The Design of Downlink Radio Access Point for Radio Over

Fiber System For LTE Applications

Mohamad Yusri Bin Yacob51210111088

Final Year Project Degree Sem 1 S2’12

2012 Final Year Project 1 University Kuala Lumpur British Malaysian Institute

Presentation Content

i. abstractii. objectiveiii. Introductioniv. Problem Statementv. Literature Reviewvi.Methodologyvii.Expected Resultviii.Conclusionsix.References

ABSTRACT

• Radio over fiber is becoming an increasingly important technology for the in building wireless market.

• The LTE is a standard for wireless data communications technology and an evolution of the GSM/UMTS.

• The aim of this project is to design the radio access point via an optical fiber for LTE.

• OptiSystem is used to perform the simulation of the whole system designed.

OBJECTIVE• To design the downlink radio access point (RAP) for

radio over fiber system (RoF) for LTE applications.• To simulate the downlink radio access point (RAP) for

radio over fiber system (RoF) for LTE applications using OptiSystem software.

• To analyze the performance of Signal Noise Ratio (SNR) for the RAP In downlink transmission.

INTRODUCTION• The ability to communicate with the people on the move has

envolved remarkable since 1987.• Recently,there is no accurate frequency for LTE.• Nowadays, the radio frequency spectrum is congested, and

the provision of broadband services in new bands is increasingly more difficult.

• To support a very high data rate, the cell size must be reduce.• To provide a good service quality of coverage, we need to

place more base station at a central station with a distributed antenna system.

PROBLEM STATEMENT

• Increasing number of users.• Low speed of data transmission.• High cost of Base station.• High attenuation of coaxial cable.• No coverage in “Dead Zone” area.

PROBLEM STATEMENT

Figure 1: Optical link for dead zone

LITERATURE REVIEW

• Engineering of fiber optics infrastructure authored by R. Pirich.

• On the performance of LTE 4G authored by lahetkangas and Eeva.

• Radio over Fiber Technologies for Mobile Communications Network authored by Hamed Al- Raweshidy and Shozo Komaki.

LITERATURE REVIEW

http://users.encs.concordia.ca/~gcowan/research_linearizedROF.html

Downlink Transmission

Uplink Transmission

Figure 2: Radio Over Fiber Architecture

METHODOLOGYLiterature study on Radio Over Fiber Technology

Optical Fiber SystemRadio frequency (RF) & Antenna

system

Study to using programs which involve in design and simulation

Optiwave Optisystem

Modeling the S-parameter from measured factory database and simulate the whole system using Optisystem

Analyze the performance of Signal Noise Ratio (SNR) for downlink signal

Figure 3: Flow chart of the project

METHODOLOGY The architecture of downlink radio over fiber for LTE application will be

design by using OptiSystem software.

QAM Modulator

Rx ModelRF SubsystemOpticalSystem

Central Base Design (CBS)

End UserRadio Access Point (RAP)

Figure 4: Design of Downlink Radio Over Fiber

METHODOLOGY • Basic block diagram

RF inputSignal

Modulator2.6 GHz

LaserPower

AmplifierFilterPhotodiode

AntennaFiber Optic

Downlink Transmission

Figure 5: Downlink Transmission Block Diagram

METHODOLOGY• Design Specification for Downlink RoF for LTE

application as below:

Table 2: Design Specification

Design Specification Value

Radiated power (max) <30dBm (1w)

Sensitivity (min) >-65dBm

Maximum Range >100m

Frequency 2.6GHz

Laser frequency 1550nm

Modulation technique 64 QAM

Fiber optic length >10km

METHODOLOGY

• Link Budget consist of the useful signal power available at every stage of the design goal.

• It is a balance sheet of gains and losses through the link.

Table 1: Link Budget & Design Specification  RF

ModulatorLaser Photodiode Pre-

FilterFinal

AmplifierPost

AmplifierPost

FilterAntenna Radiated

PowerSensitivity Maximum

Range

Input power (dBm)

0 0 10 -20 -32 3 38 26

<30 dBm

Or

<1 Watt

>-65 dBm >100m

Output power (dBm)

0 10 -20 -32 3 38 26 30

Gain (dBm) 0 10 0 0 35 35 0 4

Losses (dBm) 0 0 30 12 0 0 12 0

Expected Result

Figure 7: Signal to noise ration (SNR)

http://www.sciencedirect.com/science/article/pii/S0030401812005135

Signal Noise Ratio

METHODOLOGY Basic process flow chart for the project

Project Title: Downlink Radio Access Point for Radio Over Fiber system For LTE 4G applications.Milestone against timeline S2’12 S1’13

 Project Activities

   

2 3 4 5 6 7 8 9 10 11 1 2 3 4 5 6 7 8 9 10 11 12 13 14

Research Title                                                

Finding information                                                

Submit title to advisor                                                

Literature Review                                                

Theoretical study of Rof                                                

Theoretical study on BPF and antenna                                                

Theoretical study on power amplifier                                                

Overall system study                                                

Finding and study about software                                                

Presentation                                                

Submit Proposal                                                

Learning OptiSystem Software                                                

List the link budget                                                

Study the s’2 parameter                                                

Get the s’2 parameter from factory                                                

Design the downlink Radio Access Point                                                

Simulation the whole system                                                

Analyse system performance result                                                

Report Writing                                                

Presentation Result                                                

Submit Report                                                

Figure 6: Gantt Chart of the project

CONCLUSIONS• The downlink radio access point (RAP) for radio over fiber

system (RoF) for LTE applications will be design.

• The downlink radio access point (RAP) for radio over fiber

system (RoF) for LTE applications will be simulate using

Optisystem.

• The performance of signal noise ratio (SNR) for downlink

transmission will be analyze using optisystem software.

REFERENCES• A. Goldsmith, Wireless Communications. Cambridge, U.K.:

Cambridge Univ. Press, 2005.• “Optisystem” By Optiwave system, inc ,Published 2008,

Optiwave system inc.• “Microstrip Patch Antennas: A Designer's Guide” By Rodney B.

Waterhouse, Published 2003 Springer.• Istvan Frigyes, “Basic Microwave Properties of Optical Link”

In: Hamed Al- Raweshidy, Shozo Komaki. Radio over Fiber Technologies for Mobile Communications Network. : Artech House Inc., USA, 2002.

• “Engineering of Fiber Optics Infrastructures” By r. Pirich, May 2012 IEEE Long Island.

• “On the performance of LTE 4G” By lahetkangas and Eeva. European Wireless, April 2012. EW. 18th European Wireless Conference.