WIRELESS COMMUNICATION METHOD, WIRELESS COMMUNICATION SYSTEM, AND WIRELESS TRANSMISSION DEVICE
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United States of America
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Issued Date -
Apr 3, 2025
app pub date -
Feb 7, 2022
filing date -
Feb 7, 2022
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Abstract
A wireless transmission device and a wireless reception device that support QAM and APSK are used. The wireless transmission device includes a power amplifier that varies transmission power. A constellation calculation unit calculates an estimated constellation {QAM} predicted to occur when a QAM-modulated signal is amplified by the power amplifier at desired transmission power on the basis of input/output characteristics of the power amplifier, and similarly calculates an estimated constellation {APSK} predicted to occur when an APSK-modulated signal is amplified at the desired transmission power. A modulation scheme selection unit compares an estimated minimum Euclidean distance on the estimated constellation {QAM} with an estimated minimum Euclidean distance on the estimated constellation {APSK}, and selects the modulation scheme having the longer distance.
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