COMMUNICATION METHOD AND RADIO TRANSMITTER

摘要

Radio transmission is performed even to a communication party whose bandwidth that can be used for transmission and reception is limited without having an influence of an offset of a DC component. A radio transmitter applied to an OFDMA communication system in which a plurality of different terminals performs communication using OFDM signals at the same time that includes a mapping part that allocates transmission power to each subcarrier, and also selects a subcarrier to which minimum power of the transmission power to be allocated is allocated and modulates transmission data in units of communication slots to output the modulated data; and a transmission part for transmitting radio signals including the modulated data using each of the subcarriers.

主权项

1. A first communication apparatus configured to transmit OFDM signals by using at least some of a plurality of frequency sub-channels on a frequency band without a center subcarrier positioned in a center frequency of the frequency band, each of the OFDM signals comprising OFDM symbols for a first period and OFDM symbols for a second period, the first communication apparatus comprising:
a transmitting circuit configured for transmitting the OFDM signals to a second communication apparatus by using a plurality of subcarriers allocated among an even number of contiguous frequency sub-channels that can be used simultaneously by the second communication apparatus, wherein the even number comprises at least an even number smaller than the number of frequency sub-channels; a processing circuit configured for:
allocating data for constructing each of the OFDM symbols for the first period to a first subset of subcarriers of the plurality of subcarriers without allocating data to each of respective subcarriers positioned in respective centers of frequency sub-channels among the even number of the contiguous frequency sub-channels, andallocating data for constructing each of the OFDM symbols for the second period to a second subset of subcarriers of the plurality of subcarriers without allocating data to a subcarrier positioned in a center of a frequency band of the even number of the contiguous frequency sub-channels for the second period, the unused subcarrier being in a center between contiguous frequency sub-channels, the second subset of subcarriers comprising the respective subcarriers positioned in respective centers of frequency sub-channels among the even number of the contiguous frequency sub-channels.