In a less mathematical and more qualitative explanation, consider that
at any point in time, one bit of your signal is spread out over a wide
frequency spectrum. If you think of adding up all of the measurements
of little frequency bins across the whole spread spectrum, the noise
in each bin, being random, will average to zero and cancel out, while
signal, being consistently the same, will add up in one direction.
@(^.^)@ Ed
On 12/8/11 3:32 PM, Nick Foster wrote:
http://en.wikipedia.org/wiki/Process_gain
On Thu, Dec 8, 2011 at 12:30 PM, Matt Mills<[email protected]> wrote:
2011/12/8 Dan CaJacob<[email protected]>
Hi Kouki,
I don't think you will see the signal in an FFT window. GPS is spread
spectrum and the signal is below the noise floor. But the signal is
still decodable.
I thought this was the case; but as someone without any DSP experience this
boggles the mind... Does anyone have any more info on GPS or how you decode
it even though you cant "see" a signal?
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