Spectrum sensing is an important functional unit of the cognitive radio networks. The spectrum sensing is one of the main challenges encountered by cognitive radio. This paper presents a survey of spectrum sensing techniques and they are studied from a cognitive radio perspective. The challenges that go with spectrum sensing are reviewed. Two sensing schemes, namely; cooperative sensing and eig...

With the constant advances in cognitive radio technology, there is a developing need for proper testing facilities. This paper introduces efforts to bring together research and development of cognitive radio, dynamic spectrum access (DSA), and software defined radio systems to enable testing in real-world environments, and to develop applications for these emerging systems. Using licensed test ...

Nowadays, the radio resources and particularly the spectrum are considered a very precious resource as spectrum is limited and according to some research it has been found that only few percentages of spectrum is being utilized and rest of the spectrum get wasted, due to this fact a considerable research has been conducted recently for finding suitable and efficient ways to use the radio spectr...

OSCR, a framework for the implementation of a cognitive radio, is designed to facilitate the integration of a cognitive engine with one or more existing Software Communications Architecture (SCA) based radios. It consists of two components: a multiplexer, which acts as the cognitive engine’s point of control for each individual radio within the system, and an SCA resource within each radio, whi...

In this paper we propose a cloud based interweave cognitive radio HetNets which combines gain of cloud based radio that is increased rate for cell edge users and better spectral efficiency of cognitive radio. Simulation results for limited feedback shows approximately 100 % increase in rate for primary while 300 % for secondary cell edge users with same outage in cloud over conventional cogniti...

-The future of Wireless Communication Technology is going to be basically based on Cognitive Radio (CR) or Intelligent Radio (IR). At present the Spectrum allocation governed by the government agencies or the service providers who are in need of more spectrums, to manage the increasing frequency demands from the end users as the technological improvement increases exponentially. Efficient utili...

Cognitive Radio (CR) is an intelligent radio that can dynamically access the radio spectrum. Secondary users in Cognitive Radio Network (CRN) can access the licensed spectrum without causing harmful interference to primary users. The performance of cognitive radio networking functionalities depends on the properties of the spectrum band in use. This necessitates a crosslayer design in the entir...

Cognitive radio is a communication technology which is designed to serve users to make use of the available bandwidth in a greatest possible amount. Though more research has been done on spectrum sensing and allocation problems, cognitive radio has recently attracted a lot of research interest. This paper shows the concept of cognitive radio networks (CRNs). Cognitive radio is an intelligent fo...