133results about "Equalisers" patented technology

Accordingly, there are disclosed herein receivers and receiving methods that provide a graceful transition from PAM2 to PAM4 signaling. One illustrative method includes: negotiating a link speed having PAM4 signaling; performing adaption of at least one gain or filter coefficient during PAM2 signaling; switching to PAM4 detection before receiving PAM4 signaling; disabling said adaptation before said switching to PAM4 detection; detecting PAM4 signaling using at least one statistic of detected PAM4 symbols; and enabling said adaptation after PAM4 signaling is detected. Another illustrative method includes: negotiating a link speed having PAM4 signaling; adapting at least one of gain and filter coefficients during PAM2 signaling; monitoring for a change in at least one signal characteristic while performing PAM2 detection; and transitioning to PAM4 detection after detecting said change.

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.

The invention discloses a Turbo equalization-based single-carrier underwater acoustic communication Doppler compensation method. The Turbo equalization-based single-carrier underwater acoustic communication Doppler compensation method is combined with Turbo equalization to jointly design Doppler compensation, equalization, decoding and other processing of an underwater acoustic communication receiving end. Doppler invariance of front and back synchronous sequence signals of each frame of data segment is utilized to estimate a Doppler factor initial value, a Doppler factor candidate set is constructed by utilizing the Doppler factor initial value, the Doppler compensation effect is judged according to the size of an extrinsic information absolute value of a decoder, the optimal factor and soft symbol are selected to perform next iteration, and a Doppler compensation result is obtained. Therefore, a combined Turbo equilibrium iteration structure is formed. Compared with a traditional Doppler estimation compensation method, the method can cope with the influence of multipath Doppler in shallow sea mobile underwater acoustic communication, reduces Doppler factor estimation deviation caused by Doppler inconsistency of each path, improves the resolution of the estimated Doppler factor, and remarkably improves the decoding performance.

The invention discloses a buoy satellite communication system channel estimation method and system in a marine environment, and the method comprises the steps: carrying out the preliminary channel estimation at a receiving end through a least square algorithm, and then achieving the fine optimization through an ARCENet model based on an attention mechanism and a residual network, the residual structure improves the training stability; and the interpolation layer adopts a generative adversarial network to realize high-precision response reconstruction. The method has the advantages that the calculation load is reduced through the lightweight network design, and the dynamic characteristics of the channel are captured through nonlinear mapping; the sparse pilot frequency configuration is kept to save spectrum resources, and the robustness under the condition of low signal-to-noise ratio is remarkably improved. And finally, high-precision recovery of channel response under a complex sea condition is realized, and the reliability of a buoy satellite communication link is effectively guaranteed.

A digital filter (6) performs polarization variation compensation for data of at least two polarizations in which a plurality of known signals are inserted at predetermined positions in each frame by means of a filter in which a tap coefficient is set. Before a frame synchronization unit (4a) generates a frame signal from an output signal of a digital filter, a tap coefficient update circuit (7) updates the tap coefficient such that the difference between the amplitude value of the data and the amplitude value that the data should take is small. After a frame signal is generated, a tap coefficient updating circuit (7) receives the frame signal in a feedback manner, detects a known signal from the data on the basis of the frame signal, and updates the tap coefficient such that the difference between the detected known signal and the true value of the known signal becomes small.

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

A receiving system includes one or more subarrays, a phase rotation unit, an equalization unit, and a calculation unit. The subarray includes a set of a plurality of elements having a strong correlation in a Doppler frequency transition. The phase rotation unit performs, on a reception signal received by each element of the subarray, phase rotation processing of a phase rotation amount calculated for the subarray to which the element that has received the reception signal belongs. The equalization unit performs equalization processing on the reception signal subjected to the phase rotation processing. The calculation unit averages phase amounts of the signals received by the elements belonging to the subarray for each subarray, and calculates the phase rotation amount for performing phase compensation using the averaged phase amount.

A signaling system includes a pre-emphasizing transmitter and an equalizing receiver coupled to one another via a high-speed signal path. The receiver measures the quality of data conveyed from the transmitter. A controller uses this information and other information to adaptively establish appropriate transmit pre-emphasis and receive equalization settings, e.g. to select the lowest power setting for which the signaling system provides some minimum communication bandwidth without exceeding a desired bit-error rate.

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.

Methods, systems, and devices for wireless communications are described. A transmitting device (e.g., a user equipment (UE) or base station) may reduce a peak to average power ratio (PAPR) by clipping signals transmitted to a receiving device according to a clipping level. The receiving device may receive, from the transmitting device, an indication of the clipping level associated with a reference signal. The receiving device may receive the reference signal and identify distortions based on the clipping level. The receiving device may iteratively reconstruct peaks of the clipped reference signal until the receiving device is able to obtain accurate pilot symbols for use in channel estimation. The techniques described herein may enable receiving devices to improve efficiency and reliability of communications by improving channel estimation, which may increase the probability of successfully decoding transmitted information.

This invention discloses a pre-equalization compensation method for a terminal in a TDD-OFDM direct conversion system with known transmitter IQI and nonlinear parameters. The method includes: the base station cyclically sending P different training sequences to the terminal; the terminal using a sliding window least squares-based channel state information tracking algorithm to track and estimate the channel state information, where δ is a threshold representing the correlation of the channel within adjacent symbol periods; and pre-equalization compensation performed directly at the terminal. Using the pre-equalization compensation algorithm, a modified data sequence can be obtained and sent to the base station. This invention considers three factors in wireless communication systems: I-path and Q-path imbalance caused by the non-ideal nature of analog components in RF transceivers, power amplifier nonlinearity, and multipath channels. It enables distributed processing within the cell, effectively reducing the demodulation burden on the base station and has wider applicability than traditional compensation methods.

A radio communication method includes: by a radio terminal device, generating position indicating signals that are different between blocks of radio resources each of which is an allocation unit of data; mapping the position indicating signals generated and transmission data to the blocks; and transmitting a signal including the blocks; by a base station device, receiving the signal including the blocks of the radio resources; evaluating continuity of the blocks, based on the position indicating signals mapped to the blocks; and demodulating data mapped to the blocks for each radio terminal device, based on an evaluation result.

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.

A receiver circuit includes an equalizer configured to generate an equalized signal by equalizing an input data signal transmitted through a communication channel based on an equalization coefficient, a clock data recovery circuit configured to generate a data clock signal and an edge clock signal based on the equalized signal, generate a data sample signal including a plurality of data bits by sampling the equalized signal in synchronization with the data clock signal, and generate an edge sample signal including a plurality of edge bits by sampling the equalized signal in synchronization with the edge clock signal, and an equalization control circuit configured to control the equalization coefficient by comparing the plurality of data bits and the plurality of edge bits.

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.

Proposed is a high-speed communication device based on a duobinary signal. The device may include an output circuit configured to output a duobinary signal. The device may also include a first compensation circuit configured to apply a first equalization (EQ) for amplifying the duobinary signal to a voltage to be transitioned during voltage transition of the duobinary signal. The device may further include a second compensation circuit configured to apply a second EQ for saturating the duobinary signal to a predetermined voltage after the first EQ is applied.

A method may include testing, at a receiver, a full equalizer to determine a performance parameter. The method may include setting, at a receiver, a target performance parameter based on the performance parameter. The method may include performing, at the receiver, a first equalization operation based on the target performance parameter. The method may include setting, at the receiver, a deferred decision region based on the target performance parameter and the first equalization operation. The method may include performing, at the receiver, a second equalization operation based on the target performance parameter.

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.

The tap coefficient control circuit (12) sets the tap coefficient updated by the second tap coefficient updater (11) as the initial value of the convergence action of the tap coefficient of the first digital filter (13) updated by the first tap coefficient updater (14), arranges the tap coefficients set as the initial value in descending order according to the degree of contribution to the convergence action of the first tap coefficient updater (14), judges the tap coefficients above the upper specified number as valid, judges the tap coefficients below the specified number as invalid, sets the tap coefficients of the first digital filter (13) corresponding to the tap coefficients judged to be invalid to zero and does not use them in the calculation of the first tap coefficient updater (14) until the next judgment result comes out.

Data equalization system, featuring: a data clock input configured to receive a clock signal; an input node which is to be operated in such a way that it receives a data signal of transmission symbols which change their state synchronously with the clock signal; a first branch which is connected to the input node; and a second branch configured to receive a modification of the data signal, wherein at least one of a weighting of the first branch and a weighting of the second branch is modulated by a dynamic control parameter that repeats synchronously with each transmission symbol.

Methods, systems, and devices for wireless communication are described. The described techniques may provide an adaptive digital post-distortion (DPoD) process 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 for the DPoD process from a set of kernels indicated by the network entity based on a target error vector magnitude (EVM). Additionally or alternatively, the UE may determine a limit for an MCS index for use by the network entity in communication with the UE based on a power limit of the UE and an EVM associated with the MCS. The network entity and the UE may communicate accordingly using the MCS restriction requested by the UE and the determined DPoD kernel.

An apparatus is disclosed that implements interference and / or clutter cancellation using cross-channel equalization. In example aspects, the apparatus includes a wireless transceiver configured to be connected to multiple feed ports. The wireless transceiver is also configured to transmit an electromagnetic signal using a first feed port of the multiple feed ports. A modulated spur is generated based on the transmission of the electromagnetic signal. The wireless transceiver is additionally configured to receive two versions of a receive signal respectively via two feed ports of the multiple feed ports. The receive signal comprises the modulated spur and a mutual-coupling component associated with the transmission of the electromagnetic signal. The wireless transceiver is further configured to generate a filtered signal by attenuating the mutual-coupling component and the modulated spur within one of the two versions of the receive signal using cross-channel equalization.

To replace existing information processing devices in a redundancy system with new information processing devices without requiring any downtime.SOLUTION: In an information processing device 10, a communication control unit 11 performs communication using a first communication method and communication using a second communication method that is faster than the first communication method. An equalizing unit 13b performs equalization processing using the first communication method with respect to a first information processing device in a redundancy system in which the first information processing device and a second information processing device are in redundant configuration using the first communication method. After the equalization processing is completed by the equalizing unit 13b, an equalizing unit 13c performs equalization operation using the second communication method with respect to a third information processing device 10, and forms a redundancy system in which the information processing device 10 and the third information processing device 10 are used.SELECTED DRAWING: Figure 2

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.

The present disclosure provides a pre-equalization compensation method and device for a link, a storage medium and an electronic device. The method includes: in response to that an Active Antenna Unit (AAU) is powered on, parsing a prestored off-line compensation table to obtain first non-flatness equalization coefficients of an RF link with a plurality of sub-carriers and second non-flatness equalization coefficients of a wave control link with the plurality of sub-carriers, with each one of the plurality of sub-carriers corresponding to one of the first non-flatness equalization coefficients and one of the second non-flatness equalization coefficients; combining the first non-flatness equalization coefficients of the plurality of sub-carriers and the second non-flatness equalization coefficients of the plurality of sub-carriers to obtain a combined carrier non-flatness coefficient; and performing equalization compensation on the link according to the combined carrier non-flatness coefficient.

At least some aspects of the present disclosure provide for a method (500). In at least one examples, the method includes applying first equalization to a received data signal to generate an equalizer signal (510) and comparing the equalized signal to each of a plurality of reference voltages for a predetermined period of time per respective reference voltage to generate a comparison result (520). The method further includes determining a plurality of counts with each count of the plurality of counts uniquely corresponding to a number of rising edges in the comparison result for each of the plurality of reference voltages (525). The method further includes comparing at least one of the plurality of counts to at least another of the plurality of counts to determine a relationship among the plurality of counts (535) and applying second equalization to the received data signal based on the determined relationship among the plurality of counts (540).

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.