Patent ID: 7526035

Claim:
A communication method for a mobile station in a broadband wireless communication system in which a total frequency band of sub-carriers is divided into a plurality of sub-bands and frame cells (FCs) are defined, each FC being defined by one sub-band and a predetermined time period, and having at least one time-frequency cell (TFC) defined by one orthogonal frequency division multiplexing (OFDM) symbol and a predetermined number of subcarriers, the method comprising the steps of: OFDM-demodulating a received signal by fast Fourier transform (FFT)-processing the received signal and separating the OFDM-demodulated data according to the sub-bands; extracting pilot data from the separated OFDM-demodulated data; generating channel estimates of each of the sub-bands for the predetermined time period using the extracted pilot data; calculating a channel mean (A) and a channel secondary statistical value (B) of each of the sub-bands using channel estimates for a predetermined time among the generated channel estimates; calculating a channel secondary statistical value (C) of at least one of the sub-bands using channel estimates for a predetermined frequency among the generated channel estimates; and transmitting, to a base station, channel measurement information including the calculated one or more mean value(s) (A), the calculated one or more secondary statistical value(s) (B), and the calculated one or more secondary statistical value(s) (C); detecting data of allocated TFCs from the OFDM-demodulated data; generating a symbol sequence by despreading the detected data with a predetermined spreading code; and recovering data by demodulating and decoding the symbol sequence; wherein the one or more mean value(s) (A) represents an average frequency-domain channel states, the one or more secondary statistical value(s) (B) represents a channel variation in frequency-domain, and the one or more secondary statistical value(s) (C) represents a channel variation in time-domain.