Synchronization in WLAN
Synchronization in WLAN
Synchronization in WLAN
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Correct<strong>in</strong>g the Sampl<strong>in</strong>g Frequency Error<br />
• The rotation caused by the sampl<strong>in</strong>g frequency offset can be corrected<br />
with two ma<strong>in</strong> approaches<br />
• By adjust<strong>in</strong>g the sampl<strong>in</strong>g frequency for the receiver ADC<br />
n(t)<br />
s(t)<br />
H(f)<br />
r(t)<br />
ADC<br />
FFT<br />
Decision<br />
VCXO DPLL<br />
• By de-rotat<strong>in</strong>g the subcarrier after the DFT process<strong>in</strong>g<br />
n(t)<br />
s(t)<br />
H(f)<br />
r(t)<br />
ADC<br />
rob/stuff<br />
FFT<br />
POTOR<br />
Decision<br />
-<br />
-<br />
Fixed<br />
Xtal<br />
DPLL<br />
<strong>WLAN</strong> <strong>Synchronization</strong> 16.3.2004 © Hafeth Hourani 26
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