Synchronization in WLAN
Synchronization in WLAN
Synchronization in WLAN
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Frequency <strong>Synchronization</strong><br />
• OFDM is very sensitive to the carrier frequency offset<br />
• The carrier frequency error causes a significant SNR degradation <strong>in</strong><br />
OFDM<br />
• The degradation is caused by two ma<strong>in</strong> phenomena:<br />
• Subcarrier amplitude reduction<br />
• This is because the desired subcarrier is no longer sampled at the peak of the s<strong>in</strong>cfunction<br />
of DFT<br />
• ICI caused by neighbor<strong>in</strong>g subcarriers<br />
• The SNR degradation is approximated by<br />
10 Es<br />
SNRloss<br />
= ( πTf ∆ ) dB<br />
3ln10 N<br />
0<br />
<strong>WLAN</strong> <strong>Synchronization</strong> 16.3.2004 © Hafeth Hourani 28
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