Synchronization in WLAN
Synchronization in WLAN
Synchronization in WLAN
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Received Signal Energy (RSE) Detection<br />
• The algorithm:<br />
• F<strong>in</strong>d the start edge of the packet by measur<strong>in</strong>g the received signal<br />
energy<br />
• When there is no signal received, the received signal r n consists of noise<br />
only r n = w n<br />
• When the packet starts, the received energy is <strong>in</strong>creased by the signal<br />
component r n = w n + s n<br />
The packet can be detected as a change <strong>in</strong> the received energy level<br />
• Use the accumulated signal energy (m n )over a w<strong>in</strong>dow of length L<br />
L−1 L−1<br />
*<br />
n<br />
= ∑ n−k n−k = ∑ n−k<br />
k= 0 k=<br />
0<br />
m r r r<br />
2<br />
<strong>WLAN</strong> <strong>Synchronization</strong> 16.3.2004 © Hafeth Hourani 12
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