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 receive 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 receiving circuit configured for receiving the OFDM signals from a second communication apparatus by using a plurality of subcarriers allocated among an even number of contiguous frequency sub-channels, wherein the even number comprises at least an even number smaller than a number of the plurality of frequency sub-channels on the frequency band; a processing circuit configured for:
de-modulating data from each of the OFDM symbols of the first period in which data is not allocated to a first subset of subcarriers of the plurality of subcarriers positioned in respective centers of frequency sub-channels among the even number of the contiguous frequency sub-channels, andde-modulating data from each of the OFDM symbols of the second period in which data is not allocated to a second subset of subcarriers of the plurality of subcarriers 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, in which data is allocated to the second subset of subcarriers positioned in respective centers of frequency sub-channels among the even number of the contiguous frequency sub-channels.