Recent advances in wireless communication theory and semiconductor technology had tremendous positive effect on the usability of wireless. As a result, wireless is embedded in virtually every aspect of our life, and this trend is expected to continue to increase in the future. Unfortunately, the electromagnetic spectrum is a scarce resource. As the number of wireless applications grows, the same spectrum is reused over and over again, resulting in increased interference, which jeopardizes the prospect of wireless meeting its high expectations.
Dynamic Spectrum Access is one class of mechanisms proposed to mitigate this problem. It uses various technologies to adapt the operational parameters of wireless networks, to protect them from varying interference or to avoid interfering other networks. However, it naturally increases the cost of equipment, thus potentially reducing the benefit of wireless in different environments.