A Study on Spectral Efficiency of Physical Layer over Cognitive Radio

TL;DR

This paper investigates the spectral efficiency of cognitive radio's physical layer, exploring mechanisms like adaptive modulation and MIMO, and evaluates cross-layer performance gains in wireless networks.

Contribution

It provides a practical analysis of spectral efficiency improvements in cognitive radio physical layers and examines cross-layer design issues.

Findings

Spectral efficiency gains achieved through adaptive modulation and MIMO.

Cross-layer integration enhances cognitive radio performance.

Identification of practical challenges in physical layer design.

Abstract

Despite the conclusive potential of cognitive radio for provisioning the dynamic and flexible spectrum/channel allocation, the research community should study the performance gain of physical layer over such a radio with cognition capabilities. To this end, several mechanisms of physical layers such as adaptive modulation, multiple-input multiple output antennas; channel coding and/or combination of them should be studied. These studies should be accomplished in terms of spectral efficiency. Therefore, the gain of cognitive radio in wireless networks available into the market will be identified practically. Another issue under consideration should be the performance evaluation of cognitive radio assuming a cross-layer combination between the cognitive physical and the upper layers. To this direction, this paper presents a study on spectral efficiency at the physical layer with cognitive capabilities. In sequel, we study a cross-layer combination of physical layer with upper layers in the same cognitive context. The performance gain of cognitive radio in such a physical layer is realized practically as well as a few cross-layer design issues have been raised.