Cognitive radio is considered as a very influencing technique and has the great potential to
solve the problem of shortage of the radio spectrum. A secondary user also called as a …

Cognitive Radio has emerged as a promising technology to improve the spectrum utilization
efficiency and overcome spectrum scarcity problem by performing an opportunistic access to …

Cognitive radio (CR) is a rising technology that unlocks the doors for radio spectrum scarcity
problem, which is of great concern nowadays among the researchers at various levels. CR …

In wireless communication system, the radio spectrum is one of the biggest resource
constraints with limited availability in nature. To regulate the use of this limited resource …

Radio spectrum is the backbone for wireless communication. Many recent studies show that
most of the available spectrum has already been allocated. Cognitive radio (CR) provides a …

Spectrum scarcity and effective utilization of the available spectrum is still a challenge in
wireless communication. Due to static spectrum allocation (DSA) policy most of the spectrum …

Spectrum utilization, as a current hot research topic, has been paid extensive attention to in
cognitive wireless networks. However, due to the complexities and dynamic properties in …

The rapid growth in wireless communications has contributed to a huge demand on the
deployment of new wireless services in both the licensed and unlicensed frequency …

ABSTRACT A basic problem facing the future in wireless systems is where to find suitable
spectrum bands to fulfill the demand of future services. While all of the radio spectrum is …

In Cognitive radio networks, spectrum sensing is one of the major issues for dynamic
spectrum access. The physical layer senses the spectrum availability of the primary users …