Why smaller spreading factor can achieve higher data rate What is fundamental principle of spread spectrum?
Jun 172009

For high data rate, simply send fast.

Which one is high data rate ? 2 bits for 1 second vs. 2 bits for 6 seconds.

So, if you want a high data rate, your sending rate should be fast.

Time and frequency relationship is reverse.  Short time duration means wide bandwidth.

That’s why wide bandwidth is need for faster transmission.

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