53 results about "Spectral shaping" patented technology

An apparatus receiving, from a network node, a configuration message for frequency domain spectral shaping, wherein the configuration message is indicative of at least one or more filter parameters; determining a frequency domain window function according to the one or more filter parameters; and transmitting an uplink transmission applying the determined frequency domain window function.

The invention belongs to the technical field of mobile communication, and particularly relates to an orthogonal time-frequency air conditioning-based integrated waveform design method, which comprises the following steps of: constructing a receiving and transmitting filter bank with a frequency spectrum shaping characteristic on a time domain level, converting an item with a complex analytic expression in a traditional architecture into a scaling factor capable of being linearly processed, and carrying out linear processing on the scaling factor; architectural simplification of a sensing signal processing flow is realized; on a delay Doppler domain level, aiming at an inter-Doppler interference mechanism caused by static environment clutter coupling and a fractional Doppler effect, a pilot frequency sequence matrix with a strong self-correlation main lobe and a weak cross-correlation side lobe is innovatively constructed, and accurate separation of aliasing echoes is realized by using a sharp delay-Doppler resolution characteristic of the pilot frequency sequence matrix. According to the scheme, through the cross-domain cooperation mechanism, on the premise of maintaining the communication sensing dual-mode performance, double breakthrough of signal processing architecture simplification and pilot frequency overhead optimization is achieved, and an innovative design framework is provided for a communication sensing integrated system in a mobile scene.

An apparatus (10, 110) comprising: means for transmitting, to a second apparatus (120), first information (901) indicative of a capability of the apparatus to adapt at least one of: a design of a frequency-domain spectral shaping, FDSS, filter (902) for FDSS-based orthogonal frequency division multiplexing, OFDM, transmission, or a spectral extension parameter (903) for use in FDSS-based OFDM with spectral extension transmission; means for receiving, from the second apparatus based at least in part on the transmitted first information, second information (904), wherein the second information comprises information for configuring the apparatus to operate in an operational mode (906) for generating training data for training a machine learning, ML, based FDSS filter; and means for operating in the operational mode, wherein the operation in the operational mode is based at least in part in on the second information, and wherein operating in the operational mode comprises: transmitting, using at least a first configuration of the FDSS filter design (909) or a first spectral extension parameter (910), at least a first FDSS-based OFDM transmission (908) to the second apparatus.

DFT spreading is applied to a sequence of symbols to generate a DFT-spread sequence of symbols. The DFT-spread sequence of symbols is frequency-division multiplexed with a reference signal sequence to generate a multiplexed sequence, and the DFT-spread sequence of symbols and the reference signal sequence are recoverable from demultiplexing the multiplexed sequence. Further processing, such as a transform to convert to time domain and / or spectral shaping, may be applied in some embodiments. The symbols may be modulation symbols to which data bits are mapped, in binary phase-shift keying (BPSK) modulation, pi / 2-BPSK modulation, quadrature phase-shift keying (QPSK) modulation, quadrature amplitude modulation (QAM) or offset-QAM (OQAM), for example. Embodiments may be applied in conjunction with any of different types of reference signals, such as a demodulation reference signal (DM-RS), a phase tracking reference signal (PT-RS), or a channel state information reference signal (CSI-RS), or different types of reference signal sequences.

An apparatus (10, 100) comprising: means for transmitting, to a second apparatus (120), first information (1101) indicative of a capability of the apparatus to adapt at least one of: a design of a first frequency-domain spectral shaping, FDSS, filter (1102) for FDSS-based orthogonal frequency division multiplexing, OFDM, transmission, wherein the first FDSS filter design is matched with a design of a second FDSS filter of the second apparatus, and wherein at least one of the first or second FDSS filter designs has trainable operational parameters; or a spectral extension parameter (1103) for use in FDSS-based OFDM with spectral extension transmission; means for receiving, from the second apparatus based at least in part on the transmitted first information, second information (1104), wherein the second information comprises information for configuring the apparatus to operate in an operational mode (1106) for training the operational parameters of at least one of the first or second FDSS filter designs; and means for operating in the operational mode, wherein the operation in the operational mode is based at least in part in on the second information, and wherein operating in the operational mode comprises: transmitting, using at least a first configuration of the first FDSS filter design (1109) or a first spectral extension parameter (1110), at least a first FDSS-based OFDM transmission (1108) to the second apparatus; receiving, from the second apparatus, third information (1112), for use in training the operational parameters of the first FDSS filter design, wherein the third information is based at least in part on the first FDSS-based OFDM transmission received at the second apparatus via the second FDSS filter design; and training the operational parameters of the first FDSS filter design based at least in part on: the first FDSS-based OFDM transmission, and the third information.

The present invention discloses a dispersion measurement method for a high-power laser system, which relates to the fields of optical device measurement technology and laser technology. The method is based on the spectrum shaping of ultrashort pulse lasers, and obtains laser pulses with fingerprint spectrum structure and conversion limit pulse width by designing a special spectrum response curve. According to the frequency-time mapping principle, after the laser pulse with fingerprint spectrum structure is transmitted through a dispersive medium (object to be measured), the frequency domain distribution (i.e., spectrum) of the laser pulse will be mapped to the time domain, presenting a state in which the frequency domain distribution corresponds to the time domain waveform. By measuring the information such as the spectrum and time domain waveform of the laser pulse after the dispersion component is connected, and fitting and data analysis and processing with the dispersion model of Taylor expansion, the dispersion measurement of each component in the high-power laser system, such as a stretcher, a compressor, etc., is realized. The method constructs a fingerprint spectrum with a special structure for measurement, which can not only realize the rapid and precise diagnosis of the dispersion of the high-power laser system, obtain the deconstruction of high-order dispersion, but also reduce the statistical fluctuation of the data and the uncertainty of the measurement by increasing the sampling data points, and improve the accuracy of the dispersion measurement.

Methods and apparatuses for signaling pulse shaping in a wireless communication system. A method of BS includes determining a spectral extension index (SEIndex) and a frequency domain spectral shaping type index (FDSSTypeIndex) for at least one transmission time interval (TTI) and transmitting, to a UE, the SEIndex and the FDSSTypeIndex. The method further includes receiving, from the UE, uplink (UL) data based on a spectral extension (SE) ratio associated with the SEIndex and frequency domain spectral shaping (FDSS) values. The FDSS values are associated with the FDSSTypeIndex.

An apparatus (10, 110) comprising: means for transmitting, to a second apparatus (120), first information (1301) indicative of a capability of the apparatus to adapt at least one of: a design of a frequency-domain spectral shaping, FDSS, filter (1302) for FDSS-based orthogonal frequency division multiplexing, OFDM transmission, or a spectral extension parameter (1303) for use in FDSS-based OFDM with spectral extension transmission; means for receiving, from the second apparatus based at least in part on the transmitted first information, second information (1305), wherein the second information comprises information for configuring the apparatus to operate in an operational mode (1306) in which a performance of the FDSS filter design is monitored; means for operating in the operational mode, wherein the operation in the operational mode is based at least in part in on the second information, and wherein operating in the operational mode comprises: transmitting, using at least a first configuration of the FDSS filter design (1309) or a first spectral extension parameter (13010), at least a first FDSS-based OFDM transmission (1308) to the second apparatus; receiving, from the second apparatus, third information (1312), wherein the third information is based at least in part on the at least first FDSS-based OFDM transmission received at the second apparatus; and monitoring the performance of the FDSS filter design based at least part on the third information.

A system and method are provided for spectral shaping of light from a broadband source including multiple wavelengths. The system includes a beam splitter (BS) to receive and transmit an input beam, a dispersive element to disperse the input beam into dispersed beams separated by wavelength, and optic-elements to direct the dispersed beams onto a spatial light modulator (SLM). The SLM selectively modulates the dispersed beams reflected from the SLM, and the optic elements transmit a 0th-order of the reflected light through the dispersive element, which recombines the beams to form a reflected beam directed toward the BS. The BS separates the reflected beam from the input beam and directs it to an optical output of the system. The SLM includes multiple electrostatically deflectable reflective ribbons suspended over a reflective surface of a substrate, wherein the ribbons are separated by a distance equal to a width of the ribbons.

According to one embodiment, a method performed by an apparatus of a base station can include an operation of determining a first frequency domain of a reference signal in an extended frequency domain of frequency domain spectral shaping (FDSS) based on a quality of communication of a channel between the base station and a terminal. The method can include an operation of transmitting resource allocation information about a second frequency domain used for a data signal in the extended frequency domain to the terminal, an operation of receiving an uplink signal including the reference signal and the data signal configured based on the FDSS through the extended frequency domain, an operation of performing channel estimation for the second frequency domain through the reference signal received via the first frequency domain, and an operation of acquiring the data signal according to a result of the channel estimation for the second frequency domain.

According to an aspect of the present invention an encoder for encoding an audio signal comprises an analyzer configured for deriving prediction coefficients and a residual signal from a frame of the audio signal. The encoder comprises a formant information calculator configured for calculating a speech related spectral shaping information from the prediction coefficients, a gain parameter calculator configured for calculating a gain parameter from an unvoiced residual signal and the spectral shaping information and a bitstream former configured for forming an output signal based on an information related to a voiced signal frame, the gain parameter or a quantized gain parameter and the prediction coefficients.

The present invention discloses an optical signal processing method, a control unit, an optical transmitting unit and a storage medium. The optical signal processing method includes: obtaining an OSNR value from an optical receiving unit; obtaining a spectrum shaping adjustment parameter according to the OSNR value; sending the spectrum shaping adjustment parameter to the optical transmitting unit to adjust the filtering parameter of the shaping filter of the optical transmitting unit, so that the optical transmitting unit uses the adjusted shaping filter to adjust the spectrum waveform of the optical signal. In an embodiment of the present invention, the optical transmitting unit is controlled to adjust the filtering parameter of the shaping filter according to the OSNR value from the optical receiving unit, so that the optical transmitting unit can adjust the spectrum waveform of the optical signal and improve the transmission performance of the OTN system.

A computer-implemented method, when executed by data processing hardware, causes the data processing hardware to perform various operations. These operations include receiving an audio signal from a sensor array at a unified post-filter, converting the audio signal to a short time Fourier transform (STFT) domain via a conversion function, determining a speech presence probability based on the converted audio signal, and determining a noise smoothing factor based on the speech presence probability. The operations further include estimating, via the unified post-filter, a noise power spectral density based on the noise smoothing factor, estimating, via the unified post-filter, a steering vector of the desired source, and generating, via the unified post-filter, a directivity-based mask and a coherence-based mask. Operations further include generating a residual echo spectrum estimate based on the directivity-based mask and the coherence-based mask, and setting one or more spectrum shaping factors based on the residual echo spectrum estimate.

The present invention discloses a femtosecond laser chirped pulse self-similar regenerative amplification method and device. The device includes a broadband seed source, a spectral shaping and broadening device, a self-similar regenerative amplifier, and a pulse compressor that are sequentially arranged from one side to the other side according to the optical path. The spectral shaping and broadening device includes a time-domain broadening device and a spectral shaper. The time-domain broadening device is used to broaden the seed pulse to the picosecond level or even the nanosecond level and finely regulate the pulse width. The spectral shaper is used to perform spectral shaping on the seed pulse so that the spectral intensity of the broadened seed pulse is a saddle-shaped chirped pulse with high intensity at both sides and low intensity in the center. The self-similar regenerative amplifier includes a gain crystal and a highly nonlinear crystal. After the saddle-shaped chirped pulse is injected into the self-similar regenerative amplifier, it undergoes nonlinear spectral broadening and amplification multiple times back and forth and outputs a high-energy chirped pulse to the pulse compressor.

Examples of the present disclosure relate to a method, device and apparatus for communication, and a computer-readable medium. An example of the method includes: conducting, based on a channel response between a transmitter and a receiver, spectral shaping on a first sequence at the transmitter, so as to obtain an intermediate sequence, where the spectral shaping at least partially counters the channel response; remapping the intermediate sequence, so as to obtain a second sequence, where the second sequence has less signal levels than the intermediate sequence; and transmitting the second sequence to the receiver, so as to train an equalizer of the receiver. In this way, the method can accelerate training of the equalizer without sacrificing performance of the equalizer or introducing any additional hardware cost.

A computer-implemented method when executed by data processing hardware causes the data processing hardware to perform operations. The operations include receiving, from a sensor array, an audio signal at a unified post-filter, converting, via a conversion function, the audio signal into a Short-Time Fourier Transform (STFT) domain, determining, based on the converted audio signal, a speech-presence probability, and determining, based on the speech-presence probability, a noise smoothing factor. The operations also include estimating, via the unified post-filter, a noise power spectral density based on the noise smoothing factor, estimating, via the unified post-filter, a steering vector of a desired source, and generating, via the unified post-filter, a directionality-based mask and a coherence-based mask. The operations further include generating, based on the directionality-based mask and the coherence-based mask, a residual echo spectrum estimation and setting one or more spectral shaping factors based on the residual echo spectrum estimation.

The present document relates an audio encoding and decoding system (referred to as an audio codec system). In some embodiments, a method of audio signal encoding comprises: receiving an input audio signal; transforming a sequence of samples of the input audio signal into a block of transform coefficients, the transform coefficients indicative of the spectral energy of the block; estimating a spectral envelope of the block from the transform coefficients; adjusting the transform coefficients using the spectral envelope and a spectral shaper, the spectral shaper including one or more parameters indicative of a fundamental frequency of a multi-sinusoidal signal model, where the fundamental frequency corresponds to a time domain delay; and entropy coding the adjusted transform coefficients.

A resource configuration method and device. The method comprises: a terminal device receives configuration information from a network device, wherein the configuration information is used for configuring a transmission bandwidth of a waveform for the terminal device, so that the terminal device can transmit data with the network device on the basis of the transmission bandwidth. The transmission bandwidth is determined on the basis of a sequence spreading factor, the sequence spreading factor is a preset value, and the waveform generation comprises performing, on the basis of the sequence spreading factor, sequence spreading and frequency-domain spectral shaping (FDSS) on a symbol sequence carried by the waveform. A transmission bandwidth is allocated to a terminal device by means of a sequence spreading factor, so as to ensure the communication capacity or increase the communication capacity on the basis of a given sequence spreading factor (i.e., on the basis of ensuring the OBO gain and PAPR gain).

Embodiments are disclosed for spatial noise filling in multi-channel codecs. In an embodiment, a method of regenerating background noise ambience in a multi-channel codec by generating spatial hole filling noise comprises: computing noise estimates based on a primary downmix channel generated from an input audio signal representing a spatial audio scene with background noise ambience; computing spectral shaping filter coefficients based on the noise estimates; spectrally shaping the multi-channel noise signal using the spectral shaping filter coefficients and a noise distribution, the spectral shaping resulting in a diffused, multi-channel noise signal with uncorrelated channels; spatially shaping the diffused, uncorrelated multi-channel noise signal with uncorrelated channels based on a noise ambience of the spatial audio scene; and adding the spatially and spectrally shaped multi-channel noise to a multi-channel codec output to synthesize the background noise ambience of the spatial audio scene.

A communication method, comprising: a first communication device determining first indication information used for indicating information of a first filter, wherein the first filter is used for spectral shaping; and the first communication device sending the first indication information to a second communication device, such that the second communication device can determine the first filter on the basis of the first indication information. Therefore, during channel estimation, a second communication device actually takes the factors of signals and filters into consideration, instead of identifying both the signals and the filters as equivalent channels, such that the channel estimation quality during channel estimation can be improved, and the sensing precision is improved.

The application provides a wavelength-selective infrared emitter device controlled by ultrafast laser and voltage, which comprises a first phase change material layer, a dielectric layer, a second phase change material layer, a metal reflection layer, a silicon substrate and a conductive layer from top to bottom; by means of layered superposition design of nonvolatile phase change material and volatile phase change material, surface micro-nano structure control and optical resonant cavity control are spatially separated, so that structure reconstruction and cavity length conversion bear different spectral control tasks respectively, thereby breaking through the problem that the control freedom degree of single phase change material is limited; that is to say, the application adopts ultrafast laser to perform local phase change control on the first phase change material layer, so as to realize writing or erasing of a surface periodic grating structure, and by means of applying voltage, the second phase change material layer is subjected to phase transition, so as to adjust the equivalent optical cavity length of the Fabry-Perot cavity, and finally the spectral shaping ability and control flexibility are improved, and wavelength-selective control can be realized.

It is described a transmitter device (100) and a method for transmitting an analog signal (251, 261) via an electric cable (192). The transmitter device (100) comprises (a) a signal generation circuit (210) for generating a digital transmit signal (211) comprising a sequence of transmit symbols; (b) a filter circuit (230) for spectrally shaping the generated digital transmit signal (211, 221) and for outputting a filtered digital transmit signal (231); (c) a switching unit (240) comprising (c1) a first input terminal (242) for receiving the filtered digital transmit signal (231), (c2) a second input terminal (244) for receiving another digital transmit signal (297), (c3) an output terminal (246) for outputting a digital transmit output signal (241), wherein the digital transmit output signal (241) is based on, depending on a switching state of the switching unit (240), the filtered digital transmit signal (231) or the another digital transmit signal (297), and (c4) a control terminal (248) for receiving a control signal (285) from a control circuit (280), the control signal (285) being indicative for the switching state. The transmitter device (100) further comprises the control circuit (280); and a digital to analog converter (250) for receiving the digital transmit output signal (241) and for converting the received digital transmit output signal (241) to the analog signal (251, 261).

Methods, systems, and devices for wireless communication are described herein. Techniques described herein provide for placing single carrier waveform formation into an Orthogonal Frequency Division Multiple Access (OFDMA) framework. To be suitable for placement in a cyclic prefix OFDM (CP-OFDM) grid, a frequency domain fast Fourier transform (FFT) may be applied to a single carrier waveform, bandwidth extension and spectral shaping may be applied to the output of the FFT, and inverse FFT (IFFT) processing may be applied to the output of the bandwidth extension and spectral shaping. The output of the IFFT may then be represented in an OFDM compatible manner.

Methods, systems, and devices for wireless communications are described. The techniques described herein provide for formulating a single-carrier waveform into an Orthogonal Frequency Division Multiple Access (OFDMA) framework. To fit a Cyclic Prefix OFDM (CP-OFDM) grid, a frequency-domain Fast Fourier Transform (FFT) may be applied to the single-carrier waveform, bandwidth expansion and spectral shaping may be applied to the output of the FFT, and inverse FFT (IFFT) processing may be applied to the output of the bandwidth expansion and spectral shaping. The output of the IFFT may then be represented in an OFDM-compatible manner.

An apparatus (10, 110) comprising: means for transmitting, to a second apparatus (120), first information (701) indicative of a capability of the apparatus to adapt at least one of: a design of a frequency-domain spectral shaping, FDSS, filter (702) for FDSS-based orthogonal frequency division multiplexing, OFDM, transmission, or a spectral extension parameter (703) for use in FDSS-based OFDM with spectral extension transmission; means for receiving, from the second apparatus based at least in part on the transmitted first information, second information (704), wherein the second information comprises information for configuring the apparatus to operate in an operational mode (706) in which training data for training a machine learning, ML, based FDSS filter is generated; means for operating in the operational mode, wherein the operation in the operational mode is based at least in part in on the second information, and wherein operating in the operational mode comprises: transmitting, using at least a first configuration of the FDSS filter design (709) or a first spectral extension parameter (710), at least a first FDSS-based OFDM transmission (708) to the second apparatus; receiving, from the second apparatus, third information (712), wherein the third information is based at least in part on the at least first FDSS- based OFDM transmission received at the second apparatus; and generating training data based at least in part on: the at least a first configuration of the FDSS filter design or the first spectral extension parameter; and the third information.

A computer-implemented procedure, when executed by data processing hardware, causes the data processing hardware to perform operations. These operations include receiving an audio signal from a sensor array at a unified post-filter, converting the audio signal into a short-time Fourier transform (STFT) domain using a conversion function, determining a speech presence probability based on the converted audio signal, and determining a noise smoothing factor based on the speech presence probability. The operations also include estimating a spectral noise power density based on the noise smoothing factor across the unified post-filter, estimating a control vector of a desired source across the unified post-filter, and generating a direction-based mask and a coherence-based mask across the unified post-filter.The operations also include generating a residual echo spectrum estimate based on the direction-based mask and the coherence-based mask, and setting one or more spectral shaping factors based on the residual echo spectrum estimate.

An erbium fiber laser produces a beam of ultrashort laser pulses having a center wavelength greater than 780 nanometers, an average power greater than 0.5 watt, and a spectral bandwidth compressible to a pulse duration of less than 200 femtoseconds. The laser includes a fiber preamplifier that is energized by a counter-propagating pump beam, has relatively low population inversion in a relatively long optical gain fiber, and provides a spectrally-shaped beam for further amplification. Wavelength dependent gain and absorption within the optical gain fiber enhances longer wavelengths relative to shorter wavelengths in the spectrally-shaped beam. The spectral shaping is sufficient to overcome gain narrowing and gain shifting in a subsequent high-gain fiber amplifier.

A Reconfigurable Optical Add / Drop Multiplexer (ROADM) node architecture is disclosed that supports wide-spectrum channel operation. The ROADM includes a plurality of degrees, each degree comprising a Wavelength Selective Switch (WSS) configured to define variable-width spectral slices and perform spectral shaping or equalization. A central fiber / space switch interconnects slice ports of the WSSs and provides programmable partial-mesh connectivity. Local add / drop is achieved through direct connection of optical modems, including Full-Spectrum-Transponders (FSTs) that integrate multiple modems and internal multiplexing to provide wide-spectrum outputs spanning all or part of an amplified band. The fiber / space switch treats the FST as an add / drop degree, simplifying operations by eliminating intervening multiplexers and reducing external fiber connections. This architecture enables efficient end-to-end transport of wide spectral slices, reduces insertion loss, and allows scalable, cost-effective deployment of high-capacity ROADM nodes using existing optical components.

The present disclosure provides communication apparatuses and communication methods for integrating frequency domain spectral shaping (FDSS) with spectrum extension and tone reservation. The communication apparatuses include a communication apparatus comprising: circuitry, which in operation: determines one or more frequency components for a spectrum-10 extension (SE) part and one or more other frequency components for a non-SE part of a signal based on control information relating to the SE part and the non-SE part; generates a compensating signal based on the one or more frequency components of the SE part; and generates a reduced peak signal based on the compensating signal; and a transmitter, which in operation, transmits the 15 reduced peak signal.

An apparatus (UE) 110: transmits, to a second apparatus (gNB) 120, first information 1501 indicating capability of the apparatus to adapt at least one of: a first frequency-domain spectral shaping, F