In the past decade, cognitive radio and cooperative communication techniques have been
proposed in the literature for efficiently utilizing the radio resources. Cognitive radio is an …

In this paper, we present simple opportunistic relaying with decode-and-forward (DaF) and
amplify-and-forward (AaF) strategies under an aggregate power constraint. In particular, we …

In the present scenario, an energy efficiency has become a matter of prime importance for
wireless networks. To meet the demands of an increased capacity, an improved data rate …

This paper is on relay selection schemes for wireless relay networks. First, we derive the
diversity of many single-relay selection schemes in the literature. Then, we generalize the …

This paper considers a wireless cooperative cellular data network with a base station and
many subscribers in which the subscribers have the ability to relay information for each other …

This paper deals with beamforming in wireless relay networks with perfect channel
information at the relays, receiver, and transmitter if there is a direct link between the …

Cooperative communications have been proposed to exploit the spatial diversity gains
inherent in multiuser wireless systems without the need of multiple antennas at each node …

We consider a two-hop MIMO-OFDM communication scheme with a source, an amplify-and-
forward relay, and a destination. We examine the possibilities of power allocation (PA) over …

In this manuscript, we propose an alternating optimization framework to maximize the
energy efficiency of a backscatter-enabled cooperative Non-orthogonal multiple access …

In this paper, we propose a relay selection amplify-and-forward (RS-AF) protocol in general
bidirectional relay networks with two sources and N relays. In the proposed scheme, the two …