Achievable bit rates of DMT and FMT systems in the presence of phase noise and multipath

Abstract

We examine a modulation technique related to orthogonal frequency division multiplexing (OFDM), called filtered multitone (FMT) modulation, which exhibits significantly lower spectral overlapping between adjacent subchannels than other OFDM schemes like discrete multitone (DMT). In particular, we compare FMT and DMT systems in the presence of phase noise due to the frequency down-conversion circuit, as well as multipath fading of the radio channel. As a measure of system performance we consider the achievable bit rate, which is given by the sum of the bit rates each subchannel is eligible to deliver with a certain bit error probability.