Patent ID: 7436758

Claim:
A method for mapping a pilot signal to a time-frequency cell in an OFDMA (Orthogonal Frequency Division Multiple Access) wireless communication system, in which the time-frequency cell includes at least one OFDM symbol and at least one sub-carrier within a signal frame cell (FC), a total frequency bandwidth of the OFDMA system is divided into at least one sub-bandwidth including a plurality of sub-carriers, and the FC includes one sub-bandwidth of the at least one sub-bandwidth and at least one OFDM symbol interval, the method comprising the steps of: a) spreading a pilot signal using a first orthogonal code and a data signal using a second orthogonal code different from the first orthogonal code; b) combining the spread pilot signal and the spread data signal; and c) mapping the combined signal to a predetermined time-frequency cell in the FC.