Apparatus and method for estimating direction of arrival signal in communication system

PURPOSE: An apparatus and a method for estimating the signal arrival direction in a communication system are provided to estimate the arrival direction of a signal using a signal obtained through filtering of a noise region. CONSTITUTION: A signal arrival direction estimating apparatus(100) comprises a signal receiver(110), a preprocessor(120), a signal rearrangement processor(130), and a signal arrival direction estimator(140). The preprocessor converts a signal received through the signal receiver into a frequency region and denoises the converted time sample. The signal rearrangement processor measures an occupied bandwidth through spectrum analysis of the denoised signal and filters a noise region from the denoised signal based on the occupied bandwidth. The signal arrival direction estimator estimates a signal arrival direction using the filtered signal.