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Some doubts in Spread Spectrum Technique

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iVenky

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Recently I read an article on DSSS. I don't know a lot about it so I have some doubts in it. Basically they say they increase the bandwidth and make it look like a Gaussian noise. If this is the case then the signal energy is spread throughout the entire spectrum than a normal narrow band signal. When they use a correlator in the receiver then this correlator gives you the maximum output for the signal and removes any interfering narrow band signal.

Now this is my doubt- How can this prevent the enemy from reading this? I mean if they believe that the noise they see is DSSS then they too can decode the message using the correlator right?


Thanks in advance.
 

DSSS is wide-band modulation with a pseudo-random carrier. That can only happen if the enemy has the pseudo-random modulation code and can synchronous with it
 

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