cognitive radio


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cognitive radio

Wireless communications techniques that can sense the signals in the environment and change channels in real time. Such systems must accurately detect the type and bandwidth of the channels transmitting in the vicinity. Cognitive radio (CR) has become an important issue in order to allow the same limited spectrum to be shared with the increasing number of wireless devices in the home, office and industrial facilities. See Internet of Things, M2M, 802.11ah, 802.11af and 802.22.
References in periodicals archive ?
Durak-Ata, "Dispersed chirp-z transform-based spectrum sensing and utilization in cognitive radio networks," IET Signal Processing, vol.
In the area of clustering in cognitive radio networks, there has been a lot of research work, but only a few of them considered the stability of the cluster formed.
In this paper, Multi-Antenna System with Blind Source Separation (bSS) is applied in the context of cognitive radio. BSS provide the secondary users with the ability to eliminate the silence period during the spectrum sensing and then enhance the secondary throughput.
However, cognitive radio has also encountered various types of security threats, as well as challenges in the networks, due to the open nature of the cognitive radio architecture [11, 12].
For the simulation, cognitive radio network parameters are set with S including NSUs, MUs, and FC.
As the Cognitive Radio moniker suggests, the emphasis on these techniques is for the radio to adapt to its environment.
Cognitive radio (CR) [1], [2] has been consequently proposed to solve the inefficiency in spectrum assignments of legacy static radio.
Keywords: (SDR) Software Defined Radios,(RF) Radio Frequency, (ADC) Analog to Digital Conversions, (DAC) Digital to Analog Conversions,(DUC) Digital up Conversion,(DDC) Digital Down Conversion, (CR) Cognitive Radio, (CRN) Cognitive Radio Networks, (UWB) Ultra-wideband Communications,(PU) Primary User,(SU) secondary user,(SNR) Signal to Noise Ratio,(AWGN) Additive White Gaussian Noise,(PCM) Pulse Code Modulation,(FFT) Fast Fourier Transform,(MF) Match Filter.
The cognitive radio networks respond to the need of making a flexible use of the spectrum in order to optimize the spectrum resources that are scarce in the wireless networks.
Abstract: Cognitive radio networks (CRNs) have emerged as a paradigm addressing the problem of limited spectrum availability and the spectrum underutilization in wireless networks by opportunistically exploiting portions of the unused spectrum by licensed primary users (PUs).
Objective: The SCREEN project brings the concept of cognitive radio to Space and exploits the benefits that this technology has already shown in the terrestrial domain.

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