It is a radio whose components that have been typically implemented in hardware (e.g. mixers, filters, amplifiers, modulators/demodulators, detectors, etc.) are instead implemented by means of software on a personal computer or embedded system. It can accommodate different radio frequencies through software. In an ideal software radio, all the bands and modes should be tuned through the software according to the needs.
Published in Chapter:
Fundamentals of Software Defined Radio and Cooperative Spectrum Sensing: A Step Ahead of Cognitive Radio Networks
Jyoti Sekhar Banerjee (Bengal Institute of Technology, India) and Arpita Chakraborty (Bengal Institute of Technology, India)
Copyright: © 2015
|Pages: 45
DOI: 10.4018/978-1-4666-6571-2.ch019
Abstract
Software Defined Radio (SDR) and Cognitive Radio (CR) are the key enabling technologies to overcome the spectrum scarcity problem a bit, by supporting dynamic spectrum access 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 senses the environment and enables a secondary system to share the licensed spectrum with the primary system, which usually has exclusive access. The performance of the secondary system could be enhanced by Cooperative Spectrum Sensing (CSS) as it increases the primary detection probability. Again cognitive radio network greatly benefits from a cooperative transmission, employing intermediate nodes as relays. This chapter is focused on software defined radio, its architecture, limitations, then evolution to cognitive radio network, architecture of the CR, and its relevance in the wireless and mobile ad-hoc networks. Additionally, an overview of Cooperative Spectrum Sensing (CSS), its classification, components, challenges, and Cooperative Relay are discussed.