Patent ID: 8121105

Claim:
A pilot signal transmission method for use in a radio communication system, to transmit pilot signal sequences which at least have either a first property that a ratio of a self-correlation value, when a phase difference is other than zero, to a self-correlation value when the phase difference is zero and is equal to or lower than a predetermined threshold, or a second property that a cross-correlation value between the sequences that are equal in sequence length is smaller than the cross-correlation value between the sequences that are different in sequence length, by using code division multiplexing as at least one user multiplexing scheme, comprising the steps of: dividing a system band as a frequency band usable in the system into a plurality of frequency blocks having plural kinds of bandwidths; generating pilot signals of said plural frequency blocks with a single carrier, using said pilot signal sequences having sequence lengths corresponding to said plural frequency blocks; and, transmitting said generated pilot signals as the pilot signals corresponding to individual users, with multicarriers, using an arbitrary number of frequency blocks among said plurality of frequency blocks.