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US 7,804,764 B2Granted
Transmitter and receiver
AssigneesNational University Corporation Nara Institute of Science and Technology, SKY Perfect JSAT Corporation
InventorsTakao Hara, Anwar Khoirul, Kiyotake Ando
Life of this patent
Estimating the term…
Abstract
The transmitter of one embodiment of the present invention includes: a S/P section for converting original serial data to parallel data which will correspond to a plurality of subcarriers; and a second IFFT section for converting the parallel data from the frequency domain to the time domain. The transmitter includes, between the S/P section and the second IFFT section, a first IFFT section for modulating the plurality of subcarriers using elements of a matrix derived from an expression for Inverse Discrete Fourier Transform involving time domain signal levels and frequency domain signal levels. The configuration enables CI and PO-CI to be implemented on transmitters and receivers with a simple configuration.
Claims18
A transmitter, comprising:
- serial-to-parallel converter means for converting original serial data to parallel data which will correspond to a plurality of subcarriers;
- first Inverse Fast Fourier Transform means for converting the parallel data received from the serial-to-parallel converter means from the frequency domain to the time domain, wherein the parallel data is received in 2 groups of N/2, where N is the number of the plurality of subcarriers;
- and
- first modulator means, disposed between the serial-to-parallel converter means and the first Inverse Fast Fourier Transform means, for modulating the plurality of subcarriers using elements of a matrix derived from an expression for Fourier Transform involving time domain signal levels and frequency domain signal levels.
1 more element
A receiver, comprising:
- first Fast Fourier Transform means for converting original data from the time domain to the frequency domain;
- parallel-to-serial converter means for converting, to serial data, parallel data which will correspond to a plurality of subcarriers supplied from the first Fast Fourier Transform means, wherein the parallel data is received in 2 groups of N/2, where N is the number of the plurality of subcarriers;
- and
- first modulator means, disposed between the first Fast Fourier Transform means and the parallel-to-serial converter means, for modulating the plurality of subcarriers using elements of a matrix derived from an expression for Fourier Transform involving time domain signal levels and frequency domain signal levels.
1 more element
A transmitter, comprising:
- serial-to-parallel converter means for converting original serial data to parallel data which will correspond to a plurality of subcarriers;
- first Inverse Fast Fourier Transform means for converting the parallel data received from the serial-to-parallel converter means from the frequency domain to the time domain;
- and first modulator means, disposed between the serial-to-parallel converter means and the first Inverse Fast Fourier Transform means, for modulating the plurality of subcarriers using elements of a matrix derived from an expression for Fourier Transform involving time domain signal levels and frequency domain signal levels, wherein the matrix is made up of two matrices, the first modulator means includes a second modulator and a third modulator, and the transmitter further comprises a separator after the third modulator, wherein the two matrices are written
- (
- 1
- 1
- …
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- 1
- 1
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-
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- the separator is given by an expression:
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- .
401 more elements
A receiver, comprising:
- first Fast Fourier Transform means for converting original data from the time domain to the frequency domain;
- parallel-to-serial converter means for converting, to serial data, parallel data which will correspond to a plurality of subcarriers supplied from the first Fast Fourier Transform means;
- and first modulator means, disposed between the first Fast Fourier Transform means and the parallel-to-serial converter means, for modulating the plurality of subcarriers using elements of a matrix derived from an expression for Fourier Transform involving time domain signal levels and frequency domain signal levels, wherein the matrix is made up of two matrices, the first modulator means includes a second modulator and a third modulator, and the receiver further comprises a separator before the third modulator, wherein the two matrices are written
- (
- 1
- 1
- …
- 1
- 1
- 1
- ⅇ
- -
- j
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- 2
-
- π
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- N
- -
- 1
- )
- )
- )
- and
- the separator is given by an expression;
- ⅇ
- -
- j
-
- π
- N
- ·
- n
- .
423 more elements
Dependencies are inferred from the claim text.