Abstract Much interest in Cognitive Radio Networks (CRNs) has been raised recently by
enabling unlicensed (secondary) users to utilize the unused portions of the licensed …

Cooperative Communications in Cognitive Radio (CR) have been introduced as an
essential and efficient technique to improve the transmission performance of primary users …

Public regulatory agencies have traditionally assigned radio-electric spectrum in a static
way. This has led to an almost fully assigned but sparsely and unevenly used spectrum, in …

Cognitive radio technology has been proposed to improve spectrum utilization by sharing
the frequency spectrum bands between licensed and unlicensed users, called primary users …

Cognitive radio networks (CRNs), which allow secondary users (SUs) to dynamically access
a network without affecting the primary users (PUs), have been widely regarded as an …

Cooperative Spectrum Sharing (CSS) is an appealing approach for primary users (PUs) to
share spectrum with secondary users (SUs) because it increases the transmission range or …

Spectrum leasing has been widely regarded as one of the most effective ways to improve
the utilization of limited spectrum resources. In this paper, we propose a novel traffic …

Over the past years, ray tracing (RT) models popularity has been increasing. From the
nineties, RT has been used for field prediction in environment such as indoor and urban …

The research has been conducted in a railway scenario to leverage on current Public
Network based on radio frequency technology instead of a wired Private Network to serve …

Cognitive radio (CR) is the next-generation wireless communication system that has been
proposed to address spectrum scarcity in the traditional static spectrum assignment policy …