Pilot arrangement method in mobile radio communication system and transmitter/receiver adopting same

A base station device inserting a pilot symbol into predetermined frequency bands at a predetermined reference frequency interval, in a mobile communication system in which a working frequency band is divided into a plurality of predetermined bands and time division multiplexing is performed, comprising:

• an arrangement information generation unit to generate pilot arrangement information for inserting and arranging a pilot symbol into the plurality of predetermined frequency bands;
• a pilot channel generation unit to output the pilot symbol at a timing based on the pilot arrangement information that is output from the pilot arrangement information generation unit;
• a data and control channel generation unit to generate data and control channels;
• a multiplexing circuit to multiplex the pilot symbol that is output from the pilot channel generation unit, and data and control channels that are output from the data and control channel generation unit;
• and
• a transmission unit to multiplex the output of the multiplexing circuit in frequency and time and to generate a transmission output, wherein
• the arrangement information generation unit inserts the pilot symbol at a smaller frequency interval than the predetermined reference frequency interval into at least one frequency band out of the plurality of predetermined frequency bands, and wherein
• the arrangement information generation unit changes cyclically in time, the at least one frequency band in which the pilot symbol is inserted at the smaller frequency interval than the predetermined reference frequency interval.