Patent ID: 7161895

Claim:
An OFDM-CDMA transmission apparatus comprising: a first spreader that carries out spreading processing on a plurality of transmission signals at a predetermined spreading factor using different spreading codes respectively; a second spreader that carries out spreading processing on a known signal at the same spreading factor as the first spreader using a spreading code that is different from said spreading codes; a frequency division multiplexer that breaks down the known signal after the spreading processing by the second spreader into individual chips and subjects the known signal chips to frequency division multiplexing by assigning said known signal chips to subcarriers aligned in a frequency axis direction, the number of said subcarriers matching said spreading factor, and subjects the transmission signals after the spreading processing by the first spreader to frequency division multiplexing by assigning said transmission signals to said subcarriers; and a transmitter that transmits the known signal chips simultaneously and transmits said known signal chips and the transmission signals assigned to the subcarriers by the frequency division multiplexer simultaneously.