Patent ID: 8068531

Claim:
A method for eliminating narrow-band interference by way of windowing in a spread spectrum system, comprising the following steps of: (a) extracting N sampling points of data to perform frequency spectrum transform, in order to obtain N points of data after frequency spectrum transform each time, wherein N is the number of the points and is an positive integer; then performing control information update and interference elimination processing respectively, wherein the control information update comprises the following steps of: (b) for the N sampling points within a set time period, getting an energy accumulation of individual data after transform for M times and obtaining N energy values, comparing the N energy values with a threshold that is computed from the energy values, and then determining the number of narrow-band interferences as well as width and location of each narrow-band interference, M≧1; (c) determining width, location and shape of corresponding frequency domain adjusting window and determining points included in the window and adjusted values of the points based on the width and location of each narrow-band interference; the interference elimination processing comprises the following steps of: (b′) for the N points of data after frequency spectrum transform each time, based on the information of obtained points included in each window and adjusted value of each point during the current time period and the last period, setting energy values of the data at these points as the corresponding adjusted values and finally performing frequency spectrum inverse transform for those adjusted values, then outputting them; wherein in step (c), the window shape is determined as follows: with prescient energy concentration degree of narrow-band interference signals, if interference energy is concentrated, then a window with a steep edge is selected; if the interference energy is scattered, then a window with a slow-changing edge is selected.