47results about "Equalisers" patented technology

The invention discloses an OFDM (Orthogonal Frequency Division Multiplexing) signal time-frequency collaborative equalization distortion suppression method, and belongs to the field of wireless communication. According to the invention, the problems of high complexity and poor transmission reliability of the existing short cyclic prefix method are solved. According to the invention, an OFDM system based on time domain oversampling and frequency domain interpolation equalization is adopted at a receiving end, and the oversampling algorithm can enhance the power of useful signals by properly broadening an equalization frequency band, so that the equalization effect is enhanced; according to the frequency domain interpolation equalization algorithm, weighted interpolation processing is carried out on frequency domain receiving signals, so that spectrum details can be better captured, and compensation and correction of an energy migration phenomenon generated by spectral lines in a frequency band due to a channel effect are realized. Through time-frequency cooperative processing at a receiving end, interference can be efficiently suppressed, stable and reliable demodulation precision and communication quality can be ensured, frequency spectrum resource loss caused by additional extension of a cyclic prefix can be avoided, and the frequency spectrum utilization efficiency of the system is further remarkably improved. The method can be applied to the field of wireless communication.

To provide a method for facilitating effective and efficient soft mounting of an examination order of a different type in an examination system, and provide a signal processing examination system.SOLUTION: A signal processing examination method comprises the steps of: selecting a signal processing mode among a header conclusion mode, a contraction header training mode, and a contraction header mode; executing signal processing information determination processing in accordance with a selection result of the signal processing mode; and executing modulation / demodulation related processing in accordance with a result of the signal processing information determination processing. In the contraction header mode, processing is executed to a communication signal. Header information cannot be easily used at first in the communication signal itself. Demodulation parameter information is advantageously derived / developed / inserted from the other information in the communication signal.SELECTED DRAWING: Figure 8

The present application discloses a dynamic power consumption management system, comprising: an equalization algorithm circuit, a carrier recovery algorithm circuit, and an IQ imbalance algorithm circuit; an equalization algorithm coefficient update circuit connected to an output end of the carrier recovery algorithm circuit and configured to provide equalization algorithm update coefficients to the equalization algorithm circuit; a carrier recovery frequency offset and phase noise calculation circuit connected to an output end of the equalization algorithm circuit and configured to provide carrier recovery frequency offset and phase noise coefficients to the carrier recovery algorithm circuit; an IQ imbalance algorithm coefficient update circuit connected to an output end of the IQ imbalance algorithm circuit and configured to provide IQ imbalance algorithm coefficients to the IQ imbalance algorithm circuit; a signal-to-noise ratio reporting circuit connected to an output end of the IQ imbalance algorithm circuit and configured to acquire a signal-to-noise ratio of the entire system; and a management circuit configured to determine the equalization algorithm update coefficients, the carrier recovery frequency offset and phase noise coefficients, and the IQ imbalance algorithm coefficients based on the signal-to-noise ratio. The present application can reduce the power consumption of chips.

According to an embodiment, a method of an electronic device for receiving a signal in an OFDM system may comprise an operation of determining a common channel estimation value on the basis of demodulation reference signals belonging to a resource block including a plurality of OFDM symbols adjacent in the time domain and a plurality of subcarriers adjacent in the frequency domain. The method of the electronic device may comprise an operation of determining a port reduction filter for reducing the dimension of a reception signal on the basis of the common channel estimation value. The method of the electronic device may comprise an operation of determining a covariance matrix on the basis of a reception signal having passed through the port reduction filter. The method of the electronic device may comprise an operation of performing channel equalization on the basis of the port reduction filter and the covariance matrix.

According to an embodiment, a method performed by means of an electronic device comprises an operation of obtaining a signal on a plurality of resource elements (REs). The method comprises the operations of: selecting reference REs from the plurality of REs on the basis of the time interval between symbols and the frequency interval between the symbols; performing channel estimation on the basis of the reference REs; obtaining, on the basis of a result of the channel estimation, a plurality of first weights corresponding to the reference REs; obtaining, on the basis of the plurality of first weights, a plurality of second weights corresponding to other REs that are distinct from the reference REs from among the plurality of REs; and obtaining, on the basis of the plurality of first weights and the plurality of second weights, information corresponding to the signal.

A wireless terminal (1) is configured to, (a) when transmitting uplink control information in a first subframe of a radio frame, determine the number of coded symbols (Q') for the uplink control information by a first calculation method, and (b) when transmitting the uplink control information in a second subframe of the radio frame, determine the number of the coded symbols (Q') for the uplink control information by a second calculation method different from the first calculation method. This can contribute, for example, to adjusting redundancy of coded uplink control information (UCI) bits on a per-subframe basis.

The present invention relates to a signal design technique resistant to phase distortion and may provide a method of a transmitter, the aspect comprising the steps of: modulating a sequence of source bits to be transmitted to a receiver to generate a first block of symbols; inserting at least one pilot into the first symbol block to generate a second symbol block; performing cumulative linear coding on the second symbol block to generate a third symbol block; performing real phase conversion on the third symbol block to generate a first signal converted to a phase value; adding a cyclic prefix (CP) to the first signal to generate a second signal; and wirelessly transmitting the second signal to the receiver.

The invention discloses a frequency domain super-resolution reconstruction OFDM (Orthogonal Frequency Division Multiplexing) waveform distortion suppression method, and belongs to the field of wireless communication. The method solves the problems that an existing method is high in complexity, sensitive to channel conditions and poor in error rate performance. The method comprises the following steps: constructing an interpolation matrix at a receiving end, and carrying out weighted interpolation on a frequency domain receiving signal by utilizing adjacent spectral line weighting to generate an interpolated frequency domain signal; the method comprises the following steps of: deducing to obtain a time domain equivalent relation of interpolation processing of a transmitting end and a receiving end by combining the logic of performing frequency domain zero insertion on an original frequency domain signal by a transmitting end, further jointly estimating an interpolated channel, and designing an equalizer according to a minimum mean square error criterion to perform equalization processing on the interpolated frequency domain signal to complete data recovery. According to the method, the problem of inter-symbol interference caused by insufficient CP of a common OFDM system with insufficient cyclic prefixes is solved, inter-symbol interference and inter-subcarrier interference caused by insufficient cyclic prefixes can be effectively suppressed, and accurate demodulation data can be obtained. The method can be applied to the field of wireless communication.

Methods, systems, and devices for wireless communications are described. The described techniques may provide for an adaptive digital post-distortion (DPoD) procedure and reporting of modulation and coding scheme (MCS) indices for communications between a user equipment (UE) and a network entity. The UE may select a kernel from a set of kernels indicated by the network entity for a DPoD procedure based on a target error vector magnitude (EVM). Additionally, or alternatively, the UE may determine a limitation for an MCS index for the network entity to use in communications with the UE based on a power limitation of the UE and an EVM associated with the MCS. The network entity and the UE may accordingly communicate using the MCS limitation requested by the UE and the determined DPoD kernel.

This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for equalization domain selection at a wireless device. A wireless device may be configured to support a selection between time domain equalization and frequency domain equalization for receiving RF signals, which may be performed in accordance with detected channel conditions. For example, if a wireless device detects conditions associated with a relatively dispersive channel, the wireless device may select a frequency domain equalization and, if the wireless device detects conditions associated with a relatively flat channel, the wireless device may select a time domain equalization. In some implementations, performing a time domain equalization may include changing a sampling rate into a symbol rate, such as performing a resampling using a Farrow resampler. Such techniques may include a wireless device selecting an equalization scheme associated with a relatively lowest power consumption for detected channel conditions.

This invention provides a signal processing test system and a signal processing test method that facilitate the efficient, effective, and flexible implementation of different types of test procedures in a test system. [Solution] The signal processing test method comprises a step 810 of selecting a signal processing mode from a header inclusion mode, a reduced header training mode, and a reduced header mode; a step 820 of executing a signal processing information determination process according to the result of the step of selecting the signal processing mode; and a step 830 of executing modulation / demodulation-related processing according to the result of the signal processing information determination process. In the reduced header mode, processing is performed on the communication signal. Header information is not initially readily available in the communication signal itself, and demodulation parameter information is advantageously derived / developed / extrapolated from other information in the communication signal.

The invention discloses an MMSE-FED (Molecular Code Division Multiple Access) and decision feedback interference removing method and device, and the method comprises the steps: carrying out the fast Fourier transform of an original observation value, obtaining a frequency domain observation matrix, carrying out the sorting according to the receiving power or distance of a nanometer transmitter at a fusion center, and obtaining a frequency domain observation matrix; the method comprises the following steps: taking a first nanometer transmitter as the current most reliable, taking an initial frequency domain observation matrix as a basis, obtaining a judgment variable through MMSE-FED, IFFT and de-spreading operation, then obtaining a hard judgment result through a judgment function as a bit sequence of a first nanometer transmitter, reconstructing signal contribution according to the bit sequence, obtaining an updated frequency domain receiving signal, and obtaining a second nanometer transmitter; for the kth nanometer transmitter after sorting, based on the updated frequency domain receiving signal, repeating the operation to detect the bit sequence, and reconstructing the signal again for interference elimination; and finally, detecting the bit sequence of the Kth transmitter based on the signal updated for the (K-1) th time through loop iteration.

In some embodiments, CTLE circuits are provided with shunt RL components to facilitate substantially consistent output transmitter resistance over an operational frequency spectrum.

This communication device includes a baseband signal processing unit, an in-phase signal processing unit and a quadrature signal processing unit that modulate a data signal input from the baseband signal processing unit, and a balanced antenna provided with a first port and a second port. The communication device is provided with a first path that connects the baseband signal processing unit and the first port via the in-phase signal processing unit, and a second path that connects the baseband signal processing unit and the second port via the quadrature signal processing unit. The first port and the second port have opposite polarities. The communication device further includes a phase notification unit that generates a notification signal, in order to output the notification signal indicating phase information corresponding to a phase difference between an in-phase signal to be output via the first path and a quadrature signal to be output via the second path.

An adaptive digital pre-distortion device includes a legacy digital pre-distortion (DPD) device, one or more processors including processing circuitry, and a memory storing instructions. The instructions, when executed by the one or more processors individually or collectively, cause the adaptive DPD device to receive a plurality of system parameters, estimate, using a neural network, one or more coefficients of the legacy DPD device, and apply the one or more coefficients to the legacy DPD device. The neural network is configured to generate, as outputs, the one or more coefficients based on the plurality of system parameters.

Systems, devices, and methods relating to hybrid basis function, neural network-based digital predistortion (DPD) are provided. An exemplary apparatus for a radio frequency (RF) transceiver includes a digital predistortion (DPD) actuator for receiving an input signal associated with a nonlinear component of the RF transceiver and outputting a predistorted signal. The DPD actuator includes a basis function-based actuator for performing a first DPD operation using a set of basis functions associated with a first nonlinear characteristic of the nonlinear component. The DPD actuator further includes a neural network-based actuator for performing a second DPD operation using a first neural network associated with a second nonlinear characteristic of the nonlinear component. The predistorted signal is based on a first output signal of the basis function-based actuator and a second output signal of the neural network-based actuator.

A method and apparatus for processing a signal to generate equalizer codes, which are used to control equalization of the signal, that comprises processing the signal to identify the eyes of the signal, and for each eye, calculating an eye height and calculating a noise value. For each eye, squaring the eye height to generate an eye height product and dividing the eye height product by the noise value to generate a Q2 value. Using the calculated Q2 values optimizing, through adaptation, the equalizer codes. Calculating the noise values may include calculating an IS I value for each band of the signal and then calculating the eye height for each eye as the difference between the adjacent upper average value and the adjacent lower average value. Then, for each eye, calculating a noise value by summing the IS I value for the band above the eye and the band below the eye.

Embodiments for a method and apparatus are described for non-linear noise cancelation and in phase quadrature (I / Q) modulation error correction. The embodiments include receiving a signal, the signal including a plurality of data segments. A first data segment in the received signal is demodulated and decoded to produce a recovered segment of a bitstream. At least one correction factor is applied to a first demodulation support element and a second demodulation support element during demodulation of a second data segment in the received signal. The correction factor is determined based on the received first data segment and a representation of the first data segment reconstructed from the recovered segment of the bitstream.

An adaptive digital pre-distortion device includes a legacy digital pre-distortion (DPD) device, one or more processors including processing circuitry, and a memory storing instructions. The instructions, when executed by the one or more processors individually or collectively, cause the adaptive DPD device to receive a plurality of system parameters, estimate, using a neural network, one or more coefficients of the legacy DPD device, and apply the one or more coefficients to the legacy DPD device. The neural network is configured to generate, as outputs, the one or more coefficients based on the plurality of system parameters.

A system and computer-implemented method using a physical information neural network for data communication are provided. At a transmitter, the method is configured to obtain source data to be transmitted to encode the source data into code words based on a forward error correction code, map the code words to amplitude symbols, modify the mapped amplitude symbols into pre-equalized symbols including pre-distorted channel impairment symbols based on a predetermined physical model, and transmit the digital data of the pre-equalized symbols as channel data over a channel. At a receiver, the method is configured to receive and demodulate channel data from a channel to generate initial estimates of bits of the received channel data, mitigate channel noise and waveform distortion in the channel data based on the initial estimates, convert the channel data consisting of shaped non-uniform symbols as a non-uniform data sequence into an unshaped bit sequence, decode the unshaped bit sequence, correct residual errors in the converted channel data, and store the corrected channel data in a data sink.

An optimized pulse shaping clock data recovery system is provided that includes a slicer configured to receive a signal and provide an initial set of tentative decisions to a decision feedforward equalizer, where the decision feedforward equalizer provides a fully equalized output signal. The slicer may be incorporated as part of decision feedback equalizer to provide better quality tentative decisions. The clock data recovery system also receives the first output signal that is partially equalized in such a way as to optimally shape it for a clock to sample it at an ideal location by providing an adjustment signal to the analog to digital controller.

The present application discloses an adaptive equalization method and apparatus for a probabilistic shaping system, and a readable storage medium. The adaptive equalization method may include: determining a tap length of a filter, and setting an initial coefficient of an equalizer; performing butterfly filtering on two polarized input signals according to the coefficient of the equalizer to obtain two polarized output signals; determining an error signal according to the two polarized output signals, wherein the error signal is a sum of a first error which is a minimum value of differences between a target convergence radius and squares of modulus of the output signals, and a second error which is a difference between an average value of squares of modulus of a plurality of output signals and a target average power; and adjusting the coefficient of the equalizer according to the error signal.

Embodiments of the present disclosure relate to a base station (BS) and method for communication in a communication network. The method comprising signaling at least one antenna port number from multiple antenna port numbers to a UE. Also, the method comprises receiving a data and a reference signal (RS) corresponding to the UE. The data and the RS are received on one or more receive antennas of the BS, wherein the RS comprises occupied RS subcarriers and null subcarriers. A location of occupied RS subcarriers and null subcarrier positions are selected according to signaled antenna port. Next, channel parameters are estimated using the occupied subcarriers associated with the received RS, and interference plus noise parameters using the null subcarriers. Thereafter, equalizing the received data on the receive antennas using the measured channel parameters and the interference plus noise parameters for interference rejection and data detection.

This disclosure aims to suppress abrupt deterioration of characteristics such as the error rate of received bits, while suppressing an increase in the overall system delay of the receiving device and the amount of computation per demodulated symbol when switching the modulation method from a fixed-envelope modulation signal to a non-fixed-envelope modulation signal in order to compensate for the nonlinear distortion of the modulated signal. [Solution] In this disclosure, the level shifter 3 provided in the receiving device R shifts the constant envelope modulated signal to multiple envelope levels and adjusts the frequency of the level shift to multiple envelope levels. Then, when the receiving device R switches between receiving a constant envelope modulated signal and a non-constant envelope modulated signal, the equalizer 4 provided in the receiving device R can adjust the weight coefficients of the equalization filter to be equal, thereby suppressing abrupt deterioration of characteristics such as the error rate of the received bits.

The invention discloses an OTFS communication channel equalization method, which comprises the following steps of: firstly, converting an original bit stream into complex field modulation symbols through symbol mapping, and arranging the complex field modulation symbols to a time delay-Doppler grid to obtain a time delay-Doppler domain signal; secondly, mapping the time delay-Doppler domain signal to a time-frequency domain through inverse symplectic Fourier transform to obtain a time-frequency domain signal; converting the time-frequency domain signal into a time domain signal through Hisenberg transform, adding a cyclic prefix, and sending the time domain signal to a receiving end; a receiving end receives the time domain signal and removes the cyclic prefix, and the time domain signal is mapped back to the time delay-Doppler domain through Wigner transform and Sextile Fourier transform; performing low-complexity BC-MMSE pre-equalization on a received signal by using the block cycle characteristic of a time delay-Doppler domain equivalent channel matrix to obtain a symbol initial estimation value; and performing MRC iterative equalization processing on the obtained initial estimation value of the symbol, and finally outputting a demodulation signal, thereby effectively reducing the calculation complexity while ensuring the communication performance.

A noise detection device includes: a DFT executor that performs a DFT on an input signal and outputs a transform result; a carrier wave detector that detects a carrier wave frequency bin in the transform result; a frequency corrector that performs a correction to reduce a difference between a center frequency of the carrier wave frequency bin and a frequency of the carrier wave; a phase calculator that calculates a phase of each signal component in a corrected transform result; a phase inversion unit that inverts an order of the phase of each signal component with respect to a center frequency of the carrier wave frequency bin in the corrected transform result; and an asymmetric component detector that detects, as noise, a signal component whose phase is asymmetric with respect to the carrier wave frequency bin in the corrected transform result.

The invention discloses an orthogonal time-frequency-space transceiver suitable for a satellite-ground scene, and relates to the technical field of satellite communication, in particular to the orthogonal time-frequency-space transceiver suitable for the satellite-ground scene. The invention aims to solve the problem that the bit error rate is too high. The method comprises the following steps of: 1, enabling transmission data to sequentially pass through a convolutional coding module, an interleaving module, a scrambling module, a QAM (Quadrature Amplitude Modulation) module, an OTFS (Over the Top File System) module and a CP (Content Program) adding module, and inserting DMRS (Demodulation Reference Signal) into output data of the 2, framing a data symbol, an information symbol and a leader sequence; 3, the framed data sequentially pass through a DAC and an antenna to enter a time-frequency double-selection channel, an antenna on the other FPGA receives a signal, then the signal passes through an ADC to reach a frame synchronization module, output data are sequentially input into CFO frequency offset estimation and correction, symbol synchronization, CP removal, FFT, channel estimation and equalization, inverse two-dimensional Fourier transform, information symbol solution, QAM demodulation, descrambling, de-interleaving and de-convolution coding modules, and then the output data are sent to a frame synchronization module. And the received 01 sequence is obtained.

A method and a device for V2X communication channel estimation are disclosed. The V2X communication channel estimation according to an embodiment of the present disclosure may include calculating a first channel estimation value in a time-axis forward direction from a first midamble and a second channel estimation value in a time-axis backward direction from a second midamble located after the first midamble, based on a data pilot aided (DPA) channel estimation algorithm that uses a channel estimation value of a previous OFDM symbol to iteratively update a channel estimation value, and estimating, based on the first channel estimation value and the second channel estimation value, a final channel value of a specific OFDM symbol located between the first midamble and the second midamble.

A receiver to generate a first vector of a first sequence of a portion of symbols of a signal. The receiver further generates a second vector of a second sequence of the portion of symbols, wherein the second sequence comprises a flipped version of the first sequence. Based at least in part on the first vector and the second vector, a decision including a sequence of one or more bits that represent at least a portion of the signal and a confidence level corresponding to the decision are generated.

A receiver circuit includes an equalizer configured to process a received signal; a first offset circuit configured to apply a first offset voltage to the processed signal, the first offset voltage having a first polarity; a second offset circuit configured to apply a second offset voltage to the processed signal, the second offset voltage having a second polarity opposite to the first polarity; a first amplification circuit configured to amplify a first output signal provided by the first offset circuit; a second amplification circuit configured to amplify a second output signal provided by the second offset circuit; and a third amplification circuit configured to amplify the processed signal.