Abstract: C-HPA separates an input signal into separated signals, and amplifies and combines the separated signals. The C-HPA includes a plurality of signal splitters, a delay discrepancy estimator, and a delay discrepancy adjuster. Each of the signal splitters splits each of the separated signals into a signal in which a time component of the separated signal is put ahead a predetermined time and a signal in which the time component is delayed the predetermined time, and outputs split signals. The delay discrepancy estimator uses the input signal, the split signals output from each of the signal splitters and the combined output signal to estimate delay discrepancy between the separated signals. The delay discrepancy adjuster uses the estimated delay discrepancy to adjust the delay discrepancy between the separated signals.

Abstract: The LINC modulator includes: a separator that generates a plurality of constant envelope signals from a source signal; a plurality of arms through which the plurality of the constant envelope signals are passed, wherein each arm includes a filter that compares frequencies of components of the constant envelope signals with a threshold frequency to generate a first signal including a first frequency part of the source signal, the first frequency part being composed of frequencies lower than a predetermined frequency; a processor that generates a second signal including a second frequency part of the source signal whose frequencies are different from the first frequency part and performs a frequency signal distortion of the second signal to generate a distorted signal; and a quadrature modulator that multiplies the first and distorted signals to reconstruct the constant envelope signals.

Abstract: A signal distributor sequentially outputs N input signals respectively corresponding to N rows of a matrix of which each has N element signals in which a predetermined matrix is obtained by dividing the matrix by a predetermined value. A coupler adds the amplified N element signals for each the input signal. A solver computes feedback signals Y* for the individual amplifiers by using an addition result Y of the outputs for each the input signal and the inverse matrix L?1 of the predetermined matrix.

Abstract: A receiving device which receives a signal transmitted from a transmitting device by using a power amplifier, the receiving device includes a calculating unit which performs distortion compensation on a symbol included in a reception signal, a delay unit which holds a signal for a result from the distortion compensation, and the calculating unit performing the distortion compensation on a second symbol at a timing later than a first symbol based on a coefficient corresponding to an amplification characteristic of the power amplifier and on the signal for the result from the distortion compensation with respect to the first symbol held by the delay unit.

Abstract: An amplifying apparatus includes: a plurality of amplifiers; a linear combiner receiving a plurality of leakage signals resulting from cross leakage between outputs of the plurality of amplifiers and performing a linear combination of level values of the plurality of leakage signals to generate a plurality of linear combination signals; and an output calculator calculating real level values of a plurality of output amplified signals of the amplifiers from level values of the linear combination signals.

Abstract: A phase correction apparatus in a wireless transmitter includes a modulator configured to modulate an in-phase component and a quadrature component of a first signal by a first carrier wave signal, a demodulator configured to demodulate a returned signal by a second carrier wave signal and generate a second signal that includes an in-phase component and a quadrature component, a phase detector configured to binarize the in-phase components and the quadrature components of the first and second signals according to signal levels, and detect a phase error between the first signal and the second signal based on combinations of the binarized signal components in the first signal and the second signal, and a phase shifter configured to phase-shift the first signal, the second signal, the first carrier wave signal, or the second carrier wave signal, based on the phase error.

Abstract: A linear amplification with nonlinear components (LINC) modulator is provided. The LINC modulator includes: a separator that generates a plurality of constant envelope signals from a source signal; a processor that receives an input signal and detects and removes a phase jump in phase trajectory of the input signal to generate a first signal having a continuous phase trajectory and a second signal having a discontinuous phase trajectory; and a quadrature modulator that mixes the first signal with the second signal to reconstruct the input signal.

Abstract: A memory effect canceller includes a sample obtaining section that obtains a plurality of discrete-time samples of a transmission signal supplied to a power amplifier that amplifies a transmission signal, a signal generation section that generates a correction signal that is a weighted linear combination, using given weighting coefficients, of partial derivatives of a transfer function of the power amplifier, wherein the transfer function has been defined in advance with a plurality of discrete-time samples as input variables, and wherein the partial derivatives are based on the discrete-time samples obtained by the sample obtaining section at respective times, and a signal correction section that corrects an output signal of the power amplifier based on the correction signal.

Abstract: An input signal to a filter device is allowed to be written into one of a plurality of sequentially connected cells if the input signal is not the zero-valued sample. Each cell receives the input signal and multiplies the input signal by one of a plurality of weight coefficients. The input signal is stopped to be written into any of the cells if the input signal is the zero-valued sample. A result of a filtering operation is output from the last cell.

Abstract: A phase correction apparatus in a wireless transmitter includes a modulator for modulating a first carrier signal by an in-phase component and a quadrature-phase component of a first signal, a demodulator for demodulating a returned signal by a second carrier signal and generating a second signal including an in-phase component and an quadrature-phase component, a phase detector for detecting a phase error between the first signal and the second signal based on the in-phase components and the quadrature-phase components of the first and second signals, and a phase shifter group for performing a phase shift based on the phase error, the phase shifter group including a first phase shifter for performing a phase shift on any of the first signal, the second signal, the first carrier signal, and the second carrier signal and a second phase shifter for shifting a phase of the first signal.

Abstract: A phase corrector in a radio transmitter includes a quadrature modulator which modulates a first carrier signal by using an in-phase component and a quadrature component of a first signal, a quadrature demodulator which demodulates a feedback signal by using a second carrier signal to generate a second signal including an in-phase component and a quadrature component, a phase detector which detects a phase error between the first signal and the second signal based on the in-phase components and the quadrature components of the first signal and the second signal, and a phase shifter which performs phase shift of any one of the first signal, the second signal, the first carrier signal and the second carrier signal based on a sum value obtained by adding to the phase error a first phase amount varying on a time base in a given phase range.

Abstract: C-HPA separates an input signal into separated signals, and amplifies and combines the separated signals. The C-HPA includes a plurality of signal splitters, a delay discrepancy estimator, and a delay discrepancy adjuster. Each of the signal splitters splits each of the separated signals into a signal in which a time component of the separated signal is put ahead a predetermined time and a signal in which the time component is delayed the predetermined time, and outputs split signals. The delay discrepancy estimator uses the input signal, the split signals output from each of the signal splitters and the combined output signal to estimate delay discrepancy between the separated signals. The delay discrepancy adjuster uses the estimated delay discrepancy to adjust the delay discrepancy between the separated signals.

Abstract: A signal distributor sequentially outputs N input signals respectively corresponding to N rows of a matrix of which each has N element signals in which a predetermined matrix is obtained by dividing the matrix by a predetermined value. A coupler adds the amplified N element signals for each the input signal. A solver computes feedback signals Y* for the individual amplifiers by using an addition result Y of the outputs for each the input signal and the inverse matrix L?1 of the predetermined matrix.

Abstract: An amplifying apparatus includes: a plurality of amplifiers; a linear combiner receiving a plurality of leakage signals resulting from cross leakage between outputs of the plurality of amplifiers and performing a linear combination of level values of the plurality of leakage signals to generate a plurality of linear combination signals; and an output calculator calculating real level values of a plurality of output amplified signals of the amplifiers from level values of the linear combination signals.

Abstract: A receiving device which receives a signal transmitted from a transmitting device by using a power amplifier, the receiving device includes a calculating unit which performs distortion compensation on a symbol included in a reception signal, a delay unit which holds a signal for a result from the distortion compensation, and the calculating unit performing the distortion compensation on a second symbol at a timing later than a first symbol based on a coefficient corresponding to an amplification characteristic of the power amplifier and on the signal for the result from the distortion compensation with respect to the first symbol held by the delay unit.

Abstract: A memory effect canceller includes a sample obtaining section that obtains a plurality of discrete-time samples of a transmission signal supplied to a power amplifier that amplifies a transmission signal, a signal generation section that generates a correction signal that is a weighted linear combination, using given weighting coefficients, of partial derivatives of a transfer function of the power amplifier, wherein the transfer function has been defined in advance with a plurality of discrete-time samples as input variables, and wherein the partial derivatives are based on the discrete-time samples obtained by the sample obtaining section at respective times, and a signal correction section that corrects an output signal of the power amplifier based on the correction signal.

Abstract: A distortion in an amplified signal obtained by amplifying a first input signal, is compensated for by applying a correction factor to the first input signal. The correction factor is updated based on the first input signal and the amplified signal. Updating the correction factor is prohibited when a value of the first input signal is same as a value of a second input signal among a plurality of input signals input previous to the first input signal.

Abstract: A phase correction apparatus in a wireless transmitter includes a modulator configured to modulate an in-phase component and a quadrature component of a first signal by a first carrier wave signal, a demodulator configured to demodulate a returned signal by a second carrier wave signal and generate a second signal that includes an in-phase component and a quadrature component, a phase detector configured to binarize the in-phase components and the quadrature components of the first and second signals according to signal levels, and detect a phase error between the first signal and the second signal based on combinations of the binarized signal components in the first signal and the second signal, and a phase shifter configured to phase-shift the first signal, the second signal, the first carrier wave signal, or the second carrier wave signal, based on the phase error.

Abstract: A phase correction apparatus in a wireless transmitter includes a modulator for modulating a first carrier signal by an in-phase component and a quadrature-phase component of a first signal, a demodulator for demodulating a returned signal by a second carrier signal and generating a second signal including an in-phase component and an quadrature-phase component, a phase detector for detecting a phase error between the first signal and the second signal based on the in-phase components and the quadrature-phase components of the first and second signals, and a phase shifter group for performing a phase shift based on the phase error, the phase shifter group including a first phase shifter for performing a phase shift on any of the first signal, the second signal, the first carrier signal, and the second carrier signal and a second phase shifter for shifting a phase of the first signal.

Abstract: A phase corrector in a radio transmitter includes a quadrature modulator which modulates a first carrier signal by using an in-phase component and a quadrature component of a first signal, a quadrature demodulator which demodulates a feedback signal by using a second carrier signal to generate a second signal including an in-phase component and a quadrature component, a phase detector which detects a phase error between the first signal and the second signal based on the in-phase components and the quadrature components of the first signal and the second signal, and a phase shifter which performs phase shift of any one of the first signal, the second signal, the first carrier signal and the second carrier signal based on a sum value obtained by adding to the phase error a first phase amount varying on a time base in a given phase range.