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Mobile Communications (M)
Unit information: Mobile Communications (M) in 2019/20
Please note: Due to alternative arrangements for teaching and
assessment in place from 18 March 2020 to mitigate against the restrictions in
place due to COVID-19, information shown for 2019/20 may not always be accurate.
Please note: you are viewing unit and programme information
for a past academic year. Please see the current academic year for up to date information.
| Unit name |
Mobile Communications (M) |
| Unit code |
EENGM2500 |
| Credit points |
10 |
| Level of study |
M/7
|
| Teaching block(s) |
Teaching Block 1 (weeks 1 - 12)
|
| Unit director |
Professor. Andrew Nix |
| Open unit status |
Not open |
| Pre-requisites |
EENG22000
|
| Co-requisites |
None
|
| School/department |
Department of Electrical & Electronic Engineering |
| Faculty |
Faculty of Engineering |
Description including Unit Aims
A summary of the various frequency bands and systems in use today is provided. Radiowave propagation is then discussed, covering path-loss, antenna gain, multipath, shadowing and fast fading. System link budgets are developed. Fast fading models are derived and, using the central limit theorem, Rayleigh and Rician distributions are derived. Time dispersion and the impact of inter-symbol interference is introduced. Spaced-time and spaced-frequency correlation functions are derived. The impact of propagation on digital modulation is explained. The Level Crossing Rate and the Average Fade Duration are derived. QPSK and GMSK modulation formats are reviewed with emphasis placed on practical issues, such as synchronisation, band-limiting and the impact of non-linear power amplifiers. Diversity techniques are studied to improve fading performance. Cellular design is presented covering issues such as co-channel interference, frequency re-use, cluster size and handover. The basic cellular radio design equations are developed for capacity and coverage prediction. To reflect the level of the unit, a 3-hour laboratory session (followed by a detailed design report) is required based on radiowave propagation planning and analysis in an indoor environment. This laboratory is based on the use of an industrial propagation modelling tool.
- Propagation Principles and Statistics:
Rayleigh and Rician fast fading amplitude and phase variations; K-factor; Frequency selective fading, power delay profiles; RMS delay spread, coherence bandwidth and intersymbol interference; Modelling the fast fading envelope; Link Budgets; Level Crossing Rates and Average Fade Duration; Irreducible error rates; Normalised Doppler Spread and Normalised rms Delay Spread.
- Modulation and Diversity:
QPSK (offset, non-offset and pi/4); Coherent/differential detection; Impact of non-linear amplification; GMSK; Differences between QPSK and GMSK; Generating diversity signals; Switched and selection diversity; Equal gain and maximal ratio combining; Analysis of CT2 (TDMA-TDD) with diversity
- Cellular Design and Capacity:
Achieving continuous coverage; Frequency re-use, handover and cluster size; Reuse ratio (D/R); Relationship between cluster size (N) and C/I protection ratio; Calculating cellular capacity, Erlangs; Microcellular networks, future capacity issue
|
Intended Learning Outcomes
- Explain mobile radio propagation theory
- Develop Matlab models for multipath fading
- Derive and compute radio link-budgets
- Describe how the radio channel distorts digital communications
- Explain how diversity can be used to enhance mobile performance
- Explain the practical differences between GMSK and QPSK
- Design cellular networks based on FDMA and TDMA systems
- Calculate network capacity in terms of subscribers per square kilometre
- Compute the frequency re-use factor as a function of the co-channel protection ratio
|
Teaching Information
Lectures
Assessment Information
Exam, 2 hours, 100% (ILOs 1-9)
Reading and References
- Parsons, J.D., The Mobile Radio Propagation Channel,2nd Edition, J. Wiley, 2000, ISBN:978-0-471-98857-1 Highly Recommended for part 1.
- Proakis, J., Digital Communications, 4th Edition, McGraw-Hill, 2000, ISBN:0071181830.
- Sklar, B., Digital Communications: Fundamentals and Applications, 2nd Edition, Prentice Hall, 2001, ISBN:0130847887.
- Haykin. S., Communication Systems, 4th Edition, John Wiley, 2000, ISBN:0471178691.
- Rappaport. T.S., Wireless Communications: Principles and Practice, 2001, ISBN:0160422320.
- Macario, R.C.V., Cellular Radio, 1997, ISBN:0070444331.
