Dynamic Spectrum Access Simulation

Topics: Wireless, Radio, Radio resource management Pages: 22 (5562 words) Published: August 23, 2012
SOFTWARE DEFINED COGNITIVE RADIO USING MATLAB

SOFTWARE DEFINED COGNITIVE RADIO USING MATLAB

INDEX

ABSTRACT…….………………………………………………………………....................................5

Chapter 1 -SOFTWARE-DEFINED RADIO
1.1 Introduction to Software-Defined Radio………………………………………………6 1.2 A brief history of SDR ………………………………………………………………………….7 1.3 Role of SDR ………………………..……………………………………………………………….7 1.4.1 Problems faced by Wireless Communication Industry 1.4.2 How SDR solves the problems

1.4 Features of SDR……………………………………………………...............................9

Chapter 2 –COGNITIVE RADIO TECHNOLOGY
1
2
3.1 A vision of Cognitive Radio…………………………………………………………..……10 3.2 History Leading to Cognitive Radio……………………………………………………10 3.3 Information on Cognitive Radio…………………………………………………………11 3.4 Cognitive Radio Network Paradigms………………………………………………….13 3.5.1 Underlay Paradigm

3.5.2 Overlay Paradigm
3.5.3 Interweave Paradigm

Chapter 3- IMPLEMENTATION
3
4.5 Algorithm…………………………………….…….…….…….…….…….…….…….…….…15 4.6 Related Theory…………….………………………….…….…….…….…….…….….…….16 4.7.4 About MATLAB & Simulink
4.7.5 DSB-SC AM Modulation
4.7.6 Power Spectral Density

Chapter 4- SIMULATION
4.1 Simulink Model …………………………………………………………….…..…….19 4.2.1 Block Details
4.2.2 Block Properties
4.2 Matlab Code……………………………………………………….…….……..……..26 4.3 Results and Graphs ……………………………………………….…….….….…..28 4.4 Interpretation of Results ………………………………………………..…….…33

Chapter 5 – FUTURE SCOPE OF COGNITIVE RADIO…………………………….…….34

REFERENCES…..…………………………………………………………………………………….……35

ABSTRACT

This report contains basic information on Cognitive Radio and Software Defined Radio. Software Defined Radio is an emerging technique in this domain that promises easy portability and adaptability of new techniques on the same hardware. Cognitive Radio technique utilizes this Software Defined Radio to intelligently and efficiently utilize the available frequency spectrum knowing about the side information of other users sharing the same spectrum. The report talks about the Cognitive Radio technique and goes into details of its Software implementation (on Simulink and MATLAB) using Spectrum Sensing and the practicality of cognitive radio in our present scenario of communication and its actual hardware implementation on Software Defined Radio.

Chapter 1
SOFTWARE DEFINED RADIO
1.1 Introduction to Software-Defined Radio
With the exponential growth in the ways and means by which people need to communicate - data communications, voice communications, video communications, broadcast messaging, command and control communications, emergency response communications, etc. - modifying radio devices easily and cost-effectively has become business critical. Software defined radio (SDR) technology brings the flexibility, cost efficiency and power to drive communications forward, with wide-reaching benefits realized by service providers and product developers through to end users. Simply put Software Defined Radio is defined as:

"Radio in which some or all of the physical layer functions are software defined" Software-Defined Radio (SDR) refers to the technology wherein software modules running on a generic hardware platform consisting of DSPs and general purpose microprocessors are used to implement radio functions such as generation of transmitted signal (modulation) at transmitter and tuning/detection of received radio signal (demodulation) at receiver.

SDR technology can be used to implement military, commercial and civilian radio applications. A wide range of radio applications like Bluetooth, WLAN, GPS, Radar, WCDMA, GPRS, etc. can be implemented using SDR technology.

Traditional hardware based radio devices limit cross-functionality and can only be...
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