Introduction to Optical Wireless communicaitons - Northumbria ...
Introduction to Optical Wireless communicaitons - Northumbria ...
Introduction to Optical Wireless communicaitons - Northumbria ...
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
Issue 3: Multipath induced ISI<br />
Diffuse Links offers<br />
Robustness <strong>to</strong> blocking and shadowing<br />
Allows roaming<br />
Avoid complex alignment and tracking<br />
between transmitter and receiver<br />
Challenges<br />
<br />
<br />
<br />
<br />
For most surfaces, the light wave is<br />
diffusely reflected (as from a matter<br />
surface) rather than specularly reflected<br />
(as from a mirrored surface).<br />
Pulse spreading beyond symbol duration.<br />
High inter-symbol interference (ISI).<br />
Low data rate and high power penalty.<br />
Amplitude<br />
1<br />
0.8<br />
0.6<br />
0.4<br />
0.2<br />
0<br />
Transmitted singal<br />
Received signal<br />
0 0.05 0.1 0.15 0.2<br />
Time (µS)
Change language