Patent ID: 8189695

Claim:
A transmission method in an Orthogonal Frequency Division Multiplex and Code Division Multiple Access (OFDM-CDMA) communication system that generates a plurality N of subcarrier components for each transmission symbol by spreading each of M number of transmission symbols with spreading code having a spreading factor N, and transmits those subcarrier components for each transmission symbol by a plurality of different subcarriers from a transmitter, comprising: measuring a propagation environment of each of M×N number of subcarriers; dividing all of the subcarriers into first to Mth groups of N number of subcarriers, wherein the subcarriers are grouped according to whose propagation environments are close to one another based on the measurement results; using the N number of subcarriers of a predetermined group for transmitting said plurality N number of subcarrier components for each symbol; creating a control signal for notifying a receiving side of a relationship between the subcarrier components and subcarriers; generating a group determination control signal specifying the subcarrier group determination based on a size of the spreading factor N; and wherein N and M are integers.