Cognitive Radio Network Application Radio

Application of cognitive radios as the wireless terminals in ad hoc networks in emergency situations has distinct advantages. Better bandwidth, interoperability, avoidance of interference, and ant-jamming capabilities are a few such advanta This paper deals with ad hoc networks incorporated with cognitive radios, which acts as wireless terminals, that can be used in emergency situations and can be referred to as Emergency Cognitive Radio Ad Hoc Networks (Emergency CRAHNs). In this paper, we propose the collaborative spectrum sensing methodology using Cognitive Collaborators where multiple cognitive radios operate together such that reliability of spectrum sensing in improved. This proposed system plays a vital role during disaster management. In disaster management situations, the networks usually depend on public networks such as GSM & GPRS. These public networks are likely to get overloaded resulting spectral bandwidth limitations to the multimedia applications and also in worst cases cause denial of service. Usage of cognitive radios in emergency situations has the potential of alleviating the spectrum shortage problem by dynamically accessing free spectrum resources. Such CRAHNs provide flexibility in terms of frequency of operation of the ad hoc network. Cognitive Radio improves the spectrum utilization when there is a congestion or failure of certain existing technologies at times of emergency and disaster, this new technology can be used to meet the user’s needs.This paper proposes a prototype model with software defined radio (SDR) technology. The network-centric cognitive radio architecture under consideration in this paper is aimed at providing a high-performance platform for experimentation with various adaptive wireless network protocols ranging from simple etiquettes to more complex ad-hoc collaboration. © 2015 AENSI Publisher All rights reserved Cognitive Radio Network Application to Disaster Recovery Using Software Defined Radio focus on an OFDM radio platform because it allows a simple characterization of interference in terms of the OFDM subcarriers.Software defined radio, does however, require the implementation of several hardware components. The general layout of the SDR is shown below, in figure 1. In general, the first two blocks of each path and the antenna make up the hardware side of the SDR and the third block is the computer/software.