Cognitive radio (CR) design aims to increase spectrum utilization by allowing the secondary
users (SUs) to coexist with the primary users (PUs), as long as the interference caused by …

We examine the impact of limited channel knowledge on the secondary user (SU) in a
cognitive radio system. Under a minimum signal-to-interference noise ratio (SINR) constraint …

Cognitive radio (CR) has been considered as a promising technology to improve the
spectrum utilization. In this paper we analyze the capacity of a CR network with average …

A spectrum-sharing communication system where the secondary user is aware of the
instantaneous channel-state information (CSI) of the secondary link but knows only the …

In this paper, we consider a cognitive radio (CR) network where a secondary (cognitive)
user shares the spectrum for transmission with a primary (non-cognitive) user over block …

In this paper, we analyze the capacity gains of opportunistic spectrum-sharing channels in
fading environments with imperfect channel information. In particular, we consider that a …

In this paper, the performance of cognitive radio systems is studied when the secondary
users operate under statistical quality of service (QoS) constraints. In the cognitive radio …

Spectrum sharing has attracted a lot of attention in cognitive radio recently as an effective
method of alleviating the spectrum scarcity problem by allowing unlicensed users to coexist …

Cognitive radio (CR) systems improve the spectral efficiency by allowing the coexistence in
harmony of primary users (PUs), the legacy users, with secondary users (SUs). This …

This paper considers a spectrum sharing based cognitive radio (CR) communication system,
which consists of a secondary user (SU) having multiple transmit antennas and a single …