Patent ID: 7218617

Claim:
A transmission method in a base station for use in a CDMA mobile communication system for transmitting a signal of each of a plurality of channels included in each of a plurality of channel groups, the transmission method comprising the steps of: spreading the signal of each of the plurality of channels included in each of the plurality of channel groups, by using an orthogonal code, and summing up to combine the signals spread by using the orthogonal code for each of the plurality of channel groups, so that sets of the signals spread by using the orthogonal code are generated, each of the sets corresponding to each of the plurality of channel groups; spreading each of the sets of the signals spread by using the orthogonal code, by using a spreading code; summing up to combine each of the sets of the signals spread by using the orthogonal code and the spreading code; and transmitting the sets of the signals which are summed up to combine, wherein the spreading codes differ from each other, the orthogonal codes differ from each other, channels of each channel group include a pilot channel, the pilot channel is spread by using the orthogonal code and the spreading code, and a signal transmitted over the pilot channel undergoes data modulation by a known pattern or does not undergo any data modulation.