Mitsubishi Electric Research Laboratories, Inc.

Rui Ma

Koon Hoo Teo

Daniel Antonio Da Costa Dinis

Chunjie Duan

Qiuyao Zhu

Mouhacine Benosman

SungWon Chung

Toshiaki Koike-Akino

Yukimasa Nagai

Philip Orlik

Bingnan Wang

Pu Wang

Chouaib Kantana

Richard C Waters

Omer Tanovic

Zhengyu Peng

Kyeongjin Kim

Haoyu Fu

Sushmit Goswami

Peijie Feng

Sravan Kumar Pulipati

Sheikh Nijam Ali

Jin Shao

Soyeon Jeong

Koushik Manjunatha

Sufeng Niu

An auto-tuning controller for improving a performance of a power amplifier system is provided. The controller includes an interface including input terminals and output terminals, the interface being configured to acquire input signal conditions of power amplifiers (PAs), a training circuit including a processor and a memory running and storing a Digital Doherty amplifier (DDA) controller (module), a DPD controller (module) and a DDA-DPD neural network (NN). The training circuit is configured to perform sampling the input signal conditions, and selecting a DPD model from a set of polynomial models for the DPD controller and a set of DDA optimization variables for the DDA controller, using optimized DPD model and DDA coefficients, wherein the optimized DPD model and DDA coefficients are provided by performing an offline optimization for the DPD model and DDA coefficients based on a predetermined optimization method, collecting the optimized DPD coefficients and optimized DDA optimization variables, generating online-DDA optimal coefficients and DPD optimal coefficients using a trained DDA-DPD NN, and updating the generated optimal DDA and DPD coefficients via the output terminals of the interface.

Deep learning-based online adaptation of digital pre-distortion and power amplifier systems

An autotuning controller is provided for improving power efficiency and linearity of digital power amplifiers (DPAs). The controller includes an interface including input and output terminals connected to the DPAs, the interface being configured to acquire input signals and output signals, a digital pre-distortion (DPD)-DPA adaptive controller including a processor and a memory running and storing a DPD algorithm, an efficiency enhancement method and a learning cost function. The DPD adaptive controller is configured to perform steps of computing DPD coefficients to define a learning cost function based on a DPD model by use of a data-driven optimization method, wherein the leaning cost function includes both variables of a DDA performance and a DPD performance, updating the learning cost function based on the DPD performance, optimizing the updated learning cost function by solving the updated learning cost function with respect to the variables of the DDA performance, and providing optimal parameters for DPA and DPD via the interface.

Interactive online adaptation for digital pre-distortion and power amplifier system auto-tuning

A Digital Power-Amplifier (DPA) system includes a power amplifier (PA) circuit having control inputs and an output for generating output signals, and an adaptive control circuit that comprises an input interface, an output interface, a memory storing an adaptive control algorithm and a processor performing instructions based on the adaptive control algorithm in connection with the memory, wherein the input interface receives input-state signals and output signals of the DPA circuit, wherein the adaptive control algorithm determines, in response to the input-state signals and the output signals, control parameters of control signals transmitted to the control inputs from the output interface for controlling operations of the DPA circuit.

Power amplifier system and transfer learning-based autotuning optimization method thereof

An all-digital transmitter (ADT) is provided. The ADS includes a baseband interface configured to store and transmit an (baseband) input signal at a corresponding frequency band, a polyphase finite impulse response filter configured to receive and convert the baseband input signal into different phases, a digital upconverter configured to upconvert each of the different phase baseband input signal to a predetermined carrier frequency in a digital domain, a set of multi-core 2-dimensional network-resonant digital plane wave beamfilters, wherein each of the multi-core 2D NR-DPW beamfilters is configured to transmit the upconverted baseband input signal by a target angle, a multi-core delta-sigma modulator configured to encode the upconverted input signal into pulsating signals, and a serializer configured to serialize the encoded pulsating signals into a RF bitstream.

All-digital transmitter with wideband beamformer

An encoder of a terahertz (THz)-based absolute positioning system used for decoding patterns from THz-band measurements. The encoder includes a scale with a multi-layer reflective/transmissive structure having a matrix with rows. Each row of the matrix corresponds to a plurality of patterns, such that each pattern is used to form a measurement. An emitter emits a THz waveform to the scale. A receiver is used to measure amplitudes of the THz waveform reflected from the scale. A memory stores data including predetermined positions of the emitter based on the patterns of the layers from the scale. Wherein one or more processors can determine a position of the emitter from the measurements of the amplitudes received by the receiver, based on the stored data. An output interface can be used to render the position of the emitter.

Methods and systems for terahertz-based positioning

A radio frequency (RF) transmitter includes a set of input ports to receive baseband samples of a signal to be transmitted on a set of disjoint frequency bands, a set of filter banks, there is one filter bank for each input port, each filter bank includes a plurality of digital polyphase interpolation filters to sample a shifted phase of the corresponding sequence of baseband samples and to interpolate the sampled phases to produce a plurality of sequences of interpolated baseband phased samples with the shifted phase, and a set of oscillators banks, each oscillator bank includes a plurality of polyphase Digital Direct Synthesizer (DDS) corresponding to the plurality of digital polyphase interpolation filters to generate a plurality of sequences of samples of digital waveform. The RF transmitter includes a set of mixer banks to mix corresponding sequences of samples of digital waveform and interpolated baseband phased samples to up convert each sequence of interpolated baseband phased samples to the effective frequency, a parallel digital combiner to combine in-phase sequences of interpolated baseband phased samples of different frequency bands to produce a plurality of sequences of multiband upconverted samples, and a pulse encoder to modulate and encode the plurality of sequences of multiband upconverted samples to produce a plurality of encoded multi-band signals. The RF transmitter converts the plurality of encoded multi-band signals into a RF bitstream and radiate the RF bitstream as an analog signal.

Mixed-mode millimeter-wave transmitter

System and method for generating high speed digitized-RF signals

A radio frequency (RF) transmitter includes a set of input ports to receive baseband, a set of filter banks for each input port that includes a plurality of digital polyphase interpolation filters, and a set of oscillators banks, wherein each oscillator bank includes a plurality of polyphase Digital Direct Synthesizer (DDS) corresponding to the plurality of digital polyphase interpolation filters. The RF transmitter includes a set of mixer banks to mix corresponding sequences of samples of digital waveform, a parallel digital combiner to combine in-phase sequences of interpolated baseband phased samples, and a pulse encoder to modulate and encode the plurality of sequences of multiband upconverted samples. The RF transmitter converts a plurality of encoded multi-band signals into a RF bitstream and an E/O interface to convert the RF bitstream.

High speed digital bit generator for optical frontal interface

Power amplifier system and learning-based autotuning method thereof

A transmitter including radio-frequency (RF) chains. Each RF chain includes a power amplifier, a band-pass filter, and an antenna for transmitting an analog signal using a beamforming with an angle of departure (AOD) defined by phase shifts of the analog signals transmitted by the RF chains. A processor to determine digital signals for transmission from the RF chains. Wherein there is one-to-one correspondence between a digital signal and an RF chain. An encoder to encode the digital signals with binary codes to produce a set of encoded digital signals and to combine the encoded digital signals into a combined digital signal. A digital-to-analog converter to convert the combined digital signal into an analog domain to produce a combined analog signal. A decoder to decode, using the binary codes, the combined analog signal into a set of analog signals and to submit the analog signals into the corresponding RF chains.

Digital beamforming transmitter array system with hardware sharing and reduction

Multi-band radio frequency transmitter

A distortion mitigation quantizer circuit includes a pre-quantizer to generate a first quantized signal having L output signal levels from an input signal and a digital pulse-width-modulation (PWM) circuit to modulate the first quantized signal using M modulating carriers with PWM carrier frequency fand according to an over sampling ratio (OSR) N in order to generate a second quantized signal. In this case, a number of the modulating carriers M is substantially equal to twice L/N.

Noise mitigating quantizer for reducing nonlinear distortion in digital signal transmission

A digital transmitter includes baseband interfaces to generate digital baseband signals with baseband frequencies, digital-upconverting stages to upconvert the baseband frequencies to first radio frequencies having a predetermined frequency range, a M-Band &#x394;&#x3a3;M modulator to modulate the up-stage signals based on noise shaping and noise quantization processes, delay registers to align phases of the modulated up-stage signals, a noise canceler to generate noise canceling signals with a converted polarity, a Switch Mode Power Amplifier to amplify the phase aligned modulated up-stage signals up to a predetermined power level, a linear power amplifier to amplify the noise canceling signals up to the predetermined power level, a power combiner to combine to generate transmitting signals by combining the amplified phase aligned modulated up-stage signals and the amplified noise canceling signals, and an antenna to transmit the transmitting signals.

Methods and system of a digital transmitter with reduced quantization noise

A radio frequency transmitter for wireless communication includes a plurality of input ports to receive a plurality of sequences of baseband symbols to be transmitted on a plurality of disjoint frequency bands, a power encoder to modulate and encode the plurality of sequences of baseband symbols to produce an encoded multi-band signal including the plurality of disjoint frequency bands carrying the plurality of sequences of baseband symbols, a first power amplifier for amplifying the encoded multi-band signal to produce an amplified encoded multi-band signal, a first noise canceller to generate a first noise mitigation signal from the encoded multi-band signal and the plurality of sequences of baseband symbols, a first power combiner to combine the amplified encoded multi-band signal and the first noise mitigation signal to produce an RF multi-band signal, and an antenna for transmitting the RF multi-band signal.

Inter-band CA digital transmitter with multi-stage out-of-band noise canceller

A wideband power amplifier includes a set of amplifiers connected in parallel to amplify signals from input ports of the amplifiers, a matching network configured to match the signals amplified by the amplifiers with predetermined load values, the matching network having a first impedance frequency response as a monotonically decreasing function of frequency of the amplified signals in a target operation frequency range, a converter network configured to convert the signals matched by the matching network, and an impedance flattening network having a second impedance frequency response as a monotonically increasing function of frequency of the amplified signals in the target operation frequency range.

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Somerville, MA, United States of America

Rui Ma