Nec Corporation

Masaaki Tanio

Shinichi Hori

Tomoyuki Yamase

Naoto Ishii

Wataru Hattori

Kazushi Muraoka

Norifumi Kamiya

Soubhik Deb

A parameter changing device according to the present disclosure includes: a multiplier multiplying a test signal by a back-off rate; a first distortion compensation simulation unit performing distortion compensation processing on a signal acquired by the multiplication, by using a stored parameter; a scaling unit scaling an output signal of the first distortion compensation simulation unit; a second distortion compensation simulation unit performing distortion compensation processing on the test signal, by using a parameter different from the first distortion compensation simulation unit; a differential unit calculating an error between a value of a signal acquired by the scaling and a value of an output signal of the second distortion compensation simulation unit; an approximation error minimization unit calculating a parameter of the second distortion compensation simulation unit minimizing the error; and an output unit outputting a parameter of the second distortion compensation simulation unit to a distortion compensation unit.

Parameter changing device, parameter changing method, and non-transitory computer readable medium

A delta-sigma modulation apparatus performs delta-sigma modulation on a first signal as an input signal and outputs a second signal, outputs, using the second signal and a third signal generated through a transmission process of the second signal, a fourth signal that is an approximated value of a signal which is generated through at least part of the transmission process, and performs the delta-sigma modulation on the first signal using the fourth signal and outputs the second signal.

Delta-sigma modulation apparatus, delta-sigma modulation method, and recording medium

An input signal is input to a main power amplifier and an auxiliary power amplifier. A combiner is connected to an output of the main power amplifier and an output of the auxiliary power amplifier. The combiner includes an impedance converter, first and second lumped elements. The impedance converter is connected to a combining point. The first lumped element is connected between the output of the main power amplifier and the combining point. The second lumped element is connected between the output of the auxiliary power amplifier and the combining point. A line length between the output of the main power amplifier and the combining point is the same as that between a line length between the output of the auxiliary power amplifier and the combining point.

Doherty power amplifier

A parameter determination apparatus adds a third layer between first and second layers of the neural network. The third layer includes a third node not including a non-linear activation function. Outputs of first nodes of the first layer is inputted to the third node The number of the third node of the third layer is smaller than the number of second nodes of the second layer. The parameter determination apparatus further learns a weight between the third and second layers as a part of the parameters and selects, as a part of the parameters, one valid path used as a valid connecting path in the neural network for each second node from connecting paths that connect the third node and the second nodes on the basis of the learned weight.

Parameter determination apparatus, signal transmission apparatus, parameter determination method, signal transmission method and program recording medium

A signal transmission apparatus () includes: a distortion compensation unit () for performing a distortion compensation processing on an input signal (x) by using a Neural Network () including L+1 arithmetic layers that include L (L is a variable number representing an integer equal to or larger than 1) hidden layer (M) and an output layer (O); a storage unit () for storing parameter sets () each of which includes a parameter for Q (Q is a variable number representing an integer equal to or smaller than L) arithmetic layer of the L+1 arithmetic layers; and an application unit () for selecting one parameter set from the parameter sets based on a signal pattern of the input signal and applying the parameter included in the selected one parameter set to the M number of arithmetic layer, a parameter of another arithmetic layer of the L+1 arithmetic layers, which is other than the Q arithmetic layer, is fixed.

Signal transmission apparatus, parameter determination apparatus, signal transmission method, parameter determination method and recording medium

A parameter determination apparatus () includes: a first learning device () learning a weight between a [j&#x2212;1]-th layer (j is an integer that satisfies a condition that '2&#x2264;j&#x2264;the number of the layer') and a [j]-th layer to which an output of the [j&#x2212;1]-th layer is inputted among a plurality of layers of a neural network; a selecting device () selecting at least one valid path for each node included in the [j]-th layer from a plurality of connection paths that connect nodes in the [j&#x2212;1]-th layer and nodes in the [j]-th layer, respectively, on the basis of the weight learned by the first learning device; and a second learning device () learning at least one of the weight and a bias as the parameters relating to a network structure between the [j&#x2212;1]-th layer and the [j]-th layer on the basis of the sample signal, the label signal and the valid path.

Parameter determination apparatus, signal transmission apparatus, parameter determination method, signal transmission method and recording medium

An in-band extraction unit is configured to extract an in-band from an output signal. An out-band extraction unit is configured to extract at least one pair of out-bands including a low frequency side out-band and a high frequency side out-band from the output signal. An ADC is configured to convert the extracted in-band and out-bands to digital signals. A signal processing unit is configured to process information included in the digital signals converted by the analog to digital converter and adjust an operation of predistorting an input baseband digital signal to generate the output signal.

Amplifier, configuration method of amplifier, and communication apparatus

This transmitter is provided with: a digital delay circuit which delays a 1-bit digital RF signal on the basis of another 1-bit digital RF signal; an amplifier which amplifies a signal output by the digital delay circuit; and a band-pass filter which allows signals in a prescribed frequency band, from among signals output by the amplifier, to pass. A signal output by the band-pass filter is input into a corresponding one antenna element from among a plurality of antenna elements, and controls the directionality of a beam formed by the plurality of antenna elements.

Transmitter and method of controlling transmitter

A second-order &#x394;&#x3a3; modulator includes: a two-stage integrator; a first arithmetic operation circuit; and a second arithmetic operation circuit. The two-stage integrator includes a plurality of adder arrays, each of which includes a plurality of adders. The plurality of adder arrays includes first to fourth adder arrays. An output of a last stage of the second adder array is fed back as an input of a first stage of the first adder array. An output of a last stage of the fourth adder array is fed back as an input of a first stage of the third adder array. A sum bit string obtained in the first adder array is input to the third adder array. A sum bit string obtained in the second adder array is input to the fourth adder array.

Second-order &#x394;&#x3a3; modulator, radio, and signal processing method performed by second-order &#x394;&#x3a3; modulator

A transmitter includes a plurality of transmitter circuits configured to generate signals that are within the same frequency band; and a feedback circuit that is shared by the plurality of transmitter circuits, the feedback circuit being configured to feed back a part of a transmission amplification signal to a transmitter circuit, the transmission amplification signal being output from each of the plurality of transmitter circuits through a transmission amplifier, and the transmitter circuit being configured to output the transmission amplification signal among the plurality of transmitter circuits. The feedback circuit includes a frequency selective extraction unit configured to extract different-band signals in frequency bands from the transmission amplification signal, the frequency bands being different from each other, a synthesis unit configured to synthesize the different-band signals extracted by the frequency selective extraction unit, and to generate a synthesis signal, a frequency conversion unit configured to frequency-convert the synthesis signal generated by the synthesis unit by using a local signal of the same frequency, the local signal being common to a plurality of transmission paths, and a distortion compensation coefficient calculation unit configured to calculate a distortion compensation coefficient based on signals of frequency bands of the different-band signals, the distortion compensation coefficient being used when compensating for distortion of signals in outputs of the plurality of transmitter circuits.

Transmitter, communication system, control method, and program

A transmitter includes: a transmission circuit that outputs, via a transmission amplifier, transmission signals of a same frequency band; and a feedback circuit that feeds back, to the transmission circuit, a distortion compensation coefficient that is used to compensate for distortion of the transmission signals. The feedback circuit includes: a delay circuit that delays each of the transmission signals by a different amount of time; a combining unit that combines the delayed transmission signals to generate a combined signal; a signal conversion unit that converts a frequency of the combined signal to a different frequency using a local signal that is common among the transmission signals, and generates a demodulated digital signal from the combined signal of which the frequency has been converted; and a distortion compensation calculation unit that calculates the distortion compensation coefficient based on the demodulated digital signal.

Transmitter, communication system, and method and program for controlling transmitter

A second-order &#x394;&#x3a3; modulator includes a plurality of integrators and a parallel higher-bit processing part, and the parallel higher-bit processing part includes a plurality of addition and determination processing sections. The addition and determination processing section receives first and second carry inputs and first and second state inputs, and outputs a quantized output and first and second state outputs. A first selector selects one set from sets of the first and the second state outputs from the plurality of addition and determination processing sections and outputs the selected set, and a second selector selects one quantized output from the quantized outputs from the plurality of addition and determination processing sections. An output of the first selector is used as a selection control signal for the first and the second selectors.

Second-order delta-sigma modulator and transmission apparatus

The purpose of the present invention is to provide an amplifier having high signal-to-noise ratio of a transmitted signal and high electrical efficiency. Another purpose is to suppress complexity of amplifier's wiring connecting a signal generator that generates a binary digital signal and an amplification unit that amplifies the same. This amplifier generates a binary digital signal. The amplifier further generates a K-value digital signal (K is an integer greater than or equal to 3) from the binary digital signal and generating a plurality of binary digital signals from the K-value digital signal. The amplifier amplifies each of the plurality of binary digital signals, and combines the plurality of amplified binary digital signals and generating a combined signal having a substantially proportional relationship with the K-value digital signal.

Amplifier and transmitter, and transmission method

This &#x394;&#x3a3; modulator is a &#x394;&#x3a3; modulator using multiple integrators. The integrator: includes a plurality of stages of adder sequences, each of the adder sequences including a plurality of adders connected in series; performs feedback of a result of a second adder sequence as an input to a first adder sequence, the first adder sequence being a first stage of the plurality of stages, and the second adder sequence being a last stage of the plurality of stages; and processes inputs supplied to the plurality of adders of the first adder sequence and supplies it to the second adder sequence.

Delta-sigma modulator, transmitter, and integrator

In a digital transmitter, a digital RF signal generation unit executes digital modulation on I and Q signals to convert the I and Q signal into first and second digital RF signals, respectively, with a bit rate which is twice a carrier frequency. A retiming unit delays the first digital RF signal according to a clock signal with a frequency which is 4n times (n is an integer) the carrier frequency to output the delayed first digital RF signal and delays the phase of the second digital RF signal by 90 degrees with respect to an output of the first digital RF signal to output the delayed second digital RF signal. First and second amplifiers amplify the first and second digital RF signals output by the retiming unit, respectively. A combiner combines the amplified first and second digital RF signals to generate one signal sequence.

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Tokyo, Japan

Masaaki Tanio