Transmitter, receiver, transmission method, and reception method
AssigneePanasonic Intellectual Property Corporation of America
InventorPeter Klenner
Life of this patent
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Abstract
A transmitter includes: a modulation circuit that modulates a data sequence using QAM by mapping the data sequence to only four symbols each of which differs in phase by 90 degrees from an adjacent one of the four symbols and at least two of which have different amplitudes; and a transmission circuit that wirelessly transmits the data sequence mapped to the four symbols through the modulation by the modulation circuit, by assigning the data sequence mapped to the four symbols through the modulation by the modulation circuit to different subcarriers for Orthogonal Frequency Division Multiplexing (OFDM).
Claims6
A transmission method comprising:
- mapping, with circuitry, a data sequence to only four symbols according to asymmetric Quadrature Amplitude Modulation (QAM), each of the four symbols having a phase that is different from a phase of an adjacent one of the four symbols by 90 degrees, at least two of the four symbols having different amplitudes;
- and
- generating, with circuitry, an Orthogonal Frequency Division Multiplexing (OFDM) signal based on the data sequence mapped;
- and
- wirelessly transmitting, with a transmitter, the OFDM signal.
A reception method, comprising:
- wirelessly-receiving, with a receiver, an Orthogonal Frequency Division Multiplexing (OFDM) signal generated based on a mapped data sequence, the mapped data sequence being generated by mapping a data sequence to only four symbols according to asymmetric Quadrature Amplitude Modulation (QAM), each of the four symbols having a phase that is different from a phase of an adjacent one of the four symbols by 90 degrees, at least two of the four symbols having different amplitudes;
- and
- demodulating, with a demodulation circuit, the OFDM signal according to the asymmetric QAM to generate the data sequence.
Dependencies are inferred from the claim text.