US 12,143,207 B2
Technique to maintain formation of a parallel transmission line in spatial multiplex transmission
Marina Nakano, Musashino (JP); Yosuke Fujino, Musashino (JP); Hiroyuki Fukumoto, Musashino (JP); and Kazunori Akabane, Musashino (JP)
Assigned to NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
Appl. No. 17/762,651
Filed by NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
PCT Filed Sep. 27, 2019, PCT No. PCT/JP2019/038201
§ 371(c)(1), (2) Date Mar. 22, 2022,
PCT Pub. No. WO2021/059498, PCT Pub. Date Apr. 1, 2021.
Prior Publication US 2022/0353009 A1, Nov. 3, 2022
Int. Cl. H04L 1/00 (2006.01); H04B 7/0413 (2017.01)
CPC H04L 1/0003 (2013.01) [H04B 7/0413 (2013.01); H04L 1/0071 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A radio communication system, comprising a radio transmission apparatus including a plurality of transmission antennas and a radio reception apparatus including a plurality of reception antennas,
wherein the radio transmission apparatus includes:
a communication distance measurer configured to measure a distance between the plurality of transmission antennas and the plurality of reception antennas;
a selector configured to select a modulation scheme common to all of a plurality of frequency channels, the modulation scheme satisfying an average value of index values indicating an orthogonality between the plurality of transmission antennas and the plurality of reception antennas for each of the plurality of frequency channels according to the distance between the plurality of transmission antennas and the plurality of reception antennas measured by the communication distance measurer, and satisfying a predetermined desired bit error rate;
a transmission signal generator configured to separate transmission data into a number of all the plurality of frequency channels, modulate each item of the separated transmission data by the selected common modulation scheme, and output a plurality of transmission signals multiplexed by the number of multiplexing indicating the number of the plurality of transmission antennas to be used; and
a radio signal transmitter configured to transmit each of the plurality of transmission signals, and
the radio reception apparatus further includes a demodulator configured to demodulate a reception signal received by each of the plurality of reception antennas by a demodulation scheme corresponding to the modulation scheme to generate reception data,
wherein each of the communication distance measurer, the selector, the transmission signal generator, the radio signal transmitter and the demodulator is implemented by: )
computer executable instructions executed by at least one processor,
ii) at least one circuity or
iii) a combination of computer executable instructions executed by at least one processor and at least one circuity.