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Anyone familiar with Bluetooth receiver?

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yubingz

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i want to choose Low IF architecture.

there have a question.

when i use 2MHz IF, zeros-crossing detector can't count 1 cross point more than IF. Because for IF, there have 4 zero crossing points, but for symbol "1", the frequency is 2.14MHz and there have 4.28 zeros crossing points.

how can I distintuish the "0" and "1"?

although consider IQ, the "1" should have 8.56 points and the "0" should have 7.44 pionts.

how to explain it? I read some paper implemented the bluetooth receiver by 2MHz IF and zero-crossing detector.
 

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