Patent ID: 7630454

Claim:
A frequency-division multiplexing transmission apparatus for transmitting data in a frequency spectrum specific to a mobile station, comprising: a chip-dividing unit that divides each symbol of a transmission-symbol sequence into chips; a first phase rotation unit that performs .pi./2 or −.pi./2 phase rotation for the even-numbered or odd-numbered chips of said divided chips; a chip-repetition and rearrangement unit that compresses the time domains of each chip of the chip sequence after phase rotation, then repeats the chips a specified number of times and rearranges the chips of the obtained repetitive-chip sequences so that they have the same arrangement as the original chip sequence; a second phase rotation unit that performs phase rotation that changes at a speed specific to a mobile station for each chip of the rearranged repetitive-chip sequence; and a transmission unit that transmits said phase-rotated chips.