Multiband Spectrum Access: Great Promises for Future Cognitive Radio Networks

TL;DR

Multiband cognitive radio networks offer promising improvements in spectrum utilization and network performance, but face challenges in spectrum sensing, hardware, and design tradeoffs that require further research and development.

Contribution

This paper provides an in-depth analysis of recent advancements, limitations, and future directions in multiband spectrum sensing and network design for cognitive radio.

Findings

Enhanced spectrum sensing techniques for multiband access

Tradeoffs in design parameters affecting performance

Potential for improved throughput and reduced handoffs

Abstract

Cognitive radio has been widely considered as one of the prominent solutions to tackle the spectrum scarcity. While the majority of existing research has focused on single-band cognitive radio, multiband cognitive radio represents great promises towards implementing efficient cognitive networks compared to single-based networks. Multiband cognitive radio networks (MB-CRNs) are expected to significantly enhance the network's throughput and provide better channel maintenance by reducing handoff frequency. Nevertheless, the wideband front-end and the multiband spectrum access impose a number of challenges yet to overcome. This paper provides an in-depth analysis on the recent advancements in multiband spectrum sensing techniques, their limitations, and possible future directions to improve them. We study cooperative communications for MB-CRNs to tackle a fundamental limit on diversity and sampling. We also investigate several limits and tradeoffs of various design parameters for MB-CRNs. In addition, we explore the key MB-CRNs performance metrics that differ from the conventional metrics used for single-band based networks.