Patent ID: 7599428

Claim:
A frequency-division multiplexing transmission apparatus for transmitting data in a frequency spectrum specific to a mobile station, comprising: a first phase-rotation unit that performs phase rotation that increases in increments of π/4 or decreases in decrements of −π/4 for each symbol of a transmission-symbol sequence; a symbol-repetition and rearrangement unit that compresses the time domains of each symbol of the transmission-symbol sequence after phase rotation, then repeats those symbols a specified number of times (L times), and rearranges the symbols of the obtained repetitive-symbol sequence so that the obtained respective-symbol sequence has the same arrangement as the transmission-symbol sequence; a second phase-rotation unit that performs phase rotation that changes at a speed specific to the mobile station for each symbol of the rearranged repetitive-symbol sequence; and a transmission unit that transmits said phase-rotated symbols.