Communication apparatus and communication method

A communication apparatus comprising:

• a first generator that generates a first transmission signal based on an information data stream;
• a second generator that generates a second transmission signal that enables demodulation of the information data stream by being combined with the first transmission signal at a specified timing;
• a first antenna that transmits the first transmission signal;
• a second antenna that transmits the second transmission signal;
• an adjuster that adjusts a transmission timing of at least one of the first transmission signal and the second transmission signal such that the first transmission signal and the second transmission signal arrive in a specific area at specified timings;
• and
• a reporter that reports a command to move a position, to a communicating party located in the specific area, wherein:
• a time difference calculator calculates the time difference again from a time the first transmission signal arrives in an area the communicating party is located after a move, and a time the second transmission signal arrives in an area the communicating party is located after the move;
• and
• the adjustor adjusts transmission timings based on the time difference calculated again.

A communication apparatus comprising:

• a first generator that generates a first transmission signal based on an information data stream;
• a second generator that generates a second transmission signal that enables demodulation of the information data stream by being combined with the first transmission signal at a specified timing;
• a first antenna that transmits the first transmission signal;
• a second antenna that transmits the second transmission signal;
• an adjuster that adjusts a transmission timing of at least one of the first transmission signal and the second transmission signal such that the first transmission signal and the second transmission signal arrive in a specific area at specified timings;
• and
• a measurer that measures a first delay signal and a second delay time it takes a first delay signal and a second delay signal of the first transmission signal and the second transmission signal, produced by influence of multipath, to arrive in the specific area after the first transmission signal and the second transmission signal arrive,
• wherein the first and the second generators generate the first and second transmission signals based on the first and second delay times.

A communication method comprising:

• generating a first transmission signal based on an information data stream;
• generating a second transmission signal that enables demodulation of the information data stream by being combined with the first transmission signal at a specified timing;
• transmitting the first transmission signal;
• transmitting the second transmission signal;
• adjusting a transmission timing of at least one of the first transmission signal and the second transmission signal such that the first transmission signal and the second transmission signal arrive in a specific area at specified timings;
• and
• calculating a time difference between a time the first transmission signal arrives in the specific area and a time the second transmission signal arrives in the specific area;
• wherein
• the transmission timing of at least one of the first transmission signal and the second transmission signal being adjusting based on the time difference such that the first transmission signal and the second transmission signal arrive in the specific area at the specified timings;
• the time difference being calculating from a round-trip time T1 of a signal on a transmission path between the first antenna and the second antenna, and a round-trip time T2 of a signal on a transmission path between one of the first antenna and the second antenna and the specific area;
• the round-trip time T1 being calculating by using the second transmission signal which is reflected by the first antenna and received by the second antenna or the first transmission signal which is reflected by the second antenna and received by the first antenna;
• and
• the round-trip time T2 being calculating by using one of the first transmission signal which is reflected in the specific area and received by the first antenna and the second transmission signal which is reflected in the specific area and received by the second antenna.