Cognitive Radio Research Papers

Cognitive Radio Research Papers-54
His research interests include optical and wireless convergence, modeling and simulation of communication network system and machine learning application in wireless communication and networking.A cognitive radio (CR) is a radio that can be programmed and configured dynamically to use the best wireless channels in its vicinity to avoid user interference and congestion.Filling free RF bands adaptively, using OFDMA, is a possible approach. Applications of spectrum-sensing cognitive radio include emergency-network and WLAN higher throughput and transmission-distance extensions.

His research interests include optical and wireless convergence, modeling and simulation of communication network system and machine learning application in wireless communication and networking.A cognitive radio (CR) is a radio that can be programmed and configured dynamically to use the best wireless channels in its vicinity to avoid user interference and congestion.Filling free RF bands adaptively, using OFDMA, is a possible approach. Applications of spectrum-sensing cognitive radio include emergency-network and WLAN higher throughput and transmission-distance extensions.

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However, cognitive radio cannot occupy the same unused space all the time.

As spectrum availability changes, the network adapts to prevent interference with licensed transmissions.

IEEE 802.22 was designed to utilize the unused frequencies or fragments of time in a location.

This white space is unused television channels in the geolocated areas.

In response to the operator's commands, the cognitive engine is capable of configuring radio-system parameters.

These parameters include "waveform, protocol, operating frequency, and networking".The first cognitive radio wireless regional area network standard, IEEE 802.22, was developed by IEEE 802 LAN/MAN Standard Committee (LMSC) and published in 2011.This standard uses geolocation and spectrum sensing for spectral awareness.This functions as an autonomous unit in the communications environment, exchanging information about the environment with the networks it accesses and other cognitive radios (CRs).A CR "monitors its own performance continuously", in addition to "reading the radio's outputs"; it then uses this information to "determine the RF environment, channel conditions, link performance, etc.", and adjusts the "radio's settings to deliver the required quality of service subject to an appropriate combination of user requirements, operational limitations, and regulatory constraints". Snider, Lawrence Lessig, David Weinberger, and others say that low power "smart" radio is inherently superior to standard broadcast radio. It was a novel approach in wireless communications, which Mitola later described as: The point in which wireless personal digital assistants (PDAs) and the related networks 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 to provide radio resources and wireless services most appropriate to those needs.It has been shown that a simple energy detector cannot guarantee the accurate detection of signal presence, calling for more sophisticated spectrum sensing techniques and requiring information about spectrum sensing to be regularly exchanged between nodes.Increasing the number of cooperating sensing nodes decreases the probability of false detection. Jondral of the University of Karlsruhe proposed a spectrum pooling system, in which free bands (sensed by nodes) were immediately filled by OFDMA subbands.Regulatory bodies in the world have been considering whether to allow unlicensed users in licensed bands if they would not cause any interference to licensed users.These initiatives have focused cognitive-radio research on dynamic spectrum access.Some "smart radio" proposals combine wireless mesh network—dynamically changing the path messages take between two given nodes using cooperative diversity; cognitive radio—dynamically changing the frequency band used by messages between two consecutive nodes on the path; and software-defined radio—dynamically changing the protocol used by message between two consecutive nodes. The concept of cognitive radio was first proposed by Joseph Mitola III in a seminar at KTH (the Royal Institute of Technology in Stockholm) in 1998 and published in an article by Mitola and Gerald Q. Cognitive radio is considered as a goal towards which a software-defined radio platform should evolve: a fully reconfigurable wireless transceiver which automatically adapts its communication parameters to network and user demands.Traditional regulatory structures have been built for an analog model and are not optimized for cognitive radio.

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