Chair of Mobile CommunicationsProfessor Harald Haas

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The University of Edinburgh
The King's Buildings
Edinburgh EH9 3JL




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TED Global 2011

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Professor Harald Haas

Chair of Mobile Communications

School of Engineering, University of Edinburgh

Read about my Research, Li-Fi, and the future of Mobile Communications.

Recent Posts from Professor Harald Haas:

  • Invited Paper

    This is a pre-print of an invited paper at SPIE Photonics West, 1-6 February 2013

  • PhD Projects

    I have announced a number of new PhD projects under Vacancies!

  • Latest JLT Paper

    Complete Modeling of Nonlinear Distortion in OFDM-based Optical Wireless Communication

    A pre-print is available for download.


    This paper presents a complete analytical framework for modeling memoryless nonlinear effects in an intensity modulation and direct detection optical wireless communication system based on orthogonal frequency division multiplexing. The theory employs the Bussgang theorem, which is widely accepted as a means to characterise the impact of nonlinear distortions on normally-distributed signals. The current work proposes a new method to generalise this approach, and it describes how a closed-form analytical expression for the system bit error rate can be obtained for an arbitrary memoryless distortion. Major distortion effects at the transmitter stage such as quantisation and nonlinearity from the light-emitting-diode are analysed. Four known orthogonal-frequency-division-multiplexing-based modulation schemes for optical communication are considered in this study: direct-current-biased optical OFDM, asymmetrically clipped optical OFDM, pulse-amplitude-modulated discrete multitone modulation, and unipolar orthogonal frequency division multiplexing.

  • Best Paper Award at VTC Fall 2013 Las Vegas 2 5 September 2013

    A. Younis, W. Thompson, M. Di Renzo, C.-X. Wang, M. A. Beach, H. Haas and P. Grant, "Performance of Spatial Modulation using Measured Real-World Channels", VTC-Fall, 2013, 2-5 September 2013.

    A pre-print can be downloaded.

  • IEEE Proceedings Paper on Spatial Modulation

    Spatial Modulation for Generalized MIMO: Challenges, Opportunities and Implementation

    A pre-print is available for download.


    The key challenge of future mobile communications research is to strike an attractive compromise between wireless network's area spectral-efficiency and energy-efficiency. This necessitates a clean-slate approach to wireless system design, embracing the rich body of existing knowledge especially on Multiple-Input-Multiple-Output (MIMO) technologies. This motivates the proposal of an emerging wireless communications concept conceived for single-RF large-scale MIMO communications, which is termed as Spatial Modulation (SM). The concept of SM has established itself as a beneficial transmission paradigm, subsuming numerous members of the MIMO system-family. The research of SM has reached sufficient maturity to motivate its comparison to state-of-the-art MIMO communications, as well as to inspire its application to other emerging wireless systems such as relay-aided, cooperative, small-cell, optical wireless and power-efficient communications. Furthermore, it has received sufficient research attention to be implemented in testbeds, and it holds the promise of stimulating further vigorous inter-disciplinary research in the years to come. This tutorial paper is intended to offer a comprehensive state-of-the-art survey on SM-MIMO research, to provide a critical appraisal of its potential advantages, and to promote the discussion of its beneficial application areas and their research challenges leading to the analysis of the technological issues associated with the implementation of SM-MIMO. The paper is concluded with the description of the world's first experimental activities in this vibrant research field.

  • IEEE Webinar

    I will be giving an IEEE Webinar entitled: "Li-Fi: High Speed Wireless Communications via Light Bulbs".

    Wednesday, 19 June 2013 at 10:00am (BST).

    Free registrations can be made online.

    The presentation can be download.

  • High Speed Wireless Networking Using Visible Light

    A new article has been publishedd in the SPIE newsroom.

  • Li Fi at the Edinburgh Science Festival

    Professor Harald Haas' Li-fi talk at the Edinburgh International Science Festival.

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