20 Years of Evolution From Cognitive to Intelligent Communications

Abstract

It has been 20 years since the concept of cognitive radio (CR) was proposed, which is an efficient approach to provide more access opportunities to connect massive wireless devices. To improve the spectrum efficiency, CR enables unlicensed usage of licensed spectrum resources. It has been regarded as the key enabler for intelligent communications. In this article, we will provide an overview on the intelligent communication in the past two decades to illustrate the revolution of its capability from cognition to artificial intelligence (AI). Particularly, this article starts from a comprehensive review of typical spectrum sensing and sharing, followed by the recent achievements on the AIenabled intelligent radio. Moreover, research challenges in the future intelligent communications will be discussed to show a path to the real deployment of intelligent radio. After witnessing the glorious developments of CR in the past 20 years, we try to provide readers a clear picture on how intelligent radio could be further developed to smartly utilize the limited spectrum resources as well as to optimally configure wireless devices in the future communication systems.

Symbiotic Radio: Cognitive Backscattering Communications for Future Wireless Networks

“…CR is an enabling technology to support efficient utilization of the radio spectrum, in which the secondary user is allowed to reuse the frequency bands assigned to the licensed primary user in an opportunistic or spectrum sharing manner [4]- [7].…”

“…From (7), the primary symbol, s k (n), is in both the direct and backscattering links, thus the receiver can treat the backscattering link as an additional path when decoding the primary symbols. As such, the achievable rate R s of the primary system satisfies…”

“…In the past two decades, cognitive radio (CR) technology has been extensively studied with the aim to enhance the utilization efficiency of the radio spectrum [4]- [7]. This is achieved through introducing secondary spectrum access to the assigned spectrum.…”

A Deep Learning‐Based Power Control and Consensus Performance of Spectrum Sharing in the CR Network

“…Intelligent processing is one of the major advantages of CRN [1]. Due to this feature, these systems possess the capability to learn their environment, increase awareness, and reconfigure themselves accordingly.…”

Bilişsel Radyo Uygulamaları için Uzun Süreli Spektrum Doluluk Ölçümleri: Samsun Şehir Merkezi Örneği

“…İkincil kullanıcılar, spektrumu tarayarak en uygun iletim kanalını herhangi bir girişime neden olamayacak şekilde belirleyip, veri iletiminde kullanılacak olan modülasyon türü ve verici gücü gibi pek çok radyo parametresini kanal şartlarına göre gerçek zamanlı olarak ayarlar. Bilişsel radyo uygulamaları günümüzün güncel çalışma konularından olup literetürde bu konuda yapılan pek çok çalışma bulunmaktadır [6][7][8][9][10][11][12][13].…”