Wireless communication system, receiving apparatus, transmitting apparatus, wireless communication method, receiving method, and transmitting method

A receiving apparatus of a MIMO (Multiple-Input Multiple-Output) communication system that uses a plurality of antennas to form a plurality of fixed transmission channels, the receiving apparatus comprising:

• an interference canceller that performs signal processing for eliminating an interference component between two mutually orthogonal polarizations of radio waves by adaptive control on signals received by respective antennas on a receiving side;
• and
• a MIMO signal processing circuit that is connected to the interference canceller and performs signal processing for MIMO spatial demultiplexing independent of the signal processing of the interference canceller,
• wherein the MIMO wireless communication system is a fixed system that performs deterministic MIMO transmission in a fixed line-of-sight environment, the plurality of fixed transmission channels are line-of-sight deterministic communication channels, and an installation spacing of the plurality of antennas is set so that signals transmitted from two antennas on a transmitting side are received by a single antenna on the receiving side with a predetermined phase difference,
• wherein the interference canceller and the MIMO signal processing circuit are connected in cascade and the MIMO signal processing circuit is arranged in a stage subsequent to the interference canceller.

A wireless communication method of a MIMO (Multiple-Input Multiple-Output) communication system that uses a plurality of antennas to form a plurality of fixed transmission channels, the method comprising:

• performing MIMO spatial multiplexing as well as dual polarization transmission of transmitting two independent signals in the same band by using two mutually orthogonal polarizations of radio waves as signals to be transmitted from respective antennas on a transmitting side;
• and
• performing signal processing for eliminating an interference component between the polarizations by adaptive control on signals received by respective antennas on a receiving side and signal processing for demultiplexing of the MIMO spatial multiplexing independently of each other,
• wherein the MIMO wireless communication system is a fixed system that performs deterministic MIMO transmission in a fixed line-of-sight environment, the plurality of fixed transmission channels are line-of-sight deterministic communication channels, and an installation spacing of the plurality of antennas is set so that signals transmitted from two antennas on the transmitting side are received by a single antenna on the receiving side with a predetermined phase difference,
• wherein the MIMO spatial multiplexing is performed subsequently to the performing of the signal processing for eliminating an interference component.

A demodulator of a MIMO (Multiple-Input Multiple-Output) communication system that uses a plurality of antennas to form a plurality of fixed transmission channels, the demodulator comprising:

• an interference canceller that performs signal processing for eliminating an interference component between two mutually orthogonal polarizations of radio waves by adaptive control;
• and
• a MIMO signal processing circuit that is connected to the interference canceller and performs signal processing for MIMO spatial demultiplexing independent of the signal processing of the interference canceller,
• wherein the MIMO wireless communication system is a fixed system that performs deterministic MIMO transmission in a fixed line-of-sight environment, the plurality of fixed transmission channels are line-of-sight deterministic communication channels, and an installation spacing of the plurality of antennas is set so that signals transmitted from two antennas on a transmitting side are received by a single antenna on a receiving side with a predetermined phase difference,
• wherein the interference canceller and the MIMO signal processing circuit are connected in cascade and the MIMO signal processing circuit is arranged in a stage subsequent to the interference canceller.

A signal processing circuit of a MIMO (Multiple-Input Multiple-Output) communication system that uses a plurality of antennas to form a plurality of fixed transmission channels, the signal processing circuit comprising:

• an interference canceller that performs signal processing for eliminating an interference component between two mutually orthogonal polarizations of radio waves by adaptive control;
• and
• a MIMO signal processing circuit that is connected to the interference canceller and performs signal processing for MIMO spatial demultiplexing independent of the signal processing of the interference canceller,
• wherein the MIMO wireless communication system is a fixed system that performs deterministic MIMO transmission in a fixed line-of-sight environment, the plurality of fixed transmission channels are line-of-sight deterministic communication channels, and an installation spacing of the plurality of antennas is set so that signals transmitted from two antennas on a transmitting side are received by a single antenna on a receiving side with a predetermined phase difference,
• wherein the interference canceller and the MIMO signal processing circuit are connected in cascade and the MIMO signal processing circuit is arranged a stage subsequent to the interference canceller.