72 results about "Frequency domain equalization" patented technology

The invention discloses an adaptive modulation anti-multipath unmanned aerial vehicle swarm communication method and system based on MIMO-OFDM, and relates to the technical field of wireless communication, and the method comprises the steps: receiving a down-conversion baseband; synchronization and compensation are carried out; removing a cyclic prefix and carrying out fast Fourier transform; estimating a channel and noise on the training and pilot frequency, and correcting a common phase; performing frequency domain equalization and soft decision, forward error correction and cyclic redundancy check according to the estimation to obtain a control parameter, decoding a payload according to the control parameter, and performing statistics to form a link quality indication; modulating coding, bandwidth and spatial mode, configuring mapping, power and weight, and packaging physical layer protocol data; carrier sensing conflict avoiding sending, confirmation and retry are adopted to generate media access statistics; and the routing selects the next-hop multi-hop forwarding according to the transmission quality, and performs end-to-end statistics and recharge. Through cooperation of hierarchical synchronization and phase correction with cyclic prefix and FFT, crosstalk is suppressed, channel noise scale optimization soft decision is robust, data decoupling is controlled, and end-to-end availability is improved through multi-hop self-healing recharge.

The invention relates to the technical field of information transmission, in particular to a multi-band processing system for electronic communication, which comprises a signal separation module, a frequency deviation compensation module, an amplitude correction module, a phase correction module and a dynamic feedback adjustment module. According to the invention, a plurality of frequency bands are extracted to execute band-pass filtering to separate signal components, short-time power spectral density is calculated to describe energy distribution, normalization coefficient operation is carried out to enhance frequency domain balance, high-energy component screening is carried out to reduce noise interference, signal effectiveness is improved, and frequency offset compensation calculates a change rate based on adjacent phase data and eliminates abnormal fluctuation. A time domain coefficient is adjusted to correct a frequency offset error, amplitude correction depends on short-time Fourier transform to screen the maximum amplitude to optimize signal consistency, phase adjustment fits a group delay error curve to optimize compensation parameters, dynamic feedback optimizes a strategy according to a signal-to-noise ratio to enhance compensation precision, and signal transmission quality and stability are improved.

The invention discloses a single-carrier signal detection method and device based on an expansion factor graph and Gaussian interference, relates to the field of digital signal processing, solves the problem that a traditional single-carrier frequency domain equalization technology and a message passing algorithm are invalid in an SCMA system, and is characterized in that a signal model is established according to a received signal; modeling the interference term as a Gaussian random variable distribution model to obtain Gaussian information; constructing an expansion factor graph; performing function node updating to obtain transmission information; the transmission message is transmitted between the function node and the variable node according to the expansion factor graph; performing variable node updating on the transmitted information to obtain a normalized variable node message; returning the variable node message to the function node for iterative updating until a preset number of times is reached; after the last iteration is completed, calculating and outputting the log-likelihood ratio of the bit stream according to the variable node information obtained after the iteration update; and the effects of remarkably reducing the calculation burden and remarkably improving the detection performance are achieved.

The invention discloses a time-frequency domain joint channel equalization method for a single-carrier NOMA (Non-Orthogonal Multiple Access) system, and solves the problems that a single carrier is poor in frequency selective fading resistance and is not matched with NOMA power multiplexing signals in the prior art. The method comprises the following steps of: at a receiving end of a single-carrier NOMA system, converting a received signal of each frame into a frequency domain by using FFT (Fast Fourier Transform), and carrying out data separation to obtain a section of unique word sequence and an effective data sequence; estimating channel state information in a frequency domain by utilizing prior information and a section of unique word sequence to obtain a channel estimation result corresponding to each symbol, and performing minimum mean square error frequency domain equalization on a section of effective data sequence according to the result to obtain a corresponding frequency domain signal; performing fine adjustment on the corresponding frequency domain signal in the time domain by using a time domain soft decision equalization algorithm of the power distribution factor to obtain an equalized time domain signal; according to the method, more accurate channel compensation is realized, and the decoding performance and the anti-interference capability of the system are improved.

The invention provides an intelligent image stabilization method and system for an unmanned intelligent turntable. According to the method, an interference library is updated by acquiring electromagnetic interference data, and a signal-to-noise ratio is monitored to generate notch filtering parameters. Based on the parameters, a wave trap is adjusted, non-linear compensation and frequency domain equalization are synchronously triggered, image key frame abrupt change signals are identified at the same time, compensation intensity is adjusted, and closed-loop suppression is formed. In a closed loop, an inner loop extracts high-frequency jitter, an outer loop fuses interference prediction to generate primary parameters, and a cross-domain suppression instruction is output after motion analysis. And instruction-driven anti-interference coding: processing rotation suppression by an attitude coding scheme, processing electromagnetic suppression by a hierarchical error correction protocol, and performing closed-loop verification through link feedback. A verification result is fed back to update the interference library and the compensation intensity, cooperative control of electromagnetic interference and mechanical jitter is achieved, and a stable image is output. By constructing a dynamic closed-loop suppression mechanism, electromagnetic interference and mechanical jitter of the rotary table are cooperatively suppressed, and stable image output of the unmanned intelligent rotary table is realized.

The invention relates to the orthogonal time-frequency-space field of wireless communication, in particular to an OTFS wireless data-energy simultaneous transmission method based on a frequency domain equalizer in a high-mobility environment. A wireless information and energy simultaneous transmission technology is applied to an OTFS transmission system, a power distribution and frequency domain linear equalizer is introduced, a strict mathematical optimization model is established according to a system model and an SWIPT power division structure, an optimal power division factor and an optimal power distribution scheme are solved by using a convex optimization method, and the optimal power division factor and the optimal power distribution scheme are obtained. The objective of the invention is to maximize a partial signal-to-noise ratio or a signal-to-signal plus interference plus noise ratio of a receiving end of a system for information decoding. Simulation results show that the proposed optimal power allocation scheme obtains lower bit error rate performance, and meanwhile, compared with an OFDM transmission system, it is proved that OTFS transmission has better system performance in a high-speed mobile environment.

This application provides a signal receiving method, a transmitting method, a terminal, a system, and a storage medium, relating to, but not limited to, the field of optical communication technology. The receiving terminal removes a unique header from the time-domain signal data according to a first preset length. The time-domain signal data is obtained by transmitting the original signal data from the transmitting terminal through a transmission channel and is a linear convolution of the original signal data and the channel impulse response of the transmission channel. The original signal data includes a data group composed of a unique header of the first preset length and symbol data of the second preset length. Multiple intermediate time-domain data blocks are constructed from the time-domain signal data after removing the unique header, based on the length of the data group, so that each intermediate time-domain data block corresponds to a circular convolution of a data group and the channel impulse response. Frequency domain equalization is performed on the intermediate time-domain data blocks to obtain first equalized time-domain signal data. The embodiments of this application can improve the communication quality of the optical communication system while maintaining transmission capacity.

The invention discloses an OFDM (Orthogonal Frequency Division Multiplexing) communication channel estimation and signal detection method and system, and belongs to the technical field of channel estimation. The OFDM communication channel estimation and signal detection method comprises the following steps: receiving an LDACS downlink OFDM baseband signal; pilot frequency and data subcarriers are separated; arranging pilot frequency observation into a time sequence block according to a frequency index, and constructing a channel estimation subnet input tensor; performing convolution feature extraction and LSTM (Long Short Term Memory) time sequence modeling on the pilot frequency time sequence block in sequence, and outputting channel estimation of each subcarrier; performing frequency domain equalization on the data subcarriers; the signal detection subnet firstly extracts time sequence features through LSTM, then distributes weights through a self-attention mechanism, and finally outputs bit judgment through full connection; performing parameter optimization on the channel estimation subnet and the signal detection subnet by adopting a two-stage training strategy; the number K of subcarriers, the number P of pilots, the CP length and subcarrier mapping are set according to an LDACS frame structure and a protection interval, and an LDACS link layer interface is directly connected. By adopting the OFDM communication channel estimation and signal detection method and system provided by the invention, the problems of poor estimation precision and insufficient robustness of the existing method in a complex LDACS airspace channel environment can be solved.

This invention relates to the fields of high-speed serial communication and digital signal processing, and discloses a low-power approximate equalization circuit and method based on frequency domain error attribute mapping. The circuit includes: a Fast Fourier Transform (FFT) module for converting the time-domain signal to be equalized into a frequency-domain signal; a frequency-domain equalization processing module for equalizing the frequency-domain signal; an Inverse Fast Fourier Transform (IFT) module for converting the equalized frequency-domain signal into a time-domain output signal; and a mapping control module for constructing a three-dimensional error attribute mapping relationship with frequency domain sub-bands as the first dimension, approximate calculation accuracy level as the second dimension, and the error polarity of the approximate arithmetic unit as the third dimension. This invention simultaneously considers frequency domain position, approximate accuracy, and error polarity characteristics in frequency-domain equalization, and achieves system-level error balance without introducing additional compensation circuits, thereby achieving low-power, high-reliability frequency-domain equalization.

The invention relates to a communication system based on combination of deep joint source channel coding and OFDM (Orthogonal Frequency Division Multiplexing), belongs to the technical field of communication, and aims to improve the performance of the communication system. Serial / parallel conversion: dispersing the high-speed serial data to a plurality of subcarriers; iFFT conversion: realizing conversion from a frequency domain to a time domain; parallel / serial conversion: normalizing a time domain signal; adding a cyclic prefix to resist inter-symbol interference; d / A conversion: analog channel transmission is adapted; a / D conversion: digitally receiving the signal; removing a cyclic prefix; restoring the time domain signal; serial / parallel conversion: preparing for subsequent processing; carrying out FFT (Fast Fourier Transform); balancing: correcting channel distortion; parallel / serial conversion: recovering a serial form; and decoding: restoring the original information. According to the method, the two are effectively combined through the complete process, and the communication system performance is improved.

The application discloses a kind of underwater acoustic OFDM communication adaptive frequency domain equalization methods using Transform, it is related to underwater acoustic communication technical field, to solve the problems that existing underwater acoustic OFDM equalization method relies on cyclic prefix, is not sensitive to channel dynamic change, hard decision is prone to error propagation, the Transform framework containing only encoder is used in the present application, the soft decision of received symbol is completed by multi-head self-attention mechanism, and adaptive filtering is realized in combination with feedforward network;In the training phase, the loss function is calculated based on the network output and the true value, and the network parameters and the feedforward equalization filter coefficients are updated synchronously;In the inference phase, the network output is fed back to update the filter coefficients, and the real-time changes of the channel are adapted;The present application significantly reduces the probability of error propagation, and improves the communication reliability under complex underwater acoustic channel.

The invention provides an unmanned aerial vehicle cluster frequency domain equalization method. Firstly, timing is performed by using a synchronization sequence, channel frequency domain response is estimated by using an inserted cyclic prefix, and channel noise is estimated in a frequency domain, so that the accuracy of channel frequency domain response estimation is improved, inter-symbol interference is reduced, the channel transmission quality is improved, and the method is suitable for unmanned aerial vehicle cluster data links and most multipath fading channels. Signal single carrier frequency domain equalization in different scenes can be realized, and the method is used for high-speed signal crosstalk-free receiving.

Procedures, methods, architectures, apparatuses, systems, devices, and computer program products for using a common downlink control channel. A wireless transmit / receive unit detects, based on at least one received signal, a primary synchronization signal associated with a set of primary synchronization signal parameters, detects, based on the at least one received signal, a secondary synchronization signal associated with a set of secondary synchronization signal parameters, determines a time offset of a control channel signal based on at least one of the set of primary synchronization signal parameters and the set of secondary synchronization signal parameters, determines a time location for reception of the control channel signal based on the time offset, and receives a control channel signal based on the time location.

This invention discloses a system and method for acoustic wireless communication that eliminates frequency-selective fading and delay spread. Addressing the problems of frequency-selective fading and delay spread in acoustic wave transmission within the water-based drilling fluid channel inside the drill pipe, it employs orthogonal frequency division multiplexing (OFDM) technology. The transmitting end includes a coding and modulation module, an OFDM modulation module, a power amplification unit, an impedance matching network, and an underwater acoustic transducer. The receiving end includes a synchronization module, a cyclic prefix removal module, a Fourier transform module, a channel estimation module, a channel equalization module, and a decoding module. The synchronization module uses the Schmidl & Cox time-frequency joint synchronization algorithm, the channel estimation module uses the MMSE frequency domain estimation algorithm based on training sequences, and the channel equalization module uses the linear MMSE frequency domain equalization algorithm. Through the co-design of hardware and algorithms, this invention effectively eliminates frequency-selective fading and delay spread, achieving high-speed, low-error-rate acoustic wireless transmission. The data transmission rate can reach 250 kbit / s, and the bit error rate can be reduced to 10%. ‑3 .

The application provides a GMSK underwater acoustic communication method and system based on frequency domain equalization, and the method comprises the following steps: adding a cyclic prefix before a transmission signal sequence, adding a tail symbol after the transmission signal sequence, carrying out conversion and information-symbol mapping, modulating according to a GMSK signal modulation mode based on Laurent decomposition, obtaining a GMSK complex baseband signal, modulating the GMSK complex baseband signal to a carrier as a final transmission signal, and transmitting the final transmission signal to an underwater acoustic channel; receiving the transmission signal in the underwater acoustic channel, carrying out band-pass filtering, time-frequency two-dimensional synchronization, matched filtering, frequency domain equalization and iterative symbol detection on the received signal, obtaining a judged symbol, and completing the GMSK underwater acoustic communication based on the frequency domain equalization. The application has the advantages that the complexity of the symbol detection of the conventional frequency domain equalizer is reduced, and the communication performance is improved.

The invention provides an ultra-wideband electro-optical modulator integrating time domain and frequency domain equalization and a preparation method thereof. The ultra-wideband electro-optical modulator comprises a silicon substrate, a silicon dioxide buried oxide layer, a silicon nitride waveguide, a lead zirconate titanate thin film waveguide, a first coplanar traveling wave electrode and a silicon dioxide embedded layer, the lead zirconate titanate film waveguides form two parallel arms, the first sections of the two parallel arms are positively polarized, the second sections of the two parallel arms are reversely polarized, and the silicon nitride waveguide layer is arranged in the section, connected with the second section, of the first sections; the first coplanar traveling wave electrode is used for transmitting a microwave signal; performing forward phase modulation on the optical signal in the forward polarization section based on the microwave signal, and performing reverse phase modulation on the optical signal in the reverse polarization section; the silicon nitride waveguide introduces time domain delay between a microwave signal and an optical signal; the microwave loss difference of forward phase modulation and reverse phase modulation of the optical signal is improved based on the time domain delay, so that high-frequency modulation response attenuation is compensated, and combined equalization of the time domain and the frequency domain is realized.

The application provides a physical layer identity authentication method and device of a network time synchronization system, and belongs to the technical field of network security, and specifically comprises the following steps: encoding and modulating a sending end original time synchronization message, and inserting an identity authentication pilot sequence; performing pre-distortion of the message signal related to the sending end identity; performing step-by-step equalization of the message signal by each device based on a pre-measured and stored frequency domain channel matrix of a physical channel; a security demodulator extracts a current sub-block identity authentication pilot sequence, estimates, interpolates and stores the pre-distorted sequence, and then performs frequency domain equalization, demodulation and decoding on the current sub-block data sub-carrier by using the pre-distorted sequence to recover the original time synchronization message and a message security indication vector; identity authentication is judged based on the error code rate of the message security indication vector, and the original time synchronization message is sent to a receiving end or discarded according to the judgment. The scheme of the application effectively overcomes external and internal attackers, and realizes time source identity authentication.

The application provides a joint structured OFDM modulation and precoding design method of a large-scale MIMO system, and relates to the technical field of MIMO communication.In the application, a point-to-point large-scale MIMO structured OFDM (mMIMO-SOFDM) system is constructed by using a structured OFDM modulation method; and based on a joint spatial precoding and structured frequency domain equalization scheme, a closed-form solution of each subcarrier frequency domain equalizer, transmission precoding and reception precoding of the mMIMO-SOFDM system is solved.By proposing the structured OFDM scheme, the excessive cyclic prefix overhead caused by the double wideband effect of the large-scale MIMO system is reduced.In addition, the proposed joint spatial precoding and structured frequency domain equalization scheme further improves the spectral efficiency of the system and reduces the peak-to-average ratio.

The invention provides a power distribution transmission method and device under an OCDM frequency selection channel, and the method comprises the steps: converting a time domain signal into a frequency domain through a discrete Fourier transform matrix at a transmitting end, generating a power distribution matrix through combining channel state information and adopting a water injection algorithm, and carrying out the dynamic power precoding of a frequency domain subcarrier; generating a time domain OCDM signal through an inverse discrete Fourier transform matrix and an inverse discrete Fresnel transform matrix, adding a cyclic prefix, and transmitting the time domain OCDM signal; after a receiving end is subjected to prefix removal, a discrete Fourier transform matrix is converted into a frequency domain, a frequency domain equalizer is designed on the basis of a minimum mean square error criterion by utilizing channel diagonalization characteristics, signals are equalized in combination with transmitting power information, and finally time domain information is recovered through an inverse discrete Fourier transform matrix; therefore, the problem of traditional power distribution failure caused by OCDM channel energy dispersion is solved, and through receiving and transmitting joint optimization, diversity gain is fully mined, frequency selective channel fading is adaptively matched, the anti-interference and anti-multipath capabilities of the system are improved, and the spectrum efficiency and the transmission performance are maximized.

The invention discloses a frequency domain equalization method, device and equipment based on matrix inversion, and a storage medium, relates to the technical field of signal processing, and discloses a frequency domain equalization method based on matrix inversion, and the method comprises the steps: carrying out the transmitting end signal processing of a pseudo-random binary sequence at a transmitting end based on a constant amplitude zero autocorrelation sequence, and obtaining a transmitting end optical signal; receiving the sending end optical signal transmitted through the space division multiplexing channel at a receiving end to obtain a receiving end optical signal, and performing receiving end signal processing on the receiving end optical signal to obtain a to-be-balanced signal; determining a current channel matrix of a space division multiplexing channel based on the constant amplitude zero autocorrelation sequence and the signal to be equalized; and performing third-order iteration inversion on the current channel matrix to obtain a current inverse matrix, and performing linear detection on the to-be-balanced signal based on the current inverse matrix to obtain a frequency domain balanced output signal. According to the method, the iteration inversion convergence speed in the frequency domain equalization process can be accelerated, and the channel equalization efficiency is improved.

The invention provides an unmanned aerial vehicle remote ID receiving method with an anti-interference function, which relates to the technical field of unmanned aerial vehicle communication, and comprises the following steps: sampling a strong interference frequency band signal, executing carrier detection to obtain a signal power spectrum, starting a preamble at a maximum power frequency point to detect and identify a signal type, and adopting a corresponding frequency domain equalization demodulation mode to obtain the remote ID of the unmanned aerial vehicle. And performing signal reconstruction to calculate a minimum norm and a channel response matrix, removing a reconstructed signal from the sampling data and repeatedly performing carrier detection until a specific condition is met, and finally obtaining an accurate remoteID signal. Interference can be effectively suppressed, and signal receiving reliability is improved.

Procedures, methods, architectures, apparatuses, systems, devices, and computer program products for using a common downlink control channel are described. A wireless transmit / receive unit, WTRU, detects, based on at least one received signal, a primary synchronization signal associated with a set of primary synchronization signal parameters, detects, based on the at least one received signal, a secondary synchronization signal associated with a set of secondary synchronization signal parameters, determines a time offset of a control channel signal based on at least one of the set of primary synchronization signal parameters and the set of secondary synchronization signal parameters, determines a time location for reception of the control channel signal based on the time offset, and receives a control channel signal based on the time location.

The invention provides a bandwidth equalization system and method based on ADC analog bandwidth insufficiency, relates to the technical field of signal processing, and solves the problem that an existing scheme is difficult to deal with limitation of ADC analog bandwidth insufficiency. The system comprises a radio frequency antenna, a radio frequency switch, a frequency conversion channel, an ADC, a time-frequency conversion module and a bandwidth equalization module which are connected in sequence, and further comprises a control module which is connected with the radio frequency switch, the frequency conversion channel, the time-frequency conversion module and the bandwidth equalization module. And the control module is used for receiving the time-frequency data input from the time-frequency conversion module, determining an equalization factor corresponding to each discrete frequency point according to the time-frequency data, and issuing the equalization factor to the bandwidth equalization module, so that the bandwidth equalization process is carried out based on the equalization factor, and the compensation correction of the full-frequency-point amplitude response in the bandwidth range is completed. According to the invention, the channel bandwidth is expanded by adopting a digital frequency domain equalization method, the analog input bandwidth is effectively improved, and the influence of insufficient analog input bandwidth is reduced.

The invention discloses a deep learning assisted waveform index modulation single carrier communication method, and belongs to the technical field of wireless communication. According to the method, the frequency spectrum efficiency and the system performance are improved by fully utilizing the waveform freedom degree of the single-carrier system. Cooperative transmission of index information and symbol information is realized by jointly optimizing a constellation mapping set, a shaping filter bank and a Bi-LSTM detection network of a receiving end. Specifically, a sending end divides information bits into symbol bits and index bits, the index bits dynamically select a constellation mapping set and a shaping filter, and the symbol bits generate a time domain waveform through the selected constellation and filter. And after a receiving end adopts frequency domain equalization and matched filtering, joint detection of indexes and symbols is completed through a Bi-LSTM network. According to the method, bit mutual information can be achieved through end-to-end training optimization, the signal power and the spectrum template are constrained at the same time, a high-performance and low-complexity index modulation implementation method is provided for a single-carrier system, and the method is suitable for a future high-spectrum-efficiency communication scene.

The invention discloses a noise reduction anti-interference device for a single carrier frequency domain equalization system based on underwater acoustic communication, and relates to the technical field of underwater acoustic communication. The device comprises a cylindrical shell, an angle adjusting mechanism, a water conveying pipe and a single-carrier frequency domain balancing system, and the inner side of the cylindrical shell is provided with a first separation disc and a second separation disc side by side in the axial direction; the first separation disc and the second separation disc divide the interior of the cylindrical shell into a water storage cavity between the first separation disc and the second separation disc, a first sealing cavity close to one side of the first separation disc and a second sealing cavity close to one side of the second separation disc; one side face of the second separation disc is fixedly connected with a water conveying pipe in the circumferential direction. Through the arrangement of the angle adjusting mechanism, the first separation disc, the second separation disc, the noise reduction layer, the flow guide convex strips and the driving assembly and the combination of the components, the device has good anti-interference and noise reduction effects on the single-carrier frequency domain equalization system in the use process.

The present invention relates to the field of information transmission technology, and specifically to a multi-band processing system for electronic communication. The system includes: a signal separation module, a frequency offset compensation module, an amplitude correction module, a phase correction module, and a dynamic feedback adjustment module. In the present invention, signal components are separated by performing band-pass filtering on multiple frequency bands, the short-time power spectral density is calculated to characterize the energy distribution, the normalization coefficient operation enhances the frequency domain equalization, the high-energy component screening reduces the noise interference, and the signal effectiveness is improved. The frequency offset compensation calculates the change rate based on adjacent phase data and eliminates abnormal fluctuations, and adjusts the time-domain coefficient to correct the frequency offset error. The amplitude correction relies on the short-time Fourier transform to screen the maximum amplitude to optimize the signal consistency. The phase adjustment fits the group delay error curve to optimize the compensation parameters. The dynamic feedback optimizes the strategy based on the signal-to-noise ratio trend to enhance the compensation accuracy, and improves the signal transmission quality and stability.

The invention relates to a film lithium niobate electro-optical modulator based on a frequency domain equalizer. The film lithium niobate electro-optical modulator comprises a first 1 * 2 multi-mode interference coupler, a first homodromous modulation area, a second homodromous modulation area, a reverse modulation area and a second 1 * 2 multi-mode interference coupler, in the first same-direction modulation area, modulation of applying a first-direction electric field to an optical signal in the first same-direction modulation area in a push-pull manner through a first ground-signal-ground traveling wave electrode; in the second homonymous modulation area, modulation of applying a first direction electric field to the optical signal in the second homonymous modulation area through a second ground-signal-ground traveling wave electrode in a push-pull manner; and in the reverse modulation region, modulation of applying a second direction electric field to the optical signal in the reverse modulation region in a push-pull manner through a third ground-signal-ground traveling wave electrode. According to the invention, large electro-optical bandwidth can be realized without using a capacitive load traveling wave electrode and extra process conditions.

The invention provides an OFDM (Orthogonal Frequency Division Multiplexing) waveform design method suitable for covered wire transmission, which comprises the steps of CRC (Cyclic Redundancy Check) check, Turbo coding / rate matching, serial-to-parallel conversion, constellation mapping, OFDM modulation and framing, and utilizes a mode of combining an OFDM transmission technology with high spectrum utilization rate with 16QAM (Quadrature Amplitude Modulation) and 4QAM modulation technologies with high information transmission rate. Compared with a traditional single-carrier frequency domain equalization technology and a PAM constellation mapping mode of covered line transmission, the frequency spectrum utilization rate and the data transmission rate are improved; meanwhile, compared with the traditional grid coding, the Turbo coding further improves the coding gain; the insertion of the CP-UW pilot signals can reduce the difficulty of subsequent receiving end signal processing and improve the channel estimation precision, so that distortion and attenuation signals introduced by covered wire long-distance transmission can be recovered more accurately, large-bandwidth and long-distance communication in a covered wire communication environment is realized, and audio and video transmission services can be supported.

A method of equalizing a plurality of single ended channels in a data communication network is disclosed. The method includes receiving real symmetrical input values over each of the plurality of single ended channels at an input of a frequency domain equalizer. Further, the method includes processing the received real symmetrical input values using a plurality of Fast Fourier Transform (FFT) implementations of the frequency domain equalizer. The method further includes processing the outputs of the plurality of FFT implementations using a matrix inversion implementation of the frequency domain equalizer. Furthermore, the method includes processing an output of the matrix inversion implementation using a plurality of Inverse FFT implementations, where each of the plurality of single ended channels is assigned to one of the plurality of Inverse FFT implementations.

The application provides an ultra-wideband electro-optical modulator integrating time domain and frequency domain equalization and a preparation method thereof. The ultra-wideband electro-optical modulator comprises a silicon substrate, a silicon dioxide buried oxygen layer, a silicon nitride waveguide, a lead zirconate titanate thin film waveguide, a first coplanar waveguide electrode and a silicon dioxide embedding layer. The lead zirconate titanate thin film waveguide forms two parallel arms. A first section of the two parallel arms is forwardly polarized, and a second section is reversely polarized. The silicon nitride waveguide layer is arranged in a section of the first section adjacent to the second section. The first coplanar waveguide electrode is used for transmitting a microwave signal. The microwave signal is used for forward phase modulation of an optical signal in the forwardly polarized section and reverse phase modulation of the optical signal in the reversely polarized section. The silicon nitride waveguide introduces a time domain delay between the microwave signal and the optical signal. Based on the time domain delay, a microwave loss difference of the forward phase modulation and the reverse phase modulation of the optical signal is improved, so as to compensate for high-frequency modulation response attenuation and realize joint equalization of the time domain and the frequency domain.