US 12,445,153 B2
Wireless communication system, transmission method and reception method
Kei Ito, Tokyo (JP); and Tatsuhiro Nakada, Tokyo (JP)
Assigned to KOKUSAI DENKI Electric Inc., Tokyo (JP)
Appl. No. 18/041,290
Filed by HITACHI KOKUSAI ELECTRIC INC., Tokyo (JP)
PCT Filed Sep. 10, 2020, PCT No. PCT/JP2020/034312
§ 371(c)(1), (2) Date Feb. 10, 2023,
PCT Pub. No. WO2022/054203, PCT Pub. Date Mar. 17, 2022.
Prior Publication US 2023/0238989 A1, Jul. 27, 2023
Int. Cl. H04L 7/10 (2006.01); H04B 1/04 (2006.01); H04B 1/16 (2006.01); H04L 5/00 (2006.01)
CPC H04B 1/04 (2013.01) [H04B 1/16 (2013.01); H04L 5/0048 (2013.01); H04L 7/10 (2013.01); H04B 2001/0408 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A wireless communication system, in which a transmitter and a receiver perform wireless communication using a frame capable of selecting whether or not a preamble signal block for storing a preamble signal used for gain control is included therein,
wherein the transmitter comprises:
an automatic transmission gain controller configured to multiply a transmission signal by a gain value which is equivalent to a difference between a power of a signal looped back from a power amplifier of the transmitter and a power of a transmission signal,
a fixed transmission gain multiplier configured to multiply the transmission signal by a predetermined gain value or a gain value used by the automatic transmission gain controller for a previous frame, and
a transmission signal selector configured to select a transmission signal whose gain has been controlled by the automatic transmission gain controller when a frame of the transmission signal include a preamble signal block, and to select a transmission signal whose gain has been controlled by the fixed transmission gain multiplier when the frame of the transmission signal includes no preamble signal block, and
wherein the receiver comprises:
an automatic gain controller configured to multiply a reception signal by a gain value which is equivalent to a difference between a power of the reception signal and a target power,
a fixed gain multiplier configured to multiply the reception signal by a predetermined gain or a gain value used by the automatic gain controller for the previous frame, and
a reception signal selector configured to select a reception signal whose gain has been controlled by the automatic gain controller when a frame of the reception signal includes a preamble signal block, and to select a reception signal whose gain has been controlled by the fixed gain multiplier when the frame of the reception signal includes no preamble signal block.