A transmitted symbol matrix and a received symbol vector are transformed based on a non-identity transformation. The non-identity transformation is based on a finite spread of a channel impulse response in a time domain and is usable to improve accuracy of channel estimation in a frequency domain. A transformed channel vector is determined based on the transformed transmitted symbol matrix and the transformed received symbol vector using a channel estimation method. One or more elements in the transformed channel vector are suppressed to at or about zero. The suppressed, transformed channel vector is inverse transformed into an estimated channel vector based on the non-identity transformation.