Abstract: A wireless communication system includes: a transmission apparatus that transmits a wireless signal including a plurality of wireless transmission signals, by using a plurality of transmitting antenna elements; and a reception apparatus that receives the wireless signal, as a plurality of wireless reception signals, by using a plurality of receiving antenna elements. The reception apparatus generates a plurality of separated reception signals by performing a signal separation process on the plurality of wireless reception signals, generates correlation information about the separated reception signals, and generates phase control information on the basis of the correlation information. The transmission apparatus generates the plurality of synthesized transmission signals by performing the signal synthesis process on the plurality of transmission signals, and adjusts the phase of each of the synthesized transmission signals, by a phase shift amount calculated on the basis of the phase control information.

Abstract: Provided is a signal modulation apparatus configured to modulate an input signal into a multidimensional QAM signal using multidimensional QAM, in which Multidimensional QAM is QAM in which two-dimensional QAM is configured in a multidimensional manner using a plurality of consecutive time slots, a constellation for multidimensional QAM is part of a combination of a constellation of first two-dimensional QAM, and a constellation of second two-dimensional QAM.

Abstract: An OAM mode-multiplexing transmitting apparatus includes an OAM transmitting processing unit, a phase adjustment unit, a transmitting radio unit, a UCA (Uniform Circular Array) antenna, and a control unit (control apparatus). The UCA antenna includes a plurality of transmitting antenna elements. In the control apparatus, an acquisition unit acquires “information corresponding to a transmitting-side axis misalignment”. A beam control unit controls a beam of the UCA antenna by controlling phases of N OAM mode-multiplexing signals based on the acquired “information corresponding to the transmitting-side axis misalignment”.

Abstract: Provided is a signal modulation apparatus configured to modulate an input signal into a multidimensional QAM signal using multidimensional QAM, in which Multidimensional QAM is QAM in which two-dimensional QAM is configured in a multidimensional manner using a plurality of consecutive time slots, a constellation for multidimensional QAM is part of a combination of a constellation of first two-dimensional QAM, and a constellation of second two-dimensional QAM.

Abstract: An OAM reception apparatus (30) includes an OAM reception unit (34) and an interference compensation unit (35C) that are independent of each other. The OAM reception unit (34) and the interference compensation unit (35C) execute “OAM reception processing” and “interference compensation processing”, respectively, based on a plurality of vertical component signals and a plurality of horizontal component signals obtained by performing polarization separating and down-conversion on a plurality of reception radio signals received by a plurality of reception antenna elements (31-1 to 31-4).

Abstract: An antenna device includes a plurality of antenna elements. Each of the plurality of antenna elements outputs radio signals transmitted to another antenna device arranged so as to be opposed to the antenna device. At least one of the plurality of antenna elements is configured in such a way that a polarization direction of the radio signals to be output can be switched between a first direction and a second direction that is orthogonal to the first direction.

Abstract: A control device causes a first transmission system in a MIMO transmission device to transmit a first transmitting-end clock transmission signal (first transmission signal), causes a second transmission system to transmit a second transmission signal, and causes the first transmission system to transmit a third transmission signal. The control device acquires a first phase value and a second phase value. The first phase value is a phase value of the second transmission signal received in the second reception system operating based on a receiving-end clock signal synchronous with a transmitting-end clock signal by the first transmission signal. The second phase value is a phase value of the third transmission signal received in the second reception system in synchronous operation. The control device calculates a first correction value for correcting a first delay amount set value of a delay adjustment processing unit based on the first and second phase values.

Abstract: An OAM reception apparatus (30) includes an OAM reception unit (34) and an interference compensation unit (35C) that are independent of each other. The OAM reception unit (34) and the interference compensation unit (35C) execute “OAM reception processing” and “interference compensation processing”, respectively, based on a plurality of vertical component signals and a plurality of horizontal component signals obtained by performing polarization separating and down-conversion on a plurality of reception radio signals received by a plurality of reception antenna elements (31-1 to 31-4).

Abstract: Provided is a radio transmission device, a baseband processing device, a radio transmission method, and a radio reception device that can reduce the peak to average power ratio in multiplex transmission using the OAM transmission system. In a baseband processing device (10), a signal formation unit (11) forms N number of multiplex signals corresponding to N number of antenna devices (32) by multiplying M number (M is a natural number equal to or larger than 2) of data symbols that are different from and parallel to each other by a “corrected weighting matrix”. The “corrected weighting matrix” is obtained by adding the phase rotation matrix for suppressing the peak to a fixed OAM basic weighting matrix.

Abstract: An interference compensation unit in an OAM reception apparatus removes the interference component caused by horizontally polarized waves relative to vertically polarized waves from a first mode vertical component reception signal obtained by an OAM reception unit using both a first mode horizontal component reception signal and a second mode horizontal component reception signal.

Abstract: An interference compensation unit in an OAM reception apparatus removes the interference component caused by horizontally polarized waves relative to vertically polarized waves from a first mode vertical component reception signal obtained by an OAM reception unit using both a first mode horizontal component reception signal and a second mode horizontal component reception signal.

Abstract: Provided is a radio transmission device, a baseband processing device, a radio transmission method, and a radio reception device that can reduce the peak to average power ratio in multiplex transmission using the OAM transmission system. In a baseband processing device (10), a signal formation unit (11) forms N number of multiplex signals corresponding to N number of antenna devices (32) by multiplying M number (M is a natural number equal to or larger than 2) of data symbols that are different from and parallel to each other by a “corrected weighting matrix”. The “corrected weighting matrix” is obtained by adding the phase rotation matrix for suppressing the peak to a fixed OAM basic weighting matrix.

Abstract: An antenna device includes a plurality of antenna elements. Each of the plurality of antenna elements outputs radio signals transmitted to another antenna device arranged so as to be opposed to the antenna device. At least one of the plurality of antenna elements is configured in such a way that a polarization direction of the radio signals to be output can be switched between a first direction and a second direction that is orthogonal to the first direction.

Abstract: A control device causes a first transmission system in a MIMO transmission device to transmit a first transmitting-end clock transmission signal (first transmission signal), causes a second transmission system to transmit a second transmission signal, and causes the first transmission system to transmit a third transmission signal. The control device acquires a first phase value and a second phase value. The first phase value is a phase value of the second transmission signal received in the second reception system operating based on a receiving-end clock signal synchronous with a transmitting-end clock signal by the first transmission signal. The second phase value is a phase value of the third transmission signal received in the second reception system in synchronous operation.

Abstract: A phase noise compensation apparatus is used for a demodulation apparatus for demodulating a transmission signal modulated by a modulation scheme that uses phase information for data identification. A phase detector detects a phase error of a reception pilot symbol sequence included in a reception symbol sequence. A first filter refers to the phase error detected in a time series manner and sequentially estimates first phase noise components. A second filter refers to the phase error detected in a reverse time series manner and sequentially estimates second phase noise components. The synthesis processing unit estimates a phase noise component of a reception symbol based on an estimated value of the first phase noise component, an estimated value of the second phase noise component, and the phase error. The phase rotator rotates a phase of the reception symbol based on the estimated phase noise component of the reception symbol.

Abstract: A phase noise compensation apparatus is used for a demodulation apparatus for demodulating a transmission signal modulated by a modulation scheme that uses phase information for data identification. A phase detector detects a phase error of a reception pilot symbol sequence included in a reception symbol sequence. A first filter refers to the phase error detected in a time series manner and sequentially estimates first phase noise components. A second filter refers to the phase error detected in a reverse time series manner and sequentially estimates second phase noise components. The synthesis processing unit estimates a phase noise component of a reception symbol based on an estimated value of the first phase noise component, an estimated value of the second phase noise component, and the phase error. The phase rotator rotates a phase of the reception symbol based on the estimated phase noise component of the reception symbol.

Abstract: To enable a large-capacity, high-quality data communication that is excellent in bit error rate characteristic even in an adverse noise environment mainly caused by phase noises or thermal noises. [Solution] Included are: a first phase error detection filter that generates, on the basis of a forward sequence of received symbols, a first phase difference value and a first phase error estimated value; a second phase error detection filter that generates, on the basis of a backward sequence of received symbols, a second phase difference value and a second phase error estimated value; a phase error combination means that generates a third phase error estimated value on the basis of the first and second phase error estimated values and one of the first and second phase difference values; and a phase error compensation means that compensates the phase error of the received symbols in accordance with the third phase error estimated value.

Abstract: To enable a large-capacity, high-quality data communication that is excellent in bit error rate characteristic even in an adverse noise environment mainly caused by phase noises or thermal noises. [Solution] Included are: a first phase error detection filter that generates, on the basis of a forward sequence of received symbols, a first phase difference value and a first phase error estimated value; a second phase error detection filter that generates, on the basis of a backward sequence of received symbols, a second phase difference value and a second phase error estimated value; a phase error combination means that generates a third phase error estimated value on the basis of the first and second phase error estimated values and one of the first and second phase difference values; and a phase error compensation means that compensates the phase error of the received symbols in accordance with the third phase error estimated value.

Abstract: The present invention provides a carrier wave reproduction device in which bit-error characteristics are improved without decreasing transmission capacity.

Abstract: The present invention provides a carrier wave reproduction device in which bit-error characteristics are improved without decreasing transmission capacity.