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, each of the OFDM signals comprising a first period and 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 a number M of contiguous frequency channels that can be used simultaneously by the second communication apparatus, wherein the number M is an even number greater than or equal to two and does not exceed the number of frequency channels that can be simultaneously used by the first communication apparatus; and a processing circuit configured for:
allocating data for transmission during 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 the number M of the contiguous frequency channels,allocating data for transmission during the second period to a second subset of subcarriers of the plurality of subcarriers without allocating data to at least a subcarrier positioned in a center of a frequency band of the number M of the contiguous frequency channels for the second period, the second subset of carriers comprising the respective subcarriers positioned in respective centers of the number M of the contiguous frequency channels.