  A rateless transmission architecture is developed for communication over
Gaussian intersymbol interference channels, based on the concept of
super-Nyquist (SNQ) signaling. In such systems, the signaling rate is chosen
significantly higher than the Nyquist rate of the system. We show that such
signaling, when used in conjunction with good "off-the-shelf" base codes,
simple linear redundancy, and minimum mean-square error decision feedback
equalization, results in capacity-approaching, low-complexity rateless codes
for the time-varying intersymbol-interference channel. Constructions for both
single-input / single-output (SISO) and multi-input / multi-output (MIMO) ISI
channels are developed.
