Spread Spectrum Interference Issues in the Mhz Ism Band by Rajnish Sinha

OF THE THESIS Spread Spectrum Interference Issues In The MHz ISM Band by Rajnish Sinha Thesis Director Professor Roy D Yates In this thesis we investigate the use of the MHz unlicensed band for wireless communications This band has been allocated by the FCC Federal Communications Commission for industrial scienti c and medical ISM applications Although a li cense is not required to operate in this band one does need to comply with a minimum set of rules laid down by the FCC Due to the high cost of licensing of radio spectrum the unlicensed band o ers a free and attractive alternative to service providers As a consequence this band is witnessing a rapid growth in both the number of systems as well as the diverse technologies being used by them However this latitude comes at a price in the form of susceptibility to excessive mutual interference Since the systems operate independently and do not cooperate with each other it becomes necessary for them to be able to sustain the mutual interference Among the various products operating in the ISM band this thesis will focus on a particular class of products designated by the FCC as the Devices Part devices include wireless LANs Cordless phones and automatic meter readers