Modeling of Software Defined Radio Architecture and Cognitive Radio: The Next Generation Dynamic and Smart Spectrum Access Technology

Modeling of Software Defined Radio Architecture and Cognitive Radio: The Next Generation Dynamic and Smart Spectrum Access Technology

Jyoti Sekhar Banerjee (Bengal Institute of Technology, India) and Arpita Chakraborty (Bengal Institute of Technology, India)
DOI: 10.4018/978-1-4666-6212-4.ch006
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Abstract

Today's wireless networks are characterized by fixed spectrum assignment policy. The spectral scarcity and the inefficiency in the spectrum usage necessitate new communication paradigms to exploit the existing wireless spectrum, opportunistically. Software Defined Radio (SDR) and Cognitive Radio (CR) are the very paradigms for wireless communication, in which either a network or a wireless node reconfigures its transmission or reception parameters to communicate efficiently, avoiding interference with licensed or unlicensed users. CR adapts itself to the newer environment on the basis of its intelligent sensing and captures the best available spectrum to meet user communication requirements. When the radio link features are extended to the network layer, the cognitive radios form the cognitive radio network. This chapter is focused on software defined radio, its architecture, its limitations, evolution to cognitive radio network, architecture of the CR, and its relevance in wireless and mobile ad-hoc networks.
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Software Defined Radio (Sdr)

A number of definitions can be found to describe Software Defined Radio (SDR), also known as Software Radio. The SDR Forum, working in collaboration with the Institute of Electrical and Electronic Engineers (IEEE) P1900.1 group, has worked to establish a definition of SDR that provides consistency and a clear overview of the technology and its associated benefits. Therefore, SDR is defined as:

Radio in which some or all of the physical layer functions are software defined.

Another definition that seems to encompass the essence of the SDR is that it has a generic hardware platform on which software runs to provide functions including modulation and demodulation, filtering (including bandwidth changes), and other functions such as frequency selection and if required frequency hopping. By reconfiguring the software or simply by downloading a new program, SDR is able to inter operate with different wireless protocols, incorporate new services, and upgrade to new standards.

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