My main research interests are in VLSI architectures for digital communication systems and digital signal processing. Table of Contents Research Chips Journals and Magazines Courses Research Several wireless and wireline communication schemes use a modulation technique known as multicarrier modulation.
Modulation is the process of shaping a signal to fit a given communications channel.
In multicarrier modulation, rather than using a single carrier, like traditional AM radio modulation, multiple, orthogonal carriers are used to carry data over a communications channel. The main strength of DMT modulation in twisted-pair copper systems is that it enables shaping of the frequency spectrum to avoid noisy spots in the channel frequency spectrum. An advantage of multicarrier modulation in wireless systems is that it helps to mitigate the problem of multipath fading. In wireless systems, the radiated signals tend to bounce off objects surrounding the destination antenna and thus a given signal will take multiple paths to an antenna. These multiple paths or echoes get mixed together at the receiver and garble the signal.