| 摘要 |
<p>A sub-carrier transmission ON/OFF control method capable of improving the information transmission efficiency and the reception performance while maintaining the number of transmission bits in the MC-CDMA method. Moreover, a sub-carrier transmission power control method capable of improving the information transmission efficiency and the reception performance in the MC-CDMA method or the OFDM method. In the former method, i.e., in the MC-CDMA method, a sub-carrier whose reception quality is low and for which no transmission power is assigned is not transmitted (transmission OFF) and the transmission power for it is assigned for a sub-carrier for which transmission power is assigned (transmission ON) and the sub-carrier is transmitted (sub-carrier transmission ON/OFF control). In the latter method, i.e., in the MC-CDMA method or the OFDM method, according to the reception level of each sub-carrier at the reception side, transmission power is increased for transmission of a sub-carrier as the reception level increases and the transmission power is decreased for transmission of a sub-carrier as the reception level decreases (sub-carrier inverse transmission power control).</p> |
