An efficient equalization method to minimize delay spread in OFDM/DMT systems

A time domain equalization technique to be used in an orthogonal frequency division multiplex (OFDM) or discrete multitone (DMT) system is proposed, which directly minimizes the delay spread of the overall channel impulse response (CIR). It is shown that this technique can provide superior performance compared to previous developments of equalizers, which are designed to maximize the impulse energy in a certain window. The performance of the proposed method is demonstrated for transmission on local loop twisted pairs. The design algorithm requires a low computational complexity and is independent of the guard interval length. Simulation and analytical results visualize the performance of the new equalizer and compare it to those of a conventional equalizer