OFDM TRANSMITTER AND OFDM TRANSMITTING METHOD

摘要

When an OFDM-CDMA signal is formed, the CDMA processing section 130 spreads transmission data U1(k) using even symmetric codes and odd symmetric codes as spreading codes and the OFDM processing section 140 modulates a plurality of mutually orthogonal subcarriers by adapting even symmetric or odd symmetric chips after spreading processing so that mutually symmetric chips are assigned to subcarriers having mutually opposite phases. This causes signal points of modulated signals of the transmission data to move on different straight lines on the I-Q plane. As a result, it is possible to disperse signal points uniformly and thereby suppress the peak voltage.