Identifying Unwanted Signal In A Spread Spectrum Band
George Edwards · 2019
In May, 1985, the Federal Communications Commission (FCC) allowed the unlicensed use of spread spectrum (SS) in the Industrial, Scientific and Medical (ISM) band for commercial transmission without the need for a license as long as the user follows certain guideline in terms of transmission power level. The scarcity of communication bandwidth has lead researchers to investigate algorithms to identify busy channels over the airwave so they can be avoided and not add to communication degradation. This is very salient in the over used ISM band. In the ISM band the solution lies in developing efficient algorithms to detect which parts of the band are being used and utilize an agile communication system to hop to the available parts which support good communication. In addition, a solution of this nature can find application in electronic warfare, where fire fighters in the field would like to identify enemy attacks on their frequency hop spread spectrum (FHSS) channels and take appropriate measures to protect their communication channels from a jammer's interference. This paper is based on a scaled down version of the Bluetooth FHSS channel model. It proposes the use a polyphase channelizer to identify an active channel.