Frequency Hop Spread Spectrum System Communication System

Among the various types of the spread spectrum systems the slow frequency hop spreadrnspectrum system is discussed.In the transmitter the data input ,which is, text is converted tornbinary data by the ASCII code conversion table.This binary data is modulated using the thernFSK modulator.Then pseudo-random frequencies are generated from pseudo-random coderngenerators and a frequency synthesizer. Using these generated frequencies the modulatorrnoutput signal is hopped or spread to different frequencies. After the spreading process, thernfinal signal output is then transmitted through a non Gaussian plus Gaussian noise channel. Atrnthe receiver before the demodulation process the initial estimate of the receiver phase is madernusing the sequential detection method. Using the intial estimate of the phase the rest of thernreceived phase is tracked using a second order tracking loop. After tracking the phase at thernreceiver end the next step is to dispread the frequency hopped signal. Then demodulation isrncarried out using the matched filter FSK detector .After detection the data output of therndemodulator is converted back to text using the ASCII code table. Finally the receiver getsrnback the text data which was sent at the transmitter

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