Wireless communication system, wireless communication method, transmitter, and receiver
A wireless communication method according to an embodiment includes converting n+1 signals into n predetermined power signals obtained by setting a C/N to a predetermined value and into n divided signals obtained by setting the C/N to 1/n of a predetermined value and performing division into n, superimposing the n predetermined power signals and the n divided signals that have been converted, non-orthogonally so as to be n multiplexed signals for the n frequency channels, transmitting the n multiplexed signals, receiving n multiplexed signals, demodulating n predetermined power signals from the n multiplexed signals that have been received, creating replica signals of each of the n predetermined power signals, subtracting each of the n replica signals that have been created from each of the n multiplexed signals, and combining the n subtracted signals.
1. A wireless communication system comprising a transmission device and a reception device that perform wireless communication using n (n≥2) frequency channels, wherein the transmission device includes
a conversion unit that converts n+1 signals into n predetermined power signals obtained by setting a carrier-to-noise ratio (C/N) to a predetermined value and into n divided signals obtained by setting the C/N to 1/n of the predetermined value and performing division into n,
a superimposition unit that superimposes the n predetermined power signals and the n divided signals converted by the conversion unit non-orthogonally so as to be n multiplexed signals for the n frequency channels, and
a transmission unit that simultaneously transmits the n multiplexed signals obtained by superimposing by the superimposition unit by the n frequency channels, and
the reception device includes
a reception unit that receives the n multiplexed signals transmitted by the n frequency channels,
a demodulation unit that demodulates the n predetermined power signals from the n multiplexed signals received by the reception unit,
a replica creation unit that duplicates each of the n predetermined power signals demodulated by the demodulation unit and creates n replica signals,
a subtraction unit that subtracts each of the n replica signals created by the replica creation unit from each of the n multiplexed signals received by the reception unit to calculate n subtracted signals, and
a combining unit that combines the n subtracted signals calculated by the subtraction unit.
2. The wireless communication system according to claim 1 , wherein the n frequency channels are frequency channels that are different from each other in at least one of a polarization plane and a frequency.
3. The wireless communication system according to claim 1 , wherein the reception device further includes
a transfer unit that transfers the n predetermined power signals demodulated by the demodulation unit to a first wireless communication device by the n frequency channels, and transfers the n subtracted signals combined by the combining unit to a second wireless communication device disposed in a direction different from the first wireless communication device through any of the n frequency channels.
4. A wireless communication method in which a transmission device and a reception device perform wireless communication using n (n≥2) frequency channels, the method comprising:
a conversion step of converting n+1 signals into n predetermined power signals obtained by setting a carrier-to-noise ratio (C/N) to a predetermined value and into n divided signals obtained by setting the C/N to 1/n of the predetermined value and performing division into n;
a superimposition step of superimposing the n predetermined power signals and the n divided signals that have been converted, non-orthogonally so as to be n multiplexed signals for the n frequency channels;
a transmission step of simultaneously transmitting the n multiplexed signals obtained by superimposing, by the n frequency channels;
a reception step of receiving the n multiplexed signals transmitted by the n frequency channels;
a demodulation step of demodulating the n predetermined power signals from the n multiplexed signals that have been received;
a replica creation step of duplicating each of the n predetermined power signals that have been demodulated and creating n replica signals;
a subtraction step of subtracting each of the n replica signals that have been created from each of the n multiplexed signals that have been received to calculate n subtracted signals; and
a combining step of combining the n subtracted signals that have been calculated.
5. A transmission device that performs wireless communication with a reception device by using n (n≥2) frequency channels, the transmission device comprising:
a conversion unit that converts n+1 signals into n predetermined power signals obtained by setting a carrier-to-noise ratio (C/N) to a predetermined value and into n divided signals obtained by setting the C/N to 1/n of the predetermined value and performing division into n;
a superimposition unit that superimposes the n predetermined power signals and the n divided signals converted by the conversion unit non-orthogonally so as to be n multiplexed signals for the n frequency channels; and
a transmission unit that simultaneously transmits the n multiplexed signals obtained by superimposing by the superimposition unit by the n frequency channels.
6. The transmission device according to claim 5 ,
wherein the n frequency channels are
frequency channels that are different from each other in at least one of a polarization plane and a frequency.