US 12,457,146 B2
Wireless communication method, wireless communication system, and wireless transmission device
Keita Kuriyama, Musashino (JP); Hayato Fukuzono, Musashino (JP); Toshifumi Miyagi, Musashino (JP); and Takeshi Onizawa, Musashino (JP)
Assigned to NTT, Inc., Tokyo (JP)
Appl. No. 18/833,070
Filed by NTT, Inc., Tokyo (JP)
PCT Filed Feb. 7, 2022, PCT No. PCT/JP2022/004605
§ 371(c)(1), (2) Date Jul. 25, 2024,
PCT Pub. No. WO2023/148954, PCT Pub. Date Aug. 10, 2023.
Prior Publication US 2025/0112814 A1, Apr. 3, 2025
Int. Cl. H04L 27/34 (2006.01); H04L 27/38 (2006.01); H04W 52/06 (2009.01)
CPC H04L 27/3483 (2013.01) [H04L 27/3809 (2013.01); H04W 52/06 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A wireless communication method using a wireless transmitter and a wireless receiver that support at least two multi-level modulation schemes,
the at least two multi-level modulation schemes including a first modulation scheme and a second modulation scheme, and
the wireless transmitter including a power amplifier that varies transmission power, the wireless communication method comprising:
calculating, by the wireless transmitter, a first estimated constellation predicted to occur when a signal modulated using the first modulation scheme is amplified by the power amplifier at desired transmission power, on the basis of input/output characteristics of the power amplifier;
calculating, by the wireless transmitter, a second estimated constellation predicted to occur when a signal modulated using the second modulation scheme is amplified by the power amplifier at the desired transmission power, on the basis of the input/output characteristics;
calculating, by the wireless transmitter, a first estimated Euclidean distance, which is a characteristic value of an inter-symbol distance in the first estimated constellation;
calculating, by the wireless transmitter, a second estimated Euclidean distance, which is a characteristic value of an inter-symbol distance in the second estimated constellation;
selecting, by the wireless transmitter, a modulation scheme that generates a longer one of the first estimated Euclidean distance and the second estimated Euclidean distance as a scheme used for communication;
commanding, by the wireless transmitter, the wireless reception device receiver to perform communication using the selected modulation scheme; and
communicating, by the wireless receiver, with the wireless transmitter using the commanded modulation scheme.