ISI-free FIR filterbank transceivers for frequency-selective channels

Discrete multitone modulation transceivers (DMTs) have been shown to be ver y useful for data transmission over frequency selective channels. The DMT s cheme is realized by a transceiver that divides the channel into subbands. The efficiency of the scheme depends on the frequency selectivity of the tr ansmitting and receiving filters. The receiving filters with good stopband attenuation are also desired for combating narrowband noise. The filterbank transceiver or discrete wavelet multitone (DWMT) system has been proposed as an implementation of the DMT transceiver that has better frequency band separation, but usually, inrtersymbol interference (IST) cannot be complete ly canceled in these filterbank transceivers, and additional equalization i s required. In this paper, we show how to use over interpolated filterbanks to design IST-free FIR transceivers. A finite impulse response (FIR) trans ceiver with good frequency selectivity can be designed, as will be demonstr ated by design examples.