# Unit information: Communications in 2020/21

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Unit name Communications EENG22000 10 I/5 Teaching Block 2 (weeks 13 - 24) Dr. Armour Not open None Department of Electrical & Electronic Engineering Faculty of Engineering

## Description

This unit covers the basics of digital and analogue information transfer over wired and wireless links. Topics include baseband and bandpass (M-FSK, M-PSK, M-QAM) modulation formats and associated error control coding, pulse shaping, symbol timing and carrier recovery techniques, together with bandpass analogue modulation techniques.

Fundamentals Communications:

Overview of communication systems. Factors affecting system capacity: bandwidth, noise, distortion. Quantitative metrics for Communications. Shannon's capacity theorem and bandwidth efficiency.

Baseband Digital Modulation:

PAM binary and multi-level signalling, Implications of inter-symbol interference and pulse shaping, Nyquist filters, matched filters, root raised cosine filters. Generation and interpretation of eye diagrams.

Bandpass Digital Modulation:

Introduction to the generation, detection, spectra and performance of digital modulation methods: Amplitude Shift Keying (ASK), Frequency Shift Keying (FSK), Minimum Shift Keying (MSK), Phase Shift Keying (PSK), Phase Shift Keying (DPSK). Binary and Multilevel modulation schemes. Coherent, non-coherent and differentially coherent detection methods.

Laboratory:

Modem design exercise

Error Control: Automatic Repeat Request and Forward Error Correction as strategies for error control. The pros and cons of each and the implications of error control in the context of Shannon Capacity.

## Intended learning outcomes

On completion of this unit, students should be able to:

1. Describe the fundamental limitations on the performance of communication systems
2. Evaluate the performance of communications systems both qualitatively and quantitatively
3. Calculate the theoretical capacity of a channel as a function of bandwidth and SNR
4. Apply engineering trade-offs in using different modulation techniques and be able to select appropriate techniques for different applications
5. Outline the practical challenges associated with different modulation methods
6. Apply the above to design, implement and evaluate a communications modem and compare theoretical capacity and practical system capabilities.

## Teaching details

Teaching will be delivered through a combination of synchronous and asynchronous sessions, including lectures, practical activities supported by drop-in sessions, problem sheets and self-directed exercises.

## Assessment Details

Formative: Lab Assessment & Online Test 1

Summative: Timed Assessment (May/June) (100%)