the complexity and training time of decision - feedback equalization structures for use in broadband wireless communications are reduced . a modified dfe structure is able to pre - cancel postcursors in the received signal without requiring training of the feedback filter . in the modified dfe structure , an estimated channel impulse response is used in the feedback section . the output of the feedback section is passed to the feedforward filter to cancel the postcursors before convolving the result of the cancellation with the feedforward filter tap gains . therefore , only the feedforward filter needs to be trained . in broadband wireless channels , the modified dfe structure can potentially speed up the training process by ten to twenty times compared to conventional structures .