In this paper, we propose a spectrum allocation framework that jointly considers the Quality-
of-Service (QoS) provisioning for heterogeneous secondary Real-Time (RT) and Non-Real …

The author presents a unified treatment of this highly interdisciplinary topic to help define the
notion of cognitive radio. The book begins with addressing issues such as the fundamental …

We study the resource-allocation problem in a multiuser orthogonal frequency-division
multiplexing (OFDM)-based cognitive radio (CR) system using a cross-layer approach. The …

This paper considers channel and power allocation for cognitive radio (CR) networks. We
assume that the total available spectrum is divided into several bands, each consisting of a …

(57) ABSTRACT A method includes obtaining data to be transmitted wirelessly and
detecting if any transmitting devices having a higher priority are currently using at least one …

The resource allocation problem on the downlink of a multiuser OFDM-based cognitive radio
(CR) system is formulated using a cross-layer (MAC and PHY layers) approach with the aim …

High data rate wireless access is demanded by many applications. Usually, more bandwidth
is required for higher data rate transmission in any of the system. With promising technology …

Guaranteeing Quality of Service (QoS) in Cognitive Radio (CR) networks is a challenging
task due to the random nature of radio channel conditions and primary user traffic. In this …

In this paper, a simple and effective synchronization scheme for NC-OFDM systems is
proposed. To keep the autocorrelation in the scenario of subcarriers deficiency, the …

As a primary way of data transmission in a large variety of cognitive radio systems, Non-
Contiguous Orthogonal Frequency Division Multiplexing (NC-OFDM) is a specialized OFDM …