Estimation method for communication channel in uwb receiver and uwb receiver for estimating communication channel

A method for estimating a communications channel in a UWB receiver according to one embodiment of the present invention comprises: (a) a step of performing a first correlation operation between a PN signal which is received in the UWB receiver and a local PN signal; (b) a step of performing a second correlation operation for a correlation function obtained from the first correlation operation using two sequential correlation windows; (c) a step of detecting whether a peak exists in correlation values obtained from the second correlation operation; (d) a step of repeating the (b) and (c) steps after increasing the sizes of the correlation windows for the second correlation operation if the peak is not detected; and (e) a step of estimating a kind of the communications channel by comparing the sizes of the correlation windows and cluster inter-arrival times if the peak is detected.