WIRELESS COMMUNICATION METHOD, WIRELESS COMMUNICATION SYSTEM, AND WIRELESS TRANSMISSION DEVICE
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United States of America
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Apr 10, 2025
app pub date -
Feb 7, 2022
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Feb 7, 2022
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Abstract
A wireless transmission device and a wireless receiver that support at least two multi-level modulation schemes are used. The multi-level modulation scheme includes a first modulation scheme (QAM) and a second modulation scheme (APSK) having a shorter minimum Euclidean distance on the constellation and a lower PAPR than the first modulation scheme. A power amplifier has a function of changing transmission power. A transmission power control unit determines transmission power, and the power amplifier changes the transmission power. A modulation scheme selection unit compares the transmission power with a threshold value set on the basis of a boundary point at which a linear region and a nonlinear region of the power amplifier are switched, selects the QAM when the transmission power is not greater than the threshold value, and selects the APSK when the transmission power is greater than the threshold value.
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