19 results about "Time domain equalization" patented technology

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit, to a network node, a supported channel latency indication that indicates a supported channel latency for time domain equalization by the UE. The UE may receive, from the network node, a downlink communication based at least in part on the supported channel latency indication. Numerous other aspects are described.

The invention relates to the technical field of signal balanced transmission, and discloses a high-speed photoelectric interconnection signal balanced transmission method and device, and the method comprises the steps: carrying out the bandwidth characteristic and nonlinear characteristic collection of an on-chip photoelectric interconnection channel, and obtaining a channel characteristic data set; scattering parameters of the on-chip photoelectric interconnection channel are measured according to the channel characteristic data set, S21 pre-compensation processing is carried out, and a pre-compensation signal is obtained; on-chip multi-channel parallel transmission is carried out on the pre-compensation signal, and multi-channel transmission state information is collected; inputting the pre-compensation signal and the multi-channel transmission state information into a double-level signal equalization model for linear and nonlinear equalization processing to obtain a first equalization signal; and carrying out mixed compensation operation of time domain equalization and frequency domain equalization on the first equalization signal to obtain a second equalization signal. According to the invention, through real-time monitoring and dynamic compensation, the influence of channel crosstalk and dispersion distortion is effectively inhibited, and the stability of signal transmission is ensured.

The application discloses a low-resource-overhead super-high-speed modulation and demodulation method. In view of the signal processing demand faced by high-frequency bands and large bandwidths in millimeter wave and terahertz communication, the application adopts a parallel architecture to meet the high-speed signal processing demand and correct non-ideal characteristics of a channel; and adopts a fusion processing method to fuse interpolation, anti-aliasing, timing interpolation, matched filtering, time domain equalization and decimation into a multi-phase filter, so that the signal overhead caused by high-speed demodulation is greatly reduced. The application can be applied to a millimeter wave / terahertz super-high-speed transmission system, and provides low-complexity super-high-speed modulation and demodulation to meet the performance and resource demand of super-high-speed transmission.

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.

The present invention discloses a broadband signal real-time digital predistortion method, terminal and system, belonging to the field of information transmission and processing. The present invention adopts framing, coding, shaping filtering, DA conversion, AD coding, matching filtering, clock recovery, carrier recovery, decoding, data extraction, time domain equalization and tap update processing at the ground end, and adopts framing, coding, shaping filtering, DA conversion, AD coding, matching filtering, clock recovery, carrier recovery, decoding and data extraction processing at the satellite end, which can match the distortion of the channel and realize compensation for the distortion of the channel. The satellite-borne platform of the present invention can save the digital equalizer with large resource occupation, and has a relatively obvious improvement on the weight, volume and power consumption of the satellite-borne platform, and can respond to the distortion of the channel in a short time.

The present application relates to the technical field of signal balanced transmission, and discloses a signal balanced transmission method and device for high-speed optoelectronic interconnection, the method comprising: collecting bandwidth characteristics and nonlinear characteristics of an on-chip optoelectronic interconnection channel to obtain a channel characteristic data set; measuring the scattering parameters of the on-chip optoelectronic interconnection channel according to the channel characteristic data set, and performing S21 pre-compensation processing to obtain a pre-compensated signal; performing on-chip multi-channel parallel transmission of the pre-compensated signal, and collecting multi-channel transmission state information; inputting the pre-compensated signal and the multi-channel transmission state information into a two-level signal equalization model for linear and nonlinear equalization processing to obtain a first equalized signal; performing a mixed compensation operation of time domain equalization and frequency domain equalization on the first equalized signal to obtain a second equalized signal. The present application effectively suppresses the influence of channel crosstalk and dispersion distortion through real-time monitoring and dynamic compensation, and ensures the stability of signal transmission.

The invention relates to a single carrier communication method, system and device of a unified architecture and a storage medium, and the method comprises the steps: obtaining a local pilot signal and a receiving signal, extracting a receiving pilot signal from the receiving signal, expanding the local pilot signal and the receiving pilot signal to a preset length through time domain interpolation, obtaining an adjusted local pilot signal and an adjusted receiving pilot signal; performing comparison calculation on the adjusted local pilot signal and the adjusted receiving pilot signal to obtain channel estimation, performing de-noising processing on the channel estimation, and performing interception of a preset area from the de-noised channel estimation to obtain effective channel information; and performing second interpolation operation on the effective channel information to obtain an extended channel frequency domain value, generating a frequency domain filter coefficient according to the extended channel frequency domain value, performing frequency domain equalization processing on the extended channel frequency domain value by using the frequency domain filter coefficient, and performing inverse frequency domain transformation to obtain data output after time domain equalization. The method has the effect of improving the stability of the single-carrier equalization system.

This disclosure provides systems, methods, and apparatus, including computer programs encoded on a computer storage medium, 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 to receive an RF signal, which may be performed in accordance with a detected channel condition. For example, if a wireless device detects a condition associated with a relatively dispersed channel, the wireless device may select a frequency domain equalization, and if the wireless device detects a condition associated with a relatively flat channel, the wireless device may select a time domain equalization. In some implementations, performing time domain equalization may include changing a sampling rate to a symbol rate, such as performing resampling using a Farrow resampler. Such techniques may include a wireless device selecting an equalization scheme associated with a relatively minimum power consumption for a detected channel condition.

The application provides a time domain adaptive equalization method based on bidirectional superimposed training sequence, which uses superimposed training sequence to improve the spectrum utilization of underwater acoustic communication and the tracking ability of time-varying underwater acoustic channel. The method uses linear superimposed structure at the transmitting end and optimizes the power distribution of training sequence and information symbol, and the receiving end uses forward and reverse adaptive time domain equalization parallel processing to construct a bidirectional iterative optimization framework. Meanwhile, the application designs a time domain symbol-by-symbol training sequence interference cancellation mechanism to eliminate the interference of superimposed training sequence on the underwater acoustic communication system. The application mainly uses superimposed training sequence to improve the spectrum utilization of the system, saves bandwidth compared with the traditional inserted training sequence mode, and uses symbol-by-symbol to eliminate the interference of superimposed training sequence on the system. The simulation results prove that the method can improve the performance of the underwater acoustic communication system.

The invention relates to a reference current compensation method, a storage medium and a device, and the method comprises the steps: determining the reverse compensation amount of a voltage loop of a DC circuit at each moment based on an extracted frequency doubling component, and determining the reference current of the DC circuit based on the reverse compensation amount at each moment and an original current reference value; the method comprises the following steps: determining a current reference instantaneous value of a current inner ring of each bridge arm of a plurality of paths of DC circuits of the energy storage system, and when all bridge arms of the DC circuits work and the current reference instantaneous value of any bridge arm exceeds a preset current upper limit value, executing time domain equalization compensation on the bridge arm. According to the method, a current reference instantaneous value of a current inner loop is compensated to suppress ripples, however, when the compensated current reference instantaneous value of any bridge arm of the DC circuit exceeds a hardware limit value under a heavy load working condition, time domain equalization compensation is performed on the bridge arm, and the ripple suppression effect is improved.

The invention provides a communication decoding method and system suitable for a submarine optical cable, and belongs to the technical field of underwater acoustic communication and optical fiber sensing. The method comprises the steps that a double-pulse heterodyne distributed acoustic sensing system is adopted to sense acoustic vibration signals along a submarine optical cable, and phase modulation optical signals are obtained; performing photoelectric conversion, digitization and band-pass filtering on the optical signal; frame synchronization interception is carried out; recovering a symbol sequence through matched filtering and sampling; a symbol sequence is equalized by adopting an adaptive time domain equalizer based on a recursive least square algorithm, and multipath interference is suppressed; and finally, carrying out QPSK demapping to recover the original bit stream. According to the invention, through combination of high-sensitivity distributed sound sensing and a strong anti-interference time domain equalization technology, the problems of insufficient anti-multipath interference capability and limited signal sensing precision in an underwater complex channel in the prior art are solved, and high-reliability and low-bit-error-rate underwater communication based on the existing submarine optical cable is realized.

A joint decoding-iterative frequency-domain equalization method, system, device and medium for GI-free FTN signals. Method: Divide the bit sequence to be transmitted, concatenate all the coded and interleaved bit sequences, perform constellation mapping and FTN shaping processing; The received signal passes through a matched filter and a downsampler to obtain the FTN received signal at the symbol rate; Divide according to the FFT sliding window of length N; Judge the current number of iterations; Use IFFT operation to generate the time-domain equalization result; Send the time-domain equalization result to the eraser to obtain the data not affected by inter-symbol interference and inter-block interference; Soft demodulation; Judge whether to perform the next iteration; The system, device and medium are used to implement a joint decoding-iterative frequency-domain equalization method for GI-free FTN signals; The present invention removes GI from the existing FTN joint decoding-iterative frequency-domain equalization algorithm and deletes the interfered part through an eraser, so as to effectively improve the system spectrum utilization rate on the premise of maintaining the system bit error rate performance, thereby improving its communication performance.

Methods, systems, and devices for wireless communications are described. A wireless communications device may receive a waveform including both a first waveform comprising an orthogonal frequency division multiplexing (OFDM) waveform and a second waveform comprising a single-carrier waveform via a set of time-frequency resources. The wireless device may decode the first waveform based on receiving the waveform, where the first waveform includes one or more reference signals. The wireless communications device may decode the second waveform based on receiving the waveform and on a time domain equalization filter that is based on decoding the one or more reference signals, where the second waveform comprises a set of data bits. In some examples, the waveform may further include a third waveform including a second OFDM waveform and the wireless communications device may decode the third waveform including one or more second reference signals based on receiving the waveform.

The invention discloses a time-frequency two-dimensional soft decision feedback equalization method based on vector approximation message passing. The method comprises the following steps: S1, dividing a time domain data block into B sub-blocks containing overlapped symbols; s2, step-by-step equalization is carried out on the bth sub-block, frequency domain equalization is carried out based on soft frequency domain equalization of vector approximation message transmission in each cycle, then time domain equalization is carried out, and b = 1, 2, 3,..., B; s3, the step S2 is executed repeatedly until step-by-step equalization of all the sub-blocks is completed, and one time of Turbo equalization iteration is completed; and S4, repeatedly executing the steps S2-S3 until a preset Turbo iteration number is reached. Through a two-stage structure of frequency domain block-level pre-equalization and time domain symbol-level fine equalization, and in combination with overlapped sub-block processing, robustness and equalization performance under a strong time-varying channel in underwater acoustic communication are effectively improved.

The invention discloses a frequency hopping communication method suitable for a deep sea RAP channel, and the method comprises the steps: calculating a channel boundary of a sparse multipath structure under the RAP channel according to the prior information of geography, depth and hydrology, and designing a frequency hopping communication signal structure suitable for the RAP channel; estimating channel parameters by using a matched filtering method, and measuring and calculating multipath time delay, phase difference and in-band energy; performing time domain equalization by using the estimated sparse multipath channel, and eliminating inter-symbol interference of communication; and performing frequency response phase shift equalization on each sub-band, and compensating frequency selective attenuation and phase deflection of the deep sea channel. The method is robust in algorithm, is suitable for robust communication in a deep sea RAP channel which is low in signal-to-noise ratio and dynamically fluctuates, and has reference value for communication system design in various typical deep sea sound channels.

The application relates to a reference current compensation method, a storage medium and a device. The method comprises the following steps: determining a reverse compensation amount of a voltage loop of a DC circuit at each moment based on an extracted double-frequency component; determining a current reference instantaneous value of a current inner loop of each bridge arm of a DC circuit input to a multi-path energy storage system based on the reverse compensation amount at each moment and an original current reference value; and performing time domain equalization compensation on a bridge arm when all bridge arms of the DC circuit are working and the current reference instantaneous value of any bridge arm exceeds a preset current upper limit value. The method compensates the current reference instantaneous value of the current inner loop to suppress ripples. However, when the compensated current reference instantaneous value of any bridge arm of the DC circuit exceeds a hardware limit value under a heavy load working condition, the method performs time domain equalization compensation on the bridge arm, thereby improving the ripple suppression effect.

An embodiment of the present invention provides a channel equalization method, device, and storage medium, belonging to the field of communication technologies. The channel equalization method includes: receiving a signal sent by a sender; attempting to perform scrambling synchronization on the signal through a scrambling synchronization module, and determining whether a receiver can lock the scrambling according to a predetermined decision criterion; if the determination result is yes, performing time-domain equalization using a training sequence output by the scrambling synchronization module; if the determination result is no, first performing blind equalization on the signal to obtain a pre-equalized signal, and then performing scrambling synchronization on the pre-equalized signal to complete time-domain equalization. The method of the present invention is used in an environment with low signal-to-noise ratio and / or poor channels, and can avoid the situation where the receiver is deadlocked in the scrambling synchronization stage and fails to complete channel equalization.

The invention provides a channel equalization method of communication equipment, the communication equipment and a storage medium, and belongs to the technical field of communication networks, and the method comprises the following steps: obtaining a weighting matrix which is determined based on a signal error between a pilot frequency receiving signal and a pilot frequency configuration signal; performing frequency domain compensation on the initial receiving signals received each time according to the weighting matrix, and determining receiving frequency domain estimation signals in one-to-one correspondence with the initial receiving signals; performing time domain conversion on the received frequency domain estimation signal to obtain a received time domain estimation signal; performing time domain equalization processing on the received time domain estimation signal through a feed-forward equalizer and a decision feedback equalizer to obtain a target received signal; and carrying out filter coefficient updating on the feed-forward equalizer and the decision feedback equalizer so as to compensate a receiving time domain estimation signal corresponding to an initial receiving signal received next time based on the updated feed-forward equalizer and decision feedback equalizer. According to the embodiment of the invention, the balancing effect can be improved.

The invention relates to a digital equalization method and device of a loudspeaker, a vehicle and a medium. The method comprises the following steps: acquiring a pulse response signal output by the loudspeaker at a signal acquisition point; determining a time domain equalization parameter of the filter according to the obtained pulse response signal and a preset target pulse response signal; performing time domain filtering on a test signal input into the loudspeaker according to the time domain equalization parameter of the filter; converting the signal after time domain filtering to a frequency domain to obtain an amplitude-frequency response signal; performing frequency domain equalization on the amplitude-frequency response signal obtained by conversion to obtain a frequency domain equalization parameter of the filter; and combining the frequency domain equalization parameter of the filter and the time domain equalization parameter of the filter to obtain a target parameter of the filter. According to the scheme, the filter is solved in two steps including the time domain and the frequency domain, balance of the loudspeaker is completed, and the problem that in the related technology, the sound quality of the loudspeaker is poor due to the fact that the filter is designed only for the frequency domain is solved.