A}daptive Modulator Design (S/W) for {SDR

Gaurav Thakur; Ankit Chourasia; Ankita Chauhan

With the exponential growth in the ways and means by which people need to communicate – data, voice, video, broadcast message, command and control communications etc. modifying radio devices easily and cost-effectively has become critical. The future information age is equipped with rich and affordable telecommunication services. So in future people will need flexibility while using the wireless equipments. Consider a radio which autonomously detects and exploits empty spectrum to increase your file transfer rate. What if this same radio could remember the locations where your calls tend to drop and arrange for your call to be serviced by a different carrier for those locations. These are some of the ideas motivating the development of cognitive radio (CR). In effect, a cognitive radio is a software radio whose control processes leverage situational knowledge and intelligent processing to work towards achieving some goal related to the needs of the user, application, and/or network. Wireless communications systems and standards have been developed around the world without any global plan. Recently hardware technology evolved significantly. Some of the key milestones in this progress are transition from analog hardware to digital hardware and then introduction of sophisticated processors. This is followed by the development of Software Defined Radio (SDR) structures and virtual hardware that are still in development process currently. Software Defined Radio (SDR) system is a useful and adaptable future-proof solution to cover both existing and emerging standards, it provides elements with re-configurability, intelligence and software programmable hardware. Moreover, it has capability of providing global seamless connectivity and solves the interoperability issue. The operating carrier frequency range for various modulation scheme is depicted in the paper. The effects of carrier noise on the modulated signal is also depicted.

Select Volume / Issues:

• Volume 4 Issue 4, July 2013

Year:

2013

Type of Publication:

Article

Keywords:

Cognitive Radio; SDR; Matlab; M-File; Total Harmonic Distortion; Cognitive Radio Network

Journal:

IJECCE

Volume:

4

Number:

4

Pages:

1278-1281

Month:

July