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Bluetooth Zero Crossing question

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yubingz

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bluetooth zero crossing if

Hi,

A bluetooth receiver used 2MHz Low IF architecture. Data symbol time is 1uS. Consider I.Q there should have 8 zero crossing points in 1uS when received signal is 2MHz IF signal.

The frequency deviation is 320kHz in bluetooth. The 2.16MHz signal should have 8.64 zero crossing points and 1.84MHz signal should have 7.36 zero crossing points.

The question is how can I distinguish the +/- frequency deviation by zero crossing points?

Thank you!
 

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