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Old November 21st 07, 10:38 PM posted to rec.radio.amateur.antenna
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Default Wireless packet data transmission


"MRW" wrote in message
...
Hello again!

I know some of you guys deal with propagation effects, so I figured I
could ask a related question.

In my understanding, a packet is just a way to sectionalize and
categorize individual bits. One group would represent the destination/
address/header. Another would be the actual data (or payload), and
then, maybe a trailer section. Is this a correct assumption?

In wireless transmission, where multipath effects are present, how
does the receiver actually "know" if the order of bits are correct
when processing the packets?

Thanks!


they include a checksum to check the data. basically you take all the data
bytes in the packet, add them together, and compare that to a number in the
header. if they match its good, if not you throw it away and request a
repeat.


 
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