Wireless communication system, relay apparatus and wireless communication method

1 . A wireless communication system comprising a first communication apparatus, a second communication apparatus, and a mobile relay apparatus, wherein

the relay apparatus comprises;

a plurality of first antennas;

a plurality of second antennas;

a receiver that receives data wirelessly transmitted by the first communication apparatus through the plurality of first antennas;

a storage that stores the data received by the receiver; and

a transmitter that wirelessly transmits the data stored by the storage to the second communication apparatus through the plurality of second antennas, and

the second communication apparatus comprises;

a plurality of third antennas; and

a relay data receiver that receives the data wirelessly transmitted by the relay apparatus through the plurality of third antennas;

wherein the receiver receives a first wireless signal in which the data has been set through the plurality of first antennas,

the storage stores, in association,

waveform data representing a waveform of the first signal received through each of the plurality of first antennas,

a reception time of the first signal, and

an antenna identifier of a first antenna, among the plurality of first antennas, which received the first signal, and

the transmitter wirelessly transmits a second signal representing the waveform data, the reception time and the antenna identifier stored in the storage through the plurality of the second antennas, and

the relay data receiver comprises:

a second signal receiver that receives the second signal wirelessly transmitted by the relay apparatus through the plurality of third antennas;

a second signal reception processor that synthesizes the second signal received by the second signal receiver through each of the plurality of third antennas and performs processing of receiving the synthesized second signal to acquire the waveform data corresponding to each of the plurality of first antennas; and

a first signal reception processor that demodulates the first signal represented by the waveform data acquired by the second signal reception processor with respect to each of the plurality of first antennas and decodes a signal obtained by synthesizing demodulation results with respect to the plurality of first antennas to acquire the data.

2 . The wireless communication system according to claim 1 , wherein

the transmitter wirelessly transmits the data stored in the storage through the second antennas at a timing when communication with the plurality of second communication apparatus is possible.

3 . The wireless communication system according to claim 1 , wherein

the first signal reception processor performs the processing of receiving by a plurality of wireless methods.

4 . The wireless communication system according to claim 1 , wherein

the relay apparatus is provided in an air vehicle flying over the sky, and

the first communication apparatus and the second communication apparatus are installed on the Earth.

5 . The wireless communication system according to claim 4 , wherein

the air vehicle is a low Earth orbit satellite.

6 . The wireless communication system according to claim 1 ,

wherein the storage stores the waveform data representing the waveform of the first signal without demodulating the first signal received through each of the plurality of first antennas.

7 . The wireless communication system according to claim 1 ,

wherein the storage stores in advance a weight for each transmission time of the data transmitted through the plurality of second antennas, and

wherein the transmitter weights the data stored in the storage by the weight stored in the storage, and transmits the weighted data to the second communication apparatus through the plurality of second antennas.

8 . The wireless communication system according to claim 1 , wherein

the transmitter collectively transmits, to the second communication apparatus through the plurality of second antennas, the second signal regarding the first signal received so far from the first communication apparatus while the second communication apparatus is included in an area in which the relay apparatus can perform communication.

9 . A relay apparatus in a wireless communication system including a first communication apparatus, a second communication apparatus, and the mobile relay apparatus,

the relay apparatus comprising:

a plurality of first antennas;

a plurality of second antennas;

a receiver that receives data wirelessly transmitted by the first communication apparatus through the plurality of first antennas;

a storage that stores the data received by the receiver, and

a transmitter that wirelessly transmits the data stored by the storage to the second communication apparatus, which receives the data using a plurality of third antennas, through the plurality of second antennas,

wherein the receiver receives a first wireless signal in which the data has been set through the plurality of first antennas,

the storage stores, in association,

waveform data representing a waveform of the first signal received through each of the plurality of first antennas,

a reception time of the first signal, and

an antenna identifier of a first antenna, among the plurality of first antennas, which received the first signal, and

the transmitter wirelessly transmits a second signal representing the waveform data, the reception time and the antenna identifier stored in the storage through the plurality of the second antennas.

10 . A wireless communication method executed by a relay apparatus in a wireless communication system including a first communication apparatus, a second communication apparatus, and the mobile relay apparatus,

the wireless communication method comprising:

receiving data wirelessly transmitted by the first communication apparatus through a plurality of first antennas comprised in the relay apparatus;

storing, in a storage of the relay apparatus, the received data; and

wirelessly transmitting the stored data to the second communication apparatus, which receives the data using a plurality of third antennas comprised in the second communication apparatus, through a plurality of second antennas comprised in the relay apparatus,

wherein, in the receiving of the data, the relay apparatus receives a first wireless signal in which the data has been set through the plurality of first antennas,

wherein, in the storing of the received data, the relay apparatus makes the storage store

waveform data representing a waveform of the first signal received through each of the plurality of first antennas,

a reception time of the first signal, and

an antenna identifier of a first antenna, among the plurality of first antennas, which received the first signal,

wherein, in the transmitting of the stored data, the relay apparatus wirelessly transmits a second signal representing the waveform data, the reception time and the antenna identifier stored in the storage through the plurality of the second antennas.