Communication method and radio transmitter
DCFirst Claim
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 a number of the plurality of frequency sub-channels on the frequency band;
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.
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Accused Products
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.
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Citations
14 Claims
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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:
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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 a number of the plurality of frequency sub-channels on the frequency band; 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, and allocating 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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for transmitting OFDM signals by a first communication apparatus 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 method comprising:
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transmitting the OFDM signals from the first communication apparatus 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 a number of the plurality of frequency sub-channels on the frequency band; 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; allocating 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. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification