Patent ID: 8432978

Claim:
A method for arranging tones in a tone sequence in a high rate packet data system for a broadcast service, the method comprising the steps of: receiving packet data from a higher layer and modulating the received packet data; inserting guard tones into the modulated packet data; inserting pilot tones into the modulated packet data based on a pilot tone offset, the pilot tone offset being an offset of a position in the tone sequence in the modulated packet data, where one of the pilot tones is inserted in the tone sequence according to a pilot tone arrangement, from a reference position in the tone sequence; and transmitting packet data into which the pilot tones have been inserted, wherein the pilot tone offset is differently applied according to broadcast service content in the same slot, and wherein the step of inserting the pilot tones comprises applying the pilot tone offset, wherein the pilot tones are not placed in a direct current (DC) frequency, and wherein the pilot tones are placed at an equal interval.