| The 2.4 GHz ISM band is quite popular and there are plenty of devices operating in same frequency region with different protocols and power levels. This variation in signal creates electromagnetic interference, reduces signal strength and introduces errors in received signal data. It gives poor connectivity to end users causing spectrum congestion which degrade the quality of overall communication. The ISM band is used at various places such as home, office, hospitals and education system, where data security is of high importance. This thesis presents how software defined radio can be used in providing security at physical layer of ISM band and can prevent intrusions in the network. We also discuss how excessive use of spectrum can be alleviated by mapping ISM band channels to unused spectrum with the help of advanced form of software defined radio called cognitive radio. |
