Novel broadband applications that are foreseen in the future require a bandwidth in excess of 2 Mb/s. Although wireless communication has emerged as a formidable option in overcoming the last mile problem in transmitting such high data rates, its widespread use is limited due to the severe multipath effects present especially in the urban areas. Multitone modulation systems, such as OFDM promises to be an elegant and efficient method to overcome the limitations of multipath over traditional single carrier systems such as QPSK. My research interests lie in the design of multitone systems such as OFDM systems and other designs of filter bank based multitone modulation schemes. I have looked into frequency offset and timing synchronisation, mitigation of phase noise as well as channel shortening algorithms and channel equalisation.

1. V. S. Abhayawardhana, I. J. Wassell, D. Crosby, M. P. Sellars, M. G. Brown, "Use of Random Building Height Model for Fixed Wireless Access Systems in Urban and Suburban Environments," 14th IST Mobile and Wireless Communications Summit (IST 2005), Dresden, Germany, Jun 2005

2. D. Crosby, V.S. Abhayawardhana, I.J. Wassell, M.G. Brown, M.P. Sellars, "Time Variability of the Foliated Fixed Wireless Access Channel at 3.5 GHz," 61st IEEE Vehicular Technology Conference, Stockholm, Sweden, May 2005

3. V.S. Abhayawardhana, I.J. Wassell, D. Crosby, M.P. Sellars, M.G. Brown, "Comparison of Empirical Propagation Path Loss models for Fixed Wireless Access Systems," 61st IEEE Vehicular Technology Conference, Stockholm, Sweden, May 2005

4. Viraj S. Abhayawardhana, "Investigation of OFDM as a Modulation Technique for Broadband Fixed Wireless Access Systems," PhD thesis, May 2003

5. V.S. Abhayawardhana, I.J. Wassell, "Common Phase Error Correction with Feedback for OFDM in Wireless Communication," IEEE Global Communications Conference (GLOBECOM 2002), Nov 2002

6. V.S. Abhayawardhana, I.J. Wassell, "Iterative Symbol Offset Correction Algorithm for Coherently Modulated OFDM Systems in Wireless Communication," The 13th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC), Sep 2002

7. V.S. Abhayawardhana, I.J. Wassell, "Common Phase Error Correction for OFDM in Wireless Communication," Communication Systems, Networks and Digital Signal Processing (CSNDSP), Jul 2002

8. V.S. Abhayawardhana, I.J. Wassell, "Residual Frequency Offset Correction for Coherently Modulated OFDM Systems in Wireless Communication," IEEE Vehicular Technology Conference (VTC), Spring 2002, May 2002

9. V.S. Abhayawardhana, I.J. Wassell, "Frequency Scaled Time Domain Equalization for OFDM in Broadband Fixed Wireless Access Channels," IEEE Wireless Communication and Networking Conference (WCNC), Mar 2002

10. V. S. Abhayawardhana, I. J. Wassell, "Frequency Scaled Time Domain Equalization for OFDM in Wireless Communicaion," European Wireless Conference (EWC) 2002, Feb 2002