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US 11,240,084 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.
Claims3
A signal generation method comprising:
- generating baseband signals by defined error correcting coding;
- phase-changing the baseband signals with respective phase changing patterns to generate respective phase-changed signals, each of the phase changing patterns being different from each other;
- and
- inverse-fast-Fourier-transforming the phase-changed signals to respective orthogonal frequency division multiplexing (OFDM) transmission signals, wherein
- each phase changing pattern has N candidates for an amount of change in a phase, N being an integer greater than two, and
- each candidate is periodically selected from the N candidates based on subcarriers of the respective OFDM transmission signals, a phase of a corresponding baseband signal among the baseband signals being changed by the each candidate.
3 more elements
A signal generation apparatus comprising:
- a coding circuit configured to generate baseband signals by defined error correcting coding;
- a phase change circuit configured to phase-change the baseband signals with respective phase changing patterns to generate respective phase-changed signals, each of the phase changing patterns being different from each other;
- and
- an inverse fast Fourier transform circuit configured to inverse-fast-Fourier-transform the phase-changed signals to respective orthogonal frequency division multiplexing (OFDM) transmission signals, wherein
- each phase changing pattern has N candidates for an amount of change in a phase, N being an integer greater than two, and
- each candidate is periodically selected from the N candidates based on subcarriers of the respective OFDM transmission signals, a phase of a corresponding baseband signal among the baseband signals being changed by the each candidate.
3 more elements
A signal processing apparatus comprising:
- a fast Fourier transform circuit configured to fast-Fourier-transform received signals, the signals having been generated by a signal generation method and transmitted,
- the signal generation method comprising:
- generating baseband signals by defined error correcting coding;
- phase-changing the baseband signals with respective phase changing patterns to generate respective phase-changed signals, each of the phase changing patterns being different from each other;
- and
- inverse-fast-Fourier-transforming the phase-changed signals to respective orthogonal frequency division multiplexing (OFDM) transmission signals, wherein
- each phase changing pattern has N candidates for an amount of change in a phase, N being an integer greater than two, and
- each candidate is periodically selected from the N candidates based on subcarriers of the respective OFDM transmission signals, a phase of a corresponding baseband signal among the baseband signals being changed by the each candidate;
- and
- a demodulating circuit configured to demodulate the signal after the fast Fourier transform based on the phase changing patterns and the error correction coding.
7 more elements
Dependencies are inferred from the claim text.