Time-domain channel equalizer design using the inverse power method

The discrete multitone (DMT) modulation is the transmission scheme of choice in ADSL. DMT works on the condition that the standardized length-32 cyclic prefix guard band is longer than the channel for the purpose of orthogonalizing the sub-bands. Time-domain equalizers (TEQ) have been designed for the DMT receiver to shorten the physical channel response. This paper expands on a proposed TEQ scheme by reformulating its optimization problem to avoid matrix decompositions or inversions, and by devising a numerically sound solution using the inverse power method. Simulation results show the reformulated solution to be near-optimal.