APPARATUS AND METHOD FOR ESTIMATING NOISE IN A MOBILE COMMUNICATION SYSTEM

摘要

An apparatus and a method for estimating noise in a mobile communication system are provided to measure accurate noise components by using a preamble signal transmitted through an OFDM frame or an OFDMA(Orthogonal Frequency Division Multiplexing Access) frame used in an OFDM or OFDMA method. According to an apparatus for estimating signal strength due to noise in a receiver device(230) of a mobile communication system supporting an OFDM method, an FFT(Fast Fourier Transform) part(234) receives a preamble signal of an OFDM frame transmitted from a transmitter device(210) and transforms the preamble signal into a preamble signal in a frequency domain through FFT. A noise measurement part(236) measures signal strength in each sub carrier allocated with a null signal from the transformed preamble signal in a frequency domain, and determines signal strength due to noise by the average of signal intensities measured in each sub carrier. The preamble signal comprises a plurality of sub carrier signals, and the sub carrier allocated with the null signal is a sub carrier not transmitting a signal by the transmitter device.