Wireless infrared indoor Wireless infrared indoor communications: communications: how to combat the multi-path distortion how to combat the multi-path distortion S. Jivkova and M.Kavehrad S. Jivkova and M.Kavehrad Center for Information & Communications Technology Center for Information & Communications Technology Research (CICTR) Research (CICTR) Department of Electrical Engineering Department of Electrical Engineering The Pennsylvania State University The Pennsylvania State University Photonic EAST 2000 Photonic EAST 2000
19
Embed
Wireless infrared indoor communications: how to combat the multi-path distortion S. Jivkova and M.Kavehrad Center for Information & Communications Technology.
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Wireless infrared indoor communications: Wireless infrared indoor communications: how to combat the multi-path distortionhow to combat the multi-path distortion
S. Jivkova and M.KavehradS. Jivkova and M.KavehradCenter for Information & Communications Technology Research (CICTR)Center for Information & Communications Technology Research (CICTR)
Department of Electrical EngineeringDepartment of Electrical EngineeringThe Pennsylvania State UniversityThe Pennsylvania State University
Photonic EAST 2000Photonic EAST 2000
OutlineOutline
• Multi-Spot Diffusing Configuration (MSDC): characteristic features
• Multi-path distortion
• Receiver geometrical configuration
• Channel parameters
• Novel receiver optical front-end design
• Conclusions
Photonic East 2000Photonic East 2000
Characteristic features
• One-to-many and many-to-one communications
• Lack of alignment requirement
• Roaming possible
• Can be virtually free from multipath induced temporal distortion
Room size: 8m x 8m x 4mReflectivity of room surfaces: 0.7Number of reflections considered: 5Transmitter position: center of the room, 1m above the floor
Lomba, Valadas and Duarte, 6th IEEE Intl. Symp. On Personal, Indoor and Mobile Radio Communications, Sept. 27-29, 1995, Toronto, Canada, Proc., pp.321-325
Comparison between Pure-Diffuse and Multi-Spot Diffuse (MIMO) in terms of 3-dB Optical Channel Bandwidth for a Sample Receiver Position 3.7m away
from Transmitter
3-dB BandwidthArchitecture Type Field-of-View
Diffuse
Multi-Spot-Diffuse
70 deg
10 deg
FOV1
FOV2
19MHz
23MHz
190MHz
2.4GHz
Photonic East 2000Photonic East 2000
Conclusions
• Major factors causing channel distortion- Higher order reflections- Number of diffusing spots- Diffusing spot size