Introduction to Optical Wireless communicaitons - Northumbria ...

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LOS Links Rx Narrow low power transmit beam Narrow field-of-view receiver Tx Advantages Least path loss No multipath propagation High data rate Suitable to point-to-point communications only. Problems Noise is limiting factor Possibility of blocking/shadowing Tracking necessary No/limited mobility
Diffuse Links Tx Rx Use multiple reflections of the optical beam on surrounding surfaces such as ceilings, walls, and furniture. transmitter and receiver not necessarily directed one towards the other. Robust to blocking and shadowing Allows roaming Problems: High path loss. Multiple paths (reflections) - Result in inter-symbol interference (ISI). High power penalty due to ISI. Limited bandwidth- Due to large capacitance of the large area detectors
Page 1 and 2: Free space optics (Optical Wireless
Page 3 and 4: History of OWC 800BC Fire beacons (
Page 5 and 6: RF Bandwidth Congestions
Page 7 and 8: OWC: Overview • light beams (visi
Page 9 and 10: Comparison with RF Property Radio I
Page 11 and 12: Applications Send signal Send and r
Page 13 and 14: OWC- Applications Other application
Page 15: Classification of Indoor OWC Links
Page 19 and 20: Propagation types and definitions D
Page 21 and 22: LOS/WLOS link margin analysis The c
Page 23 and 24: Safety Classifications - Point Sour
Page 25 and 26: Eye- safety- Possible Solutions Ad
Page 27 and 28: ALI-Possible Solutions Differentia
Page 29 and 30: Channel Model and Performance witho
Page 31 and 32: Long Distance Systems

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