Spectrum bands are the backbone of wireless networks. Every user is allocated a fraction of
the spectrum from available fixed spectrum band. But, the fixed available spectrum band …

Cognitive radio (CR) is a new paradigm that utilizes the available spectrum band. The key
characteristic of CR system is to sense the electromagnetic environment to adapt their …

With the implementation of channel assembling (CA) techniques, higher data rate can be
achieved for secondary users in multi-channel cognitive radio networks. Recent studies …

Cognitive radio networks (CRNs) are an emerging paradigm for next generation wireless
communication systems allowing for more efficient radio spectrum utilization. In order to …

A cognitive network makes use of the information gathered from the network in order to
sense the environment, plan actions according to the input, and make appropriate decisions …

Today's wireless networks are characterized by fixed spectrum assignment policy. The
limited available spectrum and the inefficiency in the spectrum usage necessitate a new …

The transmission times with generally random distributed for both primary user (PU) and
secondary user (SU) in a cognitive radio system with a single PU band is investigated. To …

Wireless networks are characterized by fixed spectrum policy. With increasing demands for
wireless communication efficiently using the spectrum resources has become an essential …

Abstract Cognitive Radio Network is an emerging popular wireless network, designed for
efficient spectrum utilization. It enables unlicensed users to access the unused portion of the …

In cognitive radio networks, the packet transmissions of the secondary users (SUs) can be
interrupted randomly by the primary users (PUs). That is to say, the PU packets have …