E&CSE Research Seminar, Wednesday 02 - 05 - 2007

Abstract:

Orthogonal Frequency Division Multiplexing (OFDM) is a kind of multicarrier modulation technique which is used extensively in wired and wireless radio systems. Two important new developments in the field of OFDM research are the combination of OFDM with systems using multiple antennas: which are usually called multiple input multiple output (MIMO) systems, and the application of OFDM to optical systems. The proposed research will contribute to both of these emerging fields. The work on optical OFDM will focus on the theoretical analysis of the channel capacity of optical OFDM system and on new channel estimation techniques for optical OFDM. The MIMO OFDM work will investigate the combination of polynomial cancellation coded (PCC) OFDM with MIMO techniques. PCC-OFDM is a form of OFDM which has very much reduced sensitivity to frequency offset and Doppler Shift than conventional OFDM.  This research will investigate techniques of using PCC-OFDM in MIMO systems to give systems which have low sensitivity to frequency offset, are robust and have low computational complexity.