This paper deals with the problem of aggregated interference generated by multiple
cognitive radios (CRs) at the receivers of primary (licensed) users. In particular, we consider …

This work on cognitive radio access ventures beyond the more traditional" listen-before-talk"
paradigm that underlies many cognitive radio access proposals. We exploit the bi-directional …

An Aloha-like spectrum access scheme without negotiation is considered for multiuser and
multichannel cognitive radio systems. To avoid collisions incurred by the lack of …

The increasing demand for the radio spectrum along with the inefficient usage of the
licensed bands has led the regulatory bodies to consider opening up the under-utilized …

In this paper we investigate the problem of spectrally efficient operation of a cognitive radio
(CR), also called secondary system (SS), under an interference from the primary system …

Cognitive Radio (CR) enables an unlicensed user to change its transmission and reception
parameters adaptively according to spectrum availability in a wide range of licensed …

Cognitive radio methodologies have the potential to dramatically increase the throughput of
wireless systems. Herein, control strategies which enable the superposition in time and …

Wireless cognitive radio (CR) is a newly emerging paradigm that attempts to
opportunistically transmit in licensed frequencies, without affecting the pre-assigned users of …

Resource allocation is an important issue in cognitive radio systems. It can be done by
carrying out negotiation among secondary users. However, significant overhead may be …

Interference alignment (IA) is a promising technique that can eliminate interference in
wireless networks effectively and has been applied to spectrum sharing in cognitive radio …