Patent ID: 7751304

Claim:
A base station for use in a wideband wireless communication system where an FC (frame cell) covers a total frequency band and a time interval and the FC includes a plurality of TFCs (time-frequency cells) each of which has at least one OFDM (Orthogonal Frequency Division Multiplexing) symbol interval and at least one sub-carrier, the base station comprising: a pilot code pattern generator for initializing to zero a variable N representing an FC number, and generating an Nth spreading code for an Nth FC among spreading codes according to an IDentifier (ID) of the base station, the spreading codes being included in a code set; a first spreader for spreading a pilot symbol mapped onto an Nth FC with the Nth spreading code, and controlling a gain so as to transmit the pilot symbol at a higher signal level than data; a second spreader for spreading data symbols mapped onto the Nth FC with spreading codes from the code set except for the Nth spreading code; a mapper for mapping a spread signal from the first spreader and spread signals from the second spreader on a TFC basis, and outputting signals that constitute each TFC to points of sub-carriers; and an IFFT (Inverse Fast Fourier Transform) unit for an IFFT processing output signals from the mapper, wherein the pilot code pattern generator increases the variable N by 1 if the Nth FC signal is generated, determines if the variable N is greater than a number of the spreading codes included in the code set, and generates the Nth spreading code among the spreading codes of the code set if the variable N is less than the length of the code set.