Open Research issues in Cognitive Radio
Amna Saad Kamil, Ibrahim Khider · 2008
Abstract — Cognitive Radios have been receiving increasing attention in academia, industry, and government. This has come after several studies indicating that up to 90 % of the allocated radio spectrum less than 3GHz is idle most of the time [1]. As a result, spectrum regulation around the world is in progress to allow unlicensed access on a non-interfering [2] [3]. Current researches are investigating different techniques of using cognitive radio to reuse more locally unused spectrums to increase the total system capacity. However, there are many issues across all layers of a cognitive radio system design. In this paper we address cognitive radio issues for enabling cognitive radio including more spectrums sensing, protocol, hardware, security and algorithmic challenges that could limit their performance or even make them infeasible. We also give some insight into the evolution of cognitive radios and characteristics. We conclude highlighting open research challenges in this exciting area. Key words: Cognitive radio, radio environment, spectrum sensing. I.