Seminartopics.in

IT Seminar Topics >> Cognetive Radio Security Seminar Report, PPT, PDF
 

 

Abstract of Cognetive Radio

Cognitive radio (CR) is a newly emerging technology, which has been recently proposed to implement some kind of intelligence to allow a radio terminal to automatically sense, recognize, and make wise use of any available radio frequency spectrum at a given time. The use of the available frequency spectrum is purely on an opportunity driven basis. In other words, it can utilize any idle spectrum sector for the exchange of information and stop using it the instant the primary user of the spectrum sector needs to use it. Thus, cognitive radio is also sometimes called smart radio, frequency agile radio, police radio, or adaptive software radio,1 and so on. For the same reason, the cognitive radio techniques can, in many cases, exempt licensed use of the spectrum that is otherwise not in use or is lightly used; this is done without infringing upon the rights of licensed users or causing harmful interference to licensed operations.

The only difference with SDR (Software Defined Radio) is that a cognitive radio needs to scan a wide range of frequency spectra before deciding which band to use, instead of a predefined one, as an SDR terminal does. One of the most important characteristic features of an SDR terminal is that its signal is processed almost completely in the digital domain, needing very little analogue circuit. This brings a tremendous benefit to make the terminal very flexible (for a multimode terminal) and ultrasmall size with the help of state-of-the-art microelectronics technology.

a. Main focution of Cognetive Radio

• Spectrum Sensing: detecting the unused spectrum and sharing it without harmful interference with other users, it is an important requirement of the Cognitive Radio network to sense spectrum holes, detecting primary users is the most efficient way to detect spectrum holes. Spectrum sensing techniques can be classified into three categories:

Transmitter detection : cognitive radios must have the capability to determine if a signal from a primary transmitter is locally present in a certain spectrum, there are several approaches proposed:
�� matched filter detection
�� energy detection
�� cyclostationary feature detection

o Cooperative detection : refers to spectrum sensing methods where information from multiple Cognitive radio users are incorporated for primary user detection.

o Interference based detection .

 


|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

|

 

You may also like this :

Dynamic Memory Allocation
Dynamic Synchronous Transfer Mode
Dynamic Virtual Private Network
Dynamically Reconfigurability Computing
Earth Simulator
EDGE
Elastic Quotas
Ethernet Passive Optical Network
Extreme Programming (XP)
Fiber Distributed Data Interface
Firewalls
Free Space Laser Communications
Freenet
Wine
Virtual Storage Access Method
Trojan Horse
Team Viewer
Tablet Personal Computer
Surface Computer
Streaming Media
SCADA
SAP R/3 Architecture
Redtacton
Portable Microcomputer-Based Instruments
Pico Projectors
Multirate Signal Processing Techniques MRSP
Multicast Security
MongoDB
Mobile Number Portability
HVDC Light

 
Copyright © 2012 www.seminartopics.in      Contact us: seminar990@gmail.com