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US 10,476,720 B2Granted
Method of signal generation and signal generating device
AssigneeSun Patent Trust
InventorsYutaka Murakami, Tomohiro Kimura, Mikihiro Ouchi
Life of this patent
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Abstract
A transmission method simultaneously transmitting a first modulated signal and a second modulated signal at a common frequency performs precoding on both signals using a fixed precoding matrix and regularly changes the phase of at least one of the signals, thereby improving received data signal quality for a reception device.
Claims4
A signal generation method comprising:
- phase-changing all of a plurality of baseband signals using each of a plurality of phase changing patterns, each of the plurality of phase changing patterns being different from each other;
- inverse-fast-Fourier-transforming each of the plurality of baseband signals to which the phase change is applied, to each of a plurality of orthogonal frequency-division multiplexing (OFDM) transmission signals;
- and
- applying Gard Interval insertion processing to each of the plurality of OFDM transmission signals for transmission on a same frequency band and at a same time, wherein
- the phase of each of the plurality of baseband signals is regularly changed according to each of the plurality of phase changing patterns for each subcarrier of the plurality of OFDM transmission signals,
- each of the plurality of phase changing patterns having N phase change value candidates,
- N being an integer greater than two, and
- each candidate of the N phase change value candidates being selected at least once within a determined period.
5 more elements
A signal generation apparatus comprising:
- phase change circuitry phase-changing all of a plurality of baseband signals using each of a plurality of phase changing patterns, each of the plurality of phase changing patterns being different from each other;
- inverse fast Fourier transform circuitry inverse-fast-Fourier-transforming each of the plurality of baseband signals to which the phase change is applied, to each of a plurality of orthogonal frequency-division multiplexing (OFDM) transmission signals;
- and
- Gard Interval insertion circuitry applying Gard Interval insertion processing to each of the plurality of OFDM transmission signals for transmission on a same frequency band and at a same time, wherein
- the phase of each of the plurality of baseband signals is regularly changed according to each of the plurality of phase changing patterns for each subcarrier of the plurality of OFDM transmission signals,
- each of the plurality of phase changing patterns having N phase change value candidates,
- N being an integer greater than two, and
- each candidate of the N phase change value candidates being selected at least once within a determined period.
5 more elements
A signal demodulation method for demodulating a reception signal obtained by receiving a plurality of orthogonal frequency-division multiplexing (OFDM) transmission signals, the signal demodulation method comprising:
- obtaining the plurality of OFDM transmission signals, wherein
- the plurality of OFDM transmission signals are generated by phase-changing all of a plurality of baseband signals using each of a plurality of phase changing patterns, inverse-fast-Fourier-transforming each of the plurality of baseband signals to which the phase change is applied, to each of the plurality of OFDM transmission signals;
- applying Gard Interval insertion processing to each of the plurality of OFDM transmission signals for transmission on a same frequency band and at a same time, each of the plurality of phase changing patterns being different from each other, wherein
- the phase of each of the plurality of baseband signals is regularly changed according to each of the plurality of phase changing patterns for each subcarrier of the plurality of OFDM transmission signals, each of the plurality of phase changing patterns having N phase change value candidates, N being an integer greater than two, and each candidate of the N phase change value candidates being selected at least once within a determined period;
- and
- demodulating the reception signal from the plurality of OFDM transmission signals.
3 more elements
A signal demodulation apparatus for demodulating a reception signal obtained by receiving a plurality of orthogonal frequency-division multiplexing (OFDM) transmission signals, the signal demodulation apparatus comprising:
- reception circuitry obtaining the plurality of OFDM transmission signals, wherein
- the plurality of OFDM transmission signals are generated by phase-changing all of a plurality of baseband signals using each of a plurality of phase changing patterns, inverse-fast-Fourier-transforming each of the plurality of baseband signals to which the phase change is applied, to each of the plurality of OFDM transmission signals, and applying Gard Interval insertion processing to each of the plurality of OFDM transmission signals for transmission on a same frequency band and at a same time, each of the plurality of phase changing patterns being different from each other, and
- the phase of each of the plurality of baseband signals is regularly changed according to each of the plurality of phase changing patterns for each subcarrier of the plurality of OFDM transmission signals, each of the plurality of phase changing patterns having N phase change value candidates, N being an integer greater than two, and
- each candidate of the N phase change value candidates being selected at least once within a determined period;
- and
- demodulate circuitry demodulating the reception signal from the plurality of OFDM transmission signals.
3 more elements
Dependencies are inferred from the claim text.