US 2013/0272248 A1 · COMMUNICATION METHOD AND RADIO TRANSMITTER

Abstract

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.

Claims6

Dependent claims

A transmission apparatus configured to communicate OFDM signals with a terminal using a plurality of contiguous frequency channels composed of a plurality of subcarriers, the transmission apparatus comprising:

a transmitting section configured to transmit the OFDM signals using a number of frequency channels that is less than or equal to a number of frequency channels that the terminal is configured to receive;
and
a mapping part configured to allocate data to the plurality of subcarriers, wherein the mapping part is configured to respond to an increase in the number of frequency channels used in the communication by increasing a ratio between a number of subcarriers to which the data is allocated and a number of subcarriers to which the data can be allocated in the plurality of contiguous frequency channels, wherein the data is not allocated to at least one subcarrier in a center of a frequency band occupied by the plurality of contiguous frequency channels.

Dependencies are inferred from the claim text.

Communication method and radio transmitter

Life of this patent

Communication method and radio transmitter

Life of this patent

Abstract

Claims6