The uniform DFT filter bank has been used routinely in discrete multitone modulation (DMT) systems because of implementation efficiency. It has recently been shown that principal component filter banks (PCFB) which are known to be optimal for data compression and denoising applications, are also optimal for a number of criteria in DMT communication. In this paper we show that such filter banks are optimal even when scalar prefilters and postfilters are used around the channel. We show that the theoretically optimum scalar prefilter is the half-whitening solution, well known in data compression theory. We conclude with the observation that the PCFB continues to be optimal for the maximization of theoretical capacity as well.
|Journal||European Signal Processing Conference|
|State||Published - 31 Mar 2000|
|Event||2000 10th European Signal Processing Conference, EUSIPCO 2000 - Tampere, Finland|
Duration: 4 Sep 2000 → 8 Sep 2000