- Overview and discussion of Wireless (Data) Systems in Germany,
- Evolution of systems, spectrum allocations for mobile services. Security
- Telephony
- Cellular Telephony
- GSM: Radio standard (Basic principles explained as a fairy tale), Business aspects, Network
- U.S. cellular telephony: analogue AMPS, digital IS 54 and IS 95. PCS
- Japan: PDC
- IMT 2000 (FLPMTS), UMTS
- Cordless telephony
- Digital Enhanced Cordless Telephone (DECT)
- Cellular Telephony
- Broadcast Systems
- broadcast standards,
- Radio Data System (RDS/RBDS)
- Digital Audio Broadcasting (DAB), Digital Radio Mondiale (DRM)
- Digital Video Broadcasting
- DVB / DTTB
- copyright protection and conditional access: General description of pay TV Pay TV and storage devices - Copy(right) protection Hardware for cryptographic protection Overview of existing conditional access video broadcast systems
- MVDS Microwave distribution, "wireless cable"
- broadcast standards,
- Data and Multi-Media Systems
- Wireless LANs and ISM bands, IEEE 802.11, IEEE 1394, HIPERLAN, Bluetooth, Zigbee, Windflex
- Broadband Wireless Multimedia Systems, U.C. Berkeley Infopad (broadband CDMA design)
- Mobile (macro-cellular) data networks
- CDPD: Network Architecture, Protocol issues for Mobile Station, Base Station, Intermediate System: Channel Sniffing, Handover, Roaming.
- Wireless Data Systems in Germany
- Paging
- Wireless Computing, software downloading, software radios
- Packet Radio
- Satellite Systems: geo stationary, IRIDIUM and Very Small Aperture Terminal (VSAT) systems
- Wireless infrared
- Road Transportation Informatics, Communication for IVHS and AVCS, Digital Short Range Communication DSRC
Analog electronics and RF front ends (under preparation at CWT/e)
Wireless Propagation Channels
- Large scale and small scale propagation mechanisms
- Path loss propagation models
- Free space loss
- Plane earth loss, ground reflections
- Diffraction
- Shadowing, joint effect of multiple interferers.
- Multipath Fading
- Wide Sense Stationary Uncorrelated Scattering (WSSUC)
- Scatter function, SRCM model
- Rayleigh fading
- PDF of amplitude and power
- Doppler spectrum, rate of fading, random FM
- Threshold crossing rate TCR and average fade duration AFD
- Delay spread and coherence bandwidth
- Samples of typical Rayleigh channels
- Channel simulation methods, Java phasor animation
- Rician fading
- Nakagami fading
- PDF of power,
- Using a Nakagami model to approximate Rician fading
- Path loss propagation models
- Channel Models
- Macro cellular channel
- Micro-Cellular channel
- Indoor channel at 2.4 GHz, 5 GHz, 17 GHz, 60 GHz, infrared
- Indoor Radio wave Propagation Measurements and Stochastic Channel modelling
- vehicle-to-vehicle channel
- Reciprocity of uplink and downlink.
Cellular Telephone Networks
- Systems and Standards: see above.
- Radio Resource Management
- Cellular frequency reuse, cell sizes, practical aspects of cell planning
- Multiple access: FDMA, TDMA, CDMA, SDMA
- Cell sectorization, reuse partitioning, dynamic channel assignment (DCA)
- Digital Speech Interpolation (DSI)
- Fixed and Dynamic Channel Allocation
- Link Quality Performance Evaluation and Network Performance Analysis
- Protection ratio, Outage probability, useful expressions, computer methods.
- Man-made noise and link-budget
- Cumulation of interference: Nakagami fading, method by Schwartz & Yeh
- Call blocking, speech clipping, subjective speech quality, Erlang B and C formulas
- Spectrum efficiency versus performance
- Network Aspects
Analog and Digital Transmission
- Modulation methods. BPSK, DQPSK, FSK, GMSK, QAM
- Effects of fading and dispersion (for analog and digital)
- Noise: AWGN and matched filters
- Bit error rates
- Multicarrier modulation and OFDM;
- Intuitive and mathematical description
- frequency domain channel simulation
- OFDM for DTTB
- Spread spectrum
- Direct sequence transmission
- Selection of spreading codes
- Synchronization acquisition and tracking
- RAKE receiver, Multiuser detection, Antenna array processing
- Power control
- CDMA for packet data: Performance
- Frequency hopping
- Orthogonal Multi-Carrier CDMA, CDMA/OFDM
- Receiver aspects: subcarrier weighing
- Hybrid DS/FH Spreading CDMA
- Wideband channel models: resolvable paths, multipath self-interference,
- Direct sequence transmission
- Reeiver techniques
- Basic principles of GSM explained as a fairy tale: The Story of Big Solitude and Mostly Silent
- Diversity techniques
- Selection diversity, Equal Gain Combining, Maximum Ratio Combining
- Interference Rejection Combining (Smart antennas), CDMA Array Processing
- Coding
Wireless Data Networks
- Wireless data networking. How does it differ from digital telephony?
- Data systems and concepts: see Systems and Concepts.
- Queuing delay in cellular data networks
- Random access
- Methods and principles
- ALOHA
- Throughput
- Drift of Backlog, Stability, Dynamic Frame Length
- Cellular ALOHA Networks, Frequency Reuse and ALOHA
- Direct Sequence spreading in random access radio
- CSMA
- ISMA (busy tone feedback)
- Collision resolution schemes:
- Adaptive retransmission backoff
- Stack algorithm, Tree algorithm
- Dynamic Frame Length ALOHA
- Spatial Collision Resolution
- Access reservation schemes: PRMA, STRMA
- ALOHA
- Performance Analysis
- Throughput versus Offered Traffic
- Receiver capture, vulnerability to interference
- Stability and delay
- Spatial distribution of packet traffic
- Diversity in random access networks
- Methods and principles
Business and Regulatory Aspects
- The technical issues in wireless communication, the problem of user mobility
- History; Evolution of systems towards PCS
- Economics of wireless access:
- The last mile,
- The cost of cellular phones and business models of operators.
- The market value of the radio spectrum
- Example of tariffing in GSM
- Success factors for innovations in information services
Capita Selecta
- Glossary and Acronyms
- on wireless communication (The buzz words)
- on video and television
- Road Traffic Informatics
- List of main mathematical symbols
- Companies active in Wireless and Cellular
- Organizations and Standards
- Historical setting
- Research directions in Propagation; Wireless Computing
- Electronic Watermarking (an application of spread spectrum in image processing)
Slides, Presentations and References
Courses, Presentations
educational tools and exercises.Have a look at the wireless communication quizzes or the radio link design exercise.
The glossary helps you to rapidly acquire the buzz words of this field.
See an animated SMIL overview or a word of welcome plus a selection of audio fragments from interviews featured.
Playlists provide a selection of longer audio clips, talks and interviews.
Acrobat Course Slides
- Fundamentals
- System Issues
- System Concepts and Standards
- Transmission Aspects
- Macroscopic Propagation Mechanisms
- Microscopic Propagation Mechanisms (Multipath)
- Diversity
- Modulation methods
- Man Made Noise
- Power Control
- Research Projects;
Powerpoint® slides
- UMTS by Raul Bruzzone HTML pointer
- Propagation: Basics, Intermediate, Advanced
- Bluetooth (HTML)
- History (HTML)
- RF front/end tutorials : design basics, imperfections
Exercises and educational tools
- Quizzes
- Radio link design exercise.
- Path loss exercise
- Aloha collision resolution exercise
- Channel assignment game
Further reading
Postscript® and Acrobat PDF® printable documents
- Overview of large-scale propagation models (PS; PDF)
- Statistical Propagation models (PS; PDF)
- Rician and Rayleigh fading
- Outage Probabilities (PDF)
- Delay in Cellular Networks (PDF)
- Direct sequence CDMA
- Multi-Carrier CDMA: discussion (PS/PDF) and slides (PDF)
- Turbo coding and OFDM (PDF 1, 2, 3)
- Road Traffic Informatics
- Vehicle-to-vehicle channel model: theory and measurements
- Vehicle-to-vehicle links
- Base-to-vehicle communication
Recommended Books and Papers
- Overview of text books
- Evolution of Wireless Systems
- Wireless Services
- Pricing (and economic models used in system control)
- Road Traffic Informatics
- Cellular Systems
- Propagation
- Transmission aspects
- Packet Data
- Wireless Access
- Random Access: ALOHA, CSMA
- Collision Resolution
- Wireless Internet (IP) Protocol
- Networks
Computer Programs
Programmers Guidelines and Hints
- Hints for program to compute Outage Probability in cellular network with Rayleigh fading, shadowing and path loss. (see also Javascript)
MS DOS and Windows® EXE files
- PROMOT Planning Tool for gathering telemetric data (DOS Executable).
- STRMA Space - Time Reservation Multiple Access (PC Windows Executable)
- Watermark correlation detector for digital images. (Description, executables)
Java® Applets
- Phasor diagrams for Rayleigh fading.
- Phasor diagrams for AM, NBPM and FM modulation.
- Calculator in design exercise.
- Viterbi decoding
- Dynamic Channel Assignment (DCA), BDCL
JavaScript® Embedded Calculators, Spreadsheets
- Time constants of Rayleigh fading, average fade duration, Doppler spread, level crossing rate
- Link budget
- Free space loss
- Egli's path loss model
- Path loss, incl. Egli, Hata
- Indoor path loss
- Single knife edge diffraction loss
- Erlang B
- Spectrum efficiency
- Outage probability:
- Comprehensive: Rayleigh fading, shadowing
- Rician fading
- Gold sequences: crosscorrelation
- PDF of Power sum of multiple lognormal signal
- Effective throughput, packet length
- Bit Error Rate
Animations, Quizzes, Exercises, Games
- Maximum length PN sequence generator
- Multiple choice quiz
- Quiz played as a boardgame
- Radio link design exercise
- Random Erlang traffic
- Dynamic Channel Assignment game.
- Dynamic Channel Assignment Gilbert-Elliot two-state channel model.
- ALOHA game.
Matlab® Code
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