Spread spectrum modulation

Spread spectrum modulation 

Definition: 
                  "Spread spectrum modulation is a technique in which a communication signal is transmitted on a bandwidth considerably larger than the frequency content of the original information. Frequency hopping is a basic modulation technique used in spread spectrum signal transmission".

Spread  spectrum  modulation

Spread  spectrum  modulation 



















S S Mdulation Techniques





S S Mdulation Techniques

S S Mdulation Techniques



Applications of spread spectrum modulation




   
•       Applications of DS-SS system
Applications of DS-SS system
Applications of DS-SS system



























FH-MFSK receiver:
FH-MFSK receiver
FH-MFSK receiver




Frequency hop spread M-ary FSK transmitter

Frequency hop spread M-ary FSK transmitter















DSSS Coherent Binary Phase-Shift Keying  Receiver








 







 Frequency hop spread M-ary FSK transmitter





Magnified waveform for the period of 1st cycle



PSEUDO-NOISE (P-N) sequences 


Spread spectrum signal m(t)=b(t).c(t)



maximum length sequence generator




- model of spread spectrum digital communication system 




waveform of DS-SS transmitter  













DSSS Coherent Binary Phase-Shift Keying Transmitter