ELECTRICAL & ELECTRONIC ENGINEERING

The Department

prospective Students

Research

Advanced Mobile Radio Techniques

Unit Title: Advanced Mobile Radio Techniques
Unit Code: EENGM2510
Year: 2011/12
Unit Organiser: Prof A.R. Nix, Prof M.A. Beach
Teaching Block: 2
Credit Points: 10

Description

This unit addresses modern wireless communication systems. The first part focuses on adaptive equalisation algorithms to receive data streams in a time-dispersive multipath channel. The material addresses filter based (LTE and DFE) and non-filter based (MLSE and Viterbi) solutions. For the filter based techniques, equaliser weight training based on zero-forcing, MMSE, LMS and RLS algorithms are covered. Convergence issues for the LMS algorithm are addressed. The use of OFDM is developed for high data rate communications in a dispersive channel. Key concepts include sub-carrier orthogonality, frequency domain equalisation and use of a guard-time. Equations to define the optimum number of subcarriers are derived. The second part addresses CDMA technologies as deployed in WLAN and 3G systems alongside a detailed examination of robust service delivery. In addition, hybrid capacity enhancement via Smart Antennas is considered in detail as well as recent advances using multiple-input multiple-output (MIMO) architectures.

Prerequisites:  EENGM2110, EENGM2100, EENGM2500

Co-requisites:  None

Learning Outcomes

Students will be able to:

  • Understand the spatial-temporal radio channel and the methods required to achieve reliable high-speed digital communications
  • Calculate LTE and DFE equaliser coefficients based on zero-forcing, MMSE and LMS algorithms
  • Understand equaliser filter weight training algorithms and convergence properties
  • Understand the MLSE and Viterbi Equaliser algorithms, including calculation of the number of states and derivation of the state transition and trellis diagrams
  • Draw OFDM transmit and receive architectures
  • Explain how the guard time protects sub-carrier orthogonality
  • Calculate the optimum number of sub-carriers for an OFDM system based on expected channel conditions
  • Understand Multipath Exploitation in DS-CDMA and its implementation by means of a Rake receiver
  • Discuss power control and handover requirements in DS-CDMA and explain their implementation alongside a sensitivity analysis
  • Understand capacity and throughput enhancement through the use of MIMO.

Elements

Part 1
Prof A.R. Nix

Adaptive Equalisation: equalisation and inter-symbol interference; linear transversal equaliser (LTE); zero forced equalisation; MMSE Weiner-Hopf Equations; Automatic equaliser coefficient calculation (steepest descent, LMS and RLS algorithms); Multi-dimensional error surfaces, Eigenvalue spread and convergence; Auto and Cross correlation matrices; Decision Feedback Equaliser (DFE); MLSE and Viterbi equalisation; Markov Processes.

OFDM: multi-carrier Transmission techniques; OFDM transmit and receiver block diagrams; use of FFT/IFFT blocks; Guard-Interval; Group Delay; Cyclical vs Linear convolution; ARQ and FEC; impact on power amplifier design. 

Part 2
Prof M.A. Beach

Spread Spectrum: definition of terms and basic modes; spreading code generation and properties; spreading codes for Multiple Access; frequency hopping basics; propagation aspects of the FH channel; FH system design; direct sequence basics; propagation aspects of DS; rake reception; power control and systems design aspects.

Smart Antennas: basic concepts of array processing; modes of operation (SFIR and SDMA); operational benefits; beam-forming architectures; impact of errors; spatial domain methods and direction of arrival; temporal domain methods; aspects of system design (FDD v TDD); TSUNAMI field trials; dual array architectures (MIMO).

Assessments

Name

Type

% of final mark

Description
Terminal Exam Exam 100 2 hour written paper

Reading List

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.

Holma, H. and A Toskala (editors), WCDMA for UMTS: Radio Access for Third Generation Mobile Communications, J. Wiley, 2002, ISBN 0-470-84467-1

Litva, J. and T. Kwok-Yeung Lo, Digital Beam-forming in Wireless Communications, Artech House, 1996, ISBN 0890067120

Molisch, A.F, Wireless Communications, 2005, John Wiley and Sons Ltd, ISBN: 9780470848883