ORC Seminar Series
"OFDM: Myths, realities and signal-processing challenges in optical and wireless communications"
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Speaker: Professor Lajos Hanzo, School of ECS - University of Southampton
Date: Wednesday 30th July 2008
Time: 2pm
Venue: Lecture Theatre B, Building 46
Abstract:
This light-hearted overview is based on an amalgam of references [1]-[4] (see below), speculating on the pros and cons of multicarrier modulation in various communications scenarios. Following a brief portrayal of the fundamental OFDM versus MC-CDMA principles we continue by demonstrating that OFDM modems can be efficiently implemented by invoking the Fourier transform or the fast Fourier Transform (FFT). A number of basic OFDM design issues are discussed in an accessible style, including the effects of dispersive non-linear channels and pilot-based channel estimation, peak-to-mean modulated signal amplitude aspects and the impact of signal-clipping introduced by finite dynamicrange amplifiers, concluding by considering the performance benefits of adaptive modulation.
1. REFERENCES
[1] L. Hanzo, S-X. Ng, W.T. Webb, T. Keller: Quadrature Amplitude Modulation: ¿From Basics to Adaptive Trellis-Coded, Turbo-Equalised and Space-Time Coded OFDM, CDMA and MC-CDMA Systems, IEEE Press-John Wiley, 2nd edition, Sept. 2004 1105 pages.
[2] L. Hanzo, T.H. Liew, B.L. Yeap: Turbo Coding, Turbo Equalisation and Space-Time Coding, John Wiley, August 2002, ISBN 0-470-84726-3, p 766
[3] L. Hanzo, M. M¨unster, B.J. Choi and T.Keller: OFDM and MC-CDMA for Broadband Multi-user Communications, WLANs and Broadcasting, John Wiley - IEEE Press, May 2003, 1010 pages
[4] L. Hanzo, L-L. Yang, E-L. Kuan and K. Yen: Single- and Multi-Carrier CDMA: Multi-User Detection, Space-Time Spreading, Synchronisation, Standards and Networking, IEEE Press - John Wiley, June 2003, 1060 pages