection and beamforming method for a more
realistic cooperative cognitive radio network, in which a secondary network of multiple …

In a network with dynamic spectrum access, secondary users equipped with frequency-agile
cognitive radios communicate with one another via spectrum that is not being used by the …

This paper studies the cognitive one-way relay network which is composed of a pair of
primary transmitter and receiver. A two-step one-way amplify-and-forward (AF) relaying …

The performance of the best relay selection on the decode-and-forward (DF) mode cognitive
radio relay networks is studied. Some important factors, such as the outage probability, the …