[MLB-WIRELESS] History of Spread Spectrum with beginners intro

[paul van den bergen]

On Tue, 9 Sep 2003 10:45 pm, vak at alphalink.com.au wrote:
> Spread spectrum on the other hand, takes a large frequency range and fills
> it with many "carriers". By occupying a larger frequency range (frequency
> bandwidth), it allows us to send more 1's and 0's - and this translates
> into greater data bandwidth.

Actually, something that has bothered me about SS is that how does the 
propagation timing affect the transmittion.  I understand that each device 
has a chip that knows the SS sequence.  Given that a signal takes a finite 
time to travel from Tx to Rx, and that time sync. over any distance is 
notoriously difficult, how does this affect the transmittion?

things I can guess at - the Rx tunes into and continually shifts (esp. moving 
stations) the timing of the sequence. This seems the most obvious.

Does this mean that the speed at which 2 stations is moving at will limit data 
rates?



-- 
Dr Paul van den Bergen
Centre for Advanced Internet Architectures
caia.swin.edu.au
pvandenbergen at swin.edu.au
IM:bulwynkl2002
"And some run up hill and down dale, knapping the chucky stones 
to pieces wi' hammers, like so many road makers run daft. 
They say it is to see how the world was made."
Sir Walter Scott, St. Ronan's Well 1824 


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