In oceans, both the natural acoustic systems (such as marine mammals) and artificial
acoustic systems [like underwater acoustic networks (UANs) and sonar users] use acoustic …

Spectrum frequency is a valuable resource for wireless communication but very limited in its
availability. Due to the extensive use and ever increasing demand of spectrum bands by …

Resources in cognitive radio networks (CRNs) should dynamically be allocated according to
the sensed radio environment. Although some work has been done for dynamic resource …

Femtocell is envisioned as a highly promising solution for indoor wireless communications.
The spectrum allocated to femtocells is traditionally from the same licensed spectrum bands …

In this paper we study the resource allocation in multiuser orthogonal frequency division
multiplexing (OFDM)-based cognitive radio (CR) networks, where secondary users (SUs) …

Cognitive acoustic (CA) is emerging as a promising technique for environment-friendly and
spectrum-efficient underwater communications. Due to the unique features of underwater …

This paper presents a joint subcarrier and power allocation algorithm for cooperative
multiuser orthogonal frequency division multiplexing (MU-OFDM) cognitive radio (CR) …

Cognitive radio (CR) technology helps mitigate wireless resource scarcity problem by
dynamically changing frequency spectrum, power and modulation type. Opportunistic …

This paper considers a cognitive radio (CR) network comprising one cognitive base station
(CBS) and a number of secondary users (SUs) that shares a set of channels with a primary …

To maximize the limited spectrum among primary users and cognitive Internet of Things (IoT)
users as we save the limited power and energy resources available, there is a need to …