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University Of Tripoli
Faculty Of Engineering
Electrical & Electronic Engineering Department
Two Way Satellite Internet Using Ka-Band
Prepared by :
Wisal Ali Saleh Ihnish
Supervised by :
A decided advantage of satellite network over terrestrial fixed network is a multipoint connectivity. A two-way satellite internet is one of applications of telecommunication satellite services that works as multipoint interactive , and can offer high data speeds up to 18 Mbps by a small diameter antenna when using ka-band.
In this project , a two way satellite network that works by DVB-S2 technology , MF-TDMA in Return Link and the design procedures for two- way network is discussed , and used Matlab program to determine the antenna diameter for VSAT Terminal , transmit Power required to know available BUC and the Required bandwidth in Return and Forward link for both dedicated and shared services . however this leads us to the case study .
Finally a conclusion and some future work as an extension of this work is proposed.
Project Topics :
Two Way Network Architecture
Design And Analysis
Sizing , Dimensioning And Cost Estimation Of A Two Way Internet Connectivity Via Ka-Band Satellite Services
Objectives Of The Project
Organization Of The Project
* Satellite Services
*Frequency Band Desination
*General Features Of Satellite Network
1. To review some of principles of satellite communication systems .
2. To study the new satellite internet services ( Two-Way) .
3. To study the link design .
4. To consider the new technologies to the satellite .
5. To design a utilized link for libya .
Letter band designation
Fraquency band dsignation
by a wavelength
Configuration of satellite communication system
Network Architecture with DVB-S2-RCS-ACM
Carrier in Carrier Technology
Table 2.1 Microwave Ku-band vs. Millimeter wave Ka-band
Bent Pipe transponders
Satellite Link Design
Carrier to Noise Ratio
Bit Error Performance
Matlab Link Design Program
Free Space Path Loss
EIRP of earth station
Figure of merit of satellite
EIRP of satellite
Figure of merit of earth station
Design Procedures :
General conclusions :
1.The largest required power transmit is obtained at the user terminals which have high upstream speed from 0.15 watt for 128Kbps to 3.7 watts for 4096 Kbps .
2.When the Hub station antenna diameter and power transmit increase the user terminal antenna diameter will decrease.
3.The user terminal power will decrease as the Hub station G/T increase.
4.When the required Eb/N0 total increase at terminal the antenna diameter will also increase.
5.The users that have a dedicated services will be assigned a specific unshared satellite bandwidth .
6.The users that have a shared services will share a specific assigned satellite bandwidth by a Contention ratio (N: 1) .
Conclusions from the case study :
1.With Two-way Satellite Internet you can connect your network anywhere, anytime , a round the satellite coverage , with high speed, security, reliability and quality.
2.With using ka-band , smaller diameter antenna compared to Ku-band can be used .
3.DVB-S2 helps to overcome the power and bandwidth limitations.
4.DVB-S2 has four modulation constellations (QPSK, 8PSK, 16APSK and 32APSK)
5.Using MF-TDMA in DVB-RCS systems , the number of channels increases.
6.Double Talk Carrier-in-Carrie’Technology provides a significant improvement in bandwidth utilization.
Future Work Recommendation :
1. Development of Matlab program to calculate the link budget for any satellite and sites.
2. Conducting a study using Multifrequency TDMA (MF-TDMA) and using CIC.
Gaseous Attenuation .
Cloud and Fog Attenuation.
Atmospheric Effects .
Results for DedicatedService
Results for Shared Service