DS Spread Spectrum Systems
DS Spread Spectrum Systems
(OP)
Can some body help me about understanding "DS Spread Spectrum Systems" as I am facing some difficulty about grasping the real concept behind the scenario.
I will be obliged for your guidance and about any useful web site or e-source (if any) .. Thanks
I will be obliged for your guidance and about any useful web site or e-source (if any) .. Thanks





RE: DS Spread Spectrum Systems
RE: DS Spread Spectrum Systems
connected and sweept through a wide band synchronously:
If there is a strong station somewhere it can interfere
with the communication just for a short time ; it is like
if its energy would be reduced by a large factor by
distribution in time.
Or -- in frequency --:
Imagine if instead of one 100W xmitter you would have
100 1W xmitters at slightly different frequencies and
the outputs of the 100 receivers were added.
<nbucska@pcperipherals.com>
RE: DS Spread Spectrum Systems
In DS SSM, we use a randomly generated bit sequence at high frequency.This sequence we call as pseudo noise and the generator as a Pseudo Random Binary Sequence generator(PRBS). It is pseudo random b'coz(only then,we can demodulate of course) we know the initial 'seed' which we apply to the PRBS generator.
The wideband noise-like sequence when multiplied in time with the incoming sequence, is equivalent to convolution in frequency domain b/w a wide band signal and the message(NarrowBand).This achieves the 'Spreading' for SSM.
Hope my explanation helps..any doubts,.. please post.
RE: DS Spread Spectrum Systems
RE: DS Spread Spectrum Systems