The upcoming sixth generation (6G) communications systems are expected to support an
unprecedented variety of applications, pervading every aspect of human life. It is clearly not …

In order to perform reliable communications, a system needs to have sufficient information
about its operational environment, such as spectral resources and propagation …

This paper studies joint beamforming and power control in a coordinated multicell downlink
system that serves multiple users per cell to maximize the minimum weighted signal-to …

Satellites extend the 5G Internet of Things (IoT) applications to remote areas by providing
global coverage. In applications like environmental and wildlife monitoring, the location …

5G enables a wide variety of wireless communications applications and use cases. There
are different requirements associated with the applications, use cases, channel structure …

There has been significant research progress reported over the last few years in the
development of cognitive radio technologies. This paper reviews some of these results …

Location awareness is one of the essential characteristics of cognitive radios. In this paper,
an innovative cognitive positioning system (CPS) that achieves accuracy adaptation in both …

The cognitive radio network (CRN), as a promising technique in future wireless
communication networks, shall execute some critical functionalities to enhance existing …

Source localization of primary users (PUs) is a spectrum awareness feature that can be very
useful in enhancing the functionality of cognitive radios (CRs). When the cooperating CRs …

As an initial step toward solving the spectrum-shortage problem, the Federal
Communications Commission (FCC) has started the so-called opportunistic spectrum …