Cellular Communications Laboratory

The Cellular Communications Training Systems offer an ideal technician and engineering training solution. The fundamentals of modulation techniques as applied in modern cellular communication systems are comprehensively addressed. Course trainers provide a core understanding of CDMA and GSM concepts in addition to key issues to be considered in the design of cellular networks.
The lab comprises three separate training systems, each addressing an essential aspect of the subject.

 
CELSIM - GSM Communications Simulation Software

Subjects Covered:

GSM theory:
• An Introduction to Cellular Networks
• Electromagnetic Wave Propagation
• Multiplexing of Wireless Channels
• GSM Network Components
• Operations & Maintenance Centre (interfaces and protocols)
• Speech Transmission
• Call Set-up and Mobility in GSM
• Data Transmission in GSM
• Advance GSM Topics

Simulation Exercises:

• A Guide for Solving Exercises
• Introductory Exercises (5) -  How to Use Simulation Software
• Radio Coverage
• Interference
• Relations in the Base Station (BS)
• Frequency Reuse Clusters: 4, 7, 12
• GSM TDMA Frame
• GSM Network Capacity
• Increasing Capacity through Cell Division
• Hand-over Demonstration for 4, 7 and 12 Cells in a Cluster
• Traffic Congestion
• Hand-over due to Traffic Congestion

DTR-4 - CDMA Trainer

Experiments:
• Theory of Direct Sequence Spread Spectrum Modulation and Demodulation (DSSS)
• Selection and Study of Various PN Codes (MLS, GOLD, BARKER)
• Generation (spreading) of a DSSS Modulated Signal
• Demodulation (dispreading) of a DSSS Modulated Signal
• Selection and Comparative Study of Various Code Modulation Techniques:

  BPSK/QPSK/OQPSK
• Modulation and Demodulation Using the Internal Generation of a 2047 bit PN Sequence as a Modulator Input and Un-modulated Carrier
• Spreading and De-spreading using Additive White Gaussian Noise Generator and Frequency Offset
• Perform Spreading and De-spreading using Extensive Monitoring at the Receiver for Code Lock, Carrier Lock, Carrier Frequency Offset and Code Acquisition
• Study the Effect of Synchronization - Sequential Code Search in
• De-spreading
• Voice Communication using a DSSS Concept

Structure:
• Programmable CDMA DSSS transmitter and receiver
• Simulation and Programming software
• Convenient test points for monitoring signals with a logic analyzer
• Accessories and cable set
• Student manual

DTR-16 GSM Programming

Subjects Covered:
• GSM Theory & Standards
• Understanding of GSM Technology, Networks, GSM Capability and  Data Services
• Understanding RF Environments and the Study of GSM Networks via Actual Connection to any Service Provider’s GSM Environment
• Command Level Study
• Real-time study of GSM 07.05 & 07.07 Commands in Various Categories:
• Modem Commands & SIM Card Hardware
• Network Registration Commands
• Call Control Command
• Call Setting Commands
• Call Information Commands
• Phone Book Commands
• Serial Link Control Commands
• Message Setting Commands
• Storing/Restoring Commands
• Error Message Handling and Survey
• Observe AT Commands with the Terminal Software
• Using AT Commands to Switch a Device On/Off

Structure:
• Mobile equipment (modem) for the transmission of voice and data calls, as well as SMS in a GSM network
• External antenna
• Software for viewing AT commands
• Accessories set
Requiring: SIM card and authorized access to a GSM service provider