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Radio over Fiber Distributed Antenna Systems for Wireless Communications

Bruce ChowCorning Incorporated

[email protected]

Wireless & Optical Communications Conference

April 23-24 Taichung, Taiwan

OWAN Workshop, APOC 2007Science & Technology

Outline

• Introduction: Radio over Fiber (RoF)

• Multiple Services over Fiber

• Indoor Application: WiFi Network demonstrator

• Outdoor Applications: Distributed Antenna System for Corridors


Radio over Fiber

Head-endcontroller

Head-endcontroller

Wireless Access Point

EO EOFiber optic link

Conventional, distributed network electronics

Centralized networks electronics


Large Range for Optically Transported RF Signals

Preamplifier Gain (dB) 38

Preamplifier Noise Figure (dB) 2.9

Postamplifier Gain (dB) 25

Laser Bias Current (mA) 8

Laser Slope Efficiency (W/A) 0.075

Detector Responsivity (A/W) 0.65

Laser RIN (dBc/Hz) -137.7

Laser OIP3 (dBm) 16

TIA eff. noise density (pA/ ) 10

Component parameters used for spurious free dynamic range calculation

Hz

Feasible transmission distances over various fiber types at 5.8 GHz and SFDR of 95 dB·Hz2/3

850 nm OM2 MMF 80 m

850 nm OM3 MMF >300 m

1300 nm single-mode fiber 38.7 km

1550 nm single-mode fiber 67.7 km


RoF Advantages

WiFi

In-building cellular

Lighting control

HVAC control

PDA

RFID badge tracking

• Easy deployment of many access points or distributed antenna• Fiber can support multiple wireless services at different frequencies• Services added and controlled at centralized hub


Indoor RoF Application: Indoor WiFi

• Bandwidth shared by many users• Dead spots• Coverage out of the building

• Bandwidth for few users• Ubiquitous coverage• No out-of building leakage

Current trend is going from largerto smaller, higher BW cells


Indoor WiFi Applications

4m8m16m4 users4 users

14 users14 users56 users56 users

Large WiFi cells can have poor performance in office environments


Conference Room on a Busy Day

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t im e 1 2 :3 0 1 6 :3 0 1 0 :0 0 1 3 :1 5 1 3 :3 0 1 7 :1 5 0 8 :3 0 1 1 :0 0 1 3 :3 0 0 8 :3 0 1 3 :3 0A P #

1 1 1 1 1 2 2 2 11 2 1 1 1 2 1 3 1 11 31 4 1 1 3 5 4 41 5 1 1 1 2 1 1 3 1 11 6 1 1 12 1 2 2 2 3 2 2 12 2 1 2 1 2 12 32 4 1 4 22 5 1 2 12 6 13 13 23 3 2 2 1 1 13 4 1 1 1 23 5 2 1 13 64 1 3 1 1 1 14 2 1 1 24 3 1 1 2 2 14 4 3 2 2 1 2 2 1 2 2 34 5 1 24 6 3 2 1 2 1 3 65 1 6 8 1 8 7 2 25 2 1 7 3 5 6 6 3 25 3 15 4 15 5 3 2 1 2 4 6 5 8 85 6 4 3 3 6 4

to ta ls 2 6 1 3 9 7 3 8 3 5 2 2 4 3 4 5 3 1 3 0


30-cell demonstrator network (WLAN over MMF)80m

70m

Server Room

LayoutHead-end Implementation

Can be fully integrated into compact central WLAN switch


Rapid deployment: multiple antennas, one cable run

PicocellTransponder

HVAC Ducts

SprinklerFluorescent Lights

Ceiling Cavity

Pre-fabricated optical fiber antenna array cables pulled into ceiling cavity


Multiple cell fiber-radio WLAN installation

Cable feeding remote antennas

Fiber Interconnect Housing

Backbone Cable

Cable to antennas

Antenna Transponder


Example of antenna transponder implementation

MMF downlink

Antenna cables

Electrical powerTOSAMMF uplink

ROSA


Outdoor Application: Coverage for Narrow Corridors (Roads & Tracks) in Difficult Terrain


Outdoor Application: RoF Distributed Antenna System Deployed Along Corridor

Service


Summary

• Radio over Fiber can provide multiservice solutions

• Indoor deployment and management can be easier than traditional wireless deployments

• Long range transport of signals good for extending coverage along corridors

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