Radio communication device and signal division method
First Claim
1. A communication apparatus comprising:
- a transforming section configured to transform a symbol in a time domain into a signal in a frequency domain with a discrete Fourier transform (DFT) having a size that is a product of powers of a plurality of values;
a mapper configured to map the signal in the frequency domain on a plurality of frequency bands, each frequency band including a plurality of subcarriers, each frequency band being located at a position separate from position(s) of other of the plurality of frequency bands, and a size of at least one of the plurality of frequency bands being a multiple of a product of two or more powers of prime numbers; and
a generator configured to generate a single carrier-frequency division multiple access (SC-FDMA) signal in the time domain from the mapped signal.
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Accused Products
Abstract
Provided is a radio communication device which can reduce ISI caused by destruction of an orthogonal DFT matrix even when an SC-FDMA signal is divided into a plurality of clusters and the clusters are respectively mapped to discontinuous frequency bands. The radio communication device includes a DFT unit (110), a division unit (111), and a mapping unit (112). The DFT unit (110) uses the DFT matrix to execute a DFT process on a symbol sequence in a time region to generate a signal (SC-FDMA signal) of the frequency region. The division unit (111) generates a plurality of clusters by dividing the SC-FDMA signal with a partially orthogonal bandwidth corresponding to the vector length of some of the column vectors constituting the DFT matrix used in the DFT unit (110) and orthogonally intersecting at least partially. The mapping unit (112) maps the clusters to discontinuous frequency bands.
14 Citations
8 Claims
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1. A communication apparatus comprising:
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a transforming section configured to transform a symbol in a time domain into a signal in a frequency domain with a discrete Fourier transform (DFT) having a size that is a product of powers of a plurality of values; a mapper configured to map the signal in the frequency domain on a plurality of frequency bands, each frequency band including a plurality of subcarriers, each frequency band being located at a position separate from position(s) of other of the plurality of frequency bands, and a size of at least one of the plurality of frequency bands being a multiple of a product of two or more powers of prime numbers; and a generator configured to generate a single carrier-frequency division multiple access (SC-FDMA) signal in the time domain from the mapped signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A communication method performed by a communication apparatus, comprising:
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transforming a symbol in a time domain into a signal in a frequency domain with a discrete Fourier transform (DFT) having a size that is a product of powers of a plurality of values; mapping the signal in the frequency domain on a plurality of frequency bands, each frequency band including a plurality of subcarriers, each frequency band being located at a position separate from position(s) of other of the plurality of frequency bands, and a size of at least one of the plurality of frequency bands being a multiple of a product of two or more powers of prime numbers, a size of at least one of the plurality of frequency bands being a multiple of a product of two or more powers of prime numbers; and generating a single carrier-frequency division multiple access (SC-FDMA) signal in the time domain from the mapped signal.
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Specification