Current Status of Radio Wireless...
7
Current Status of Radio Wireless Communication Limited bandwidth Interference How to use the limited bandwidth more efficiently or find other communication media How to prevent radio interference Limited bandwidth Share Base station Relay station Microwave oven Pace maker
Transcript of Current Status of Radio Wireless...
Current Status of Radio Wireless Communication § Limited bandwidth
§ Interference
q How to use the limited bandwidth more efficiently or find other communication media
q How to prevent radio interference
Limited bandwidth
Share
Base station
Relay station Microwave oven
Pace maker
Future Vision of Optical Wireless Communications (OWC)
§ For long distance communications, an communication link is mostly implemented using infrared
laser light . Developments in outdoor free space optical communication are limited by Point-to-Point wireless link
§ There are many applications witch need Point to Multi-Point communication (e.g. IPTV broadcast system)
The Problems of Outdoor Communication
Point-to-Point Connection
q How to find a solution to make the light go in different directions Chapter 3
The Problems of Indoor Communication
§ For indoor optical wireless communication system, diffused links is mostly implemented to make the system more robust
q How to find a solution to achieve a power efficient communication avoiding interference between different transmitters
q How to compile the optical wireless system and current radio system and how to have flexibility in deploying the system
Proposed System Model Station A
Fixed Reflector Array Optical Wireless Head
Station B Station C
Hub Station
Rotating Reflector Remote Station
Fixed Reflector C
Fixed Reflector A
Fixed Reflector B
Motor
SD/TDMA ;
Space Division/Time Division Multiple Access
Optical Wireless Head
Measurement System
APD LD
E/O LD APD
O/E
AGC E/O
E/O O/E
Received Level Monitor
Error Detector
O/E
Pattern Generator
Wave Length : 780nm, 830nm
Maximum Throughput : 156Mb/s
Transmit Distance : 2000m（max）
AGC : Automatic Gain Control Amplifier
APD : Avalanche Photo Diode
LD : Laser Diode
E/O : Electric-to-Optic Converter
O/E : Optic-to-Electric Converter
Hub station Remote station
Experiment Set-up
Motor Controller
Optical Wireless Transceiver
Stepping Motor
Fixed Reflector Array
Rotating Reflector
Fixed Reflector Array Rotating Reflector
Operation Device
