Cognitive Radio
By Kevin Curran, Gary O' Callaghan, Fionnuala McCullough. Computer and Information Science, 2008
303 citations recorded by the source corpus.
Cognitive radio is where wireless devices are sufficiently computationally intelligent about radio resources and related computer-to-computer communications to detect user communications needs as a function of use context, and provide radio resources and wireless services most appropriate to those needs. Its roots came from the discovery by regulatory bodies in various countries which found that most of the radio frequency spectrum was inefficiently utilised. For example, cellular network bands are overloaded in most parts of the world, but amateur radio and paging frequencies are not. Independent studies concluded that spectrum utilization depends strongly on time and place. Moreover, fixed spectrum allocation prevents rarely used frequencies from being used by unlicensed users, even when their transmissions would not interfere at all with the assigned service. This was the reason for allowing unlicensed users to utilize licensed bands whenever it would not cause any interference. Cognitive radio can monitor, observe, and react to events in a specified environment. The fundamental benefits are the ability to self-adapt, self-manage, and self-optimize under normal conditions, and the ability to self-diagnose and self-heal when unusual problems arise e.g. base stations can automatically adjust operating range (e.g., by controlling transmit power, receiver sensitivity, data rate, frequency channel selection) to compensate for neighboring base stations that fail. In contrast to many wireless systems where static frequency channels are pre-selected in advance and tedious frequency planning is mandatory to minimize interference from equipment operating in adjacent coverage areas. CR can achieve a performance that is close to a licensed band even when using an unlicensed band due primarily to its inherent ability to switch to best channels. This paper provides an overview of Cognitive Radio.
Subfields: Computer Networks and Communications
View Paper: https://www.semanticscholar.org/paper/240ef5d9930fc933dfe50552e5b60f4e3c102ce1
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In Computer Networks and Communications
Citations in the corpus
- High-$Q$ Tunable Microwave Cavity Resonators and Filters Using SOI-Based RF MEMS Tuners (2010, background): “TUNABLE RF/Microwave filters are essential components for the next generation reconfigurable radio front-ends in wireless communication systems with multi-band and multistandard characteristics [2].”
- A Survey of Dynamic Spectrum Access (2007, unknown): “Cognitive radio, built on a software radio platform, is a context-aware intelligent radio potentially capable of autonomous reconfiguration by learning from and adapting to the communication environment [14].”
- Moving on from Weiser's Vision of Calm Computing: Engaging UbiComp Experiences (2006, background): “The advocates of this new technology portray its potential for highly complex settings, such as combat war zones to help commanders from different friendly forces stay appraised of the latest situation, through voice, data and video links, thereby reducing collateral damage [4].”
- Ambient Backscatter Communications: A Contemporary Survey (2017, background): “Cognitive Radio Networks (CRNs) are first introduced in [165] to utilize the spectrum more efficiently.”
- Dynamic Spectrum Access: Signal Processing, Networking, and Regulatory Policy (2006, background): “Cognitive radio, built upon a software radio platform, is a context-aware intelligent radio capable of autonomous reconfiguration by learning and adapting to the communication environment [16].”
- Multiantenna-Assisted Spectrum Sensing for Cognitive Radio (2010, background): “The authors would like to thank Dr. J. Mitola, III, for his helpful comments and suggestions on this paper.”
- Achievable rates in cognitive radio channels (2006, unknown): “M OTIVATION Recently, there has been an explosion of interest in cogniti ve and software radios, as is evidenced by FCC proceedings [5], [6], talks [20], and papers [15], [19 ].”