1. A method of denoising in channel estimation, the method comprising: calculating a noise power value and a second power value of each path in each user window based on a channel estimation result, wherein the user window comprises a channel impulse response window corresponding to the user; calculating a denoising threshold factor using the noise power value and the second power value of each path in each user window; calculating a denoising threshold value using the noise power value and the denoising threshold factor; and performing denoising processing on the channel estimation result using the denoising threshold value.