312 results about "Transposer" patented technology

An illustrative transmitter can achieve improvement in SN ratio and stability of the signal output under control at the transmission side, even in the case of an optical transmission line having the propagation characteristics susceptible to environmental changes. The transmitter includes: an optical transmission section configured to generate weak signal light and reference light from a transmission light pulse, and transmit the signal light and the reference light to the optical transmission line; and a controller configured to modulate pulse intensity and pulse width of the transmission light pulse according to a transmission line state of probe light having propagated through the optical transmission line.

The application discloses a method for designing and optimizing a VLCP system assisted by light reflection RIS under low signal-to-noise ratio, wherein the VLCP system comprises an intelligent wall adopting a smart surface RIS with mirror reflection, a transmitter and a user terminal equipped with a receiver with a liquid crystal smart surface, communication and positioning signals are integrated into the transmitter, the transmitter comprises an LED, and the method comprises the following steps: under low signal-to-noise ratio, taking asymptotic capacity as a communication metric constraint condition, taking a Cramer-Rao lower bound of positioning error as a positioning metric constraint condition, combining a positioning constraint satisfaction process based on a two-stage greedy algorithm and a communication performance maximization process based on a greedy strategy convex relaxation algorithm, optimizing elements of an RIS allocation matrix to maximize the asymptotic capacity, obtaining an optimal RIS allocation matrix, and completing the design and optimization of the VLCP system. In a low signal-to-noise ratio scene, the VLCP system of the application can significantly improve system performance by applying RIS.

This application provides a method and interface device for auxiliary link state switching, relating to the field of communication technology. In this application, a first auxiliary link transmitter sends a first transmit signal, which is a first level signal; a first auxiliary link receiver receives the first receive signal; wherein, within a first preset time period and under preset conditions, the first auxiliary link switches from a first state to a second state; the preset conditions include: the first auxiliary link receiver continuously receives the first receive signal for a time greater than or equal to a second preset time, and the first auxiliary link transmitter begins continuously transmitting the first transmit signal for a time greater than or equal to a third preset time; the first preset time is a period of time from the start of the first auxiliary link transmitter transmitting the first transmit signal. This application can reduce the power consumption of the auxiliary link.

This application belongs to the field of wireless communication technology, specifically disclosing a transmitter system and method based on real-time feedback and pre-distortion EVM correction. The system includes: a digital pre-corrector, an RF transmit link, a feedback receive link, and a control module connected in sequence; the digital pre-corrector receives correction parameter information from the control module and performs pre-correction processing on the baseband signal according to the correction parameter information; the RF transmit link generates a target RF signal based on the pre-corrected baseband signal and transmits it; the feedback receive link receives the target RF signal and processes it into a feedback digital signal; the control module determines the EVM value of the target RF signal based on the baseband signal and the feedback digital signal, and updates the correction parameter information with the goal of minimizing the EVM value, thereby adjusting the quality of the target RF signal transmitted by the RF transmit link. This application can effectively improve the performance stability and modulation quality of the transmitter in complex operating environments.

In one embodiment, an A / V interconnection architecture is provided that includes a TX A / V endpoint that supports native audio and stereo down-mixed audio on separate networks. The TX A / V endpoint outputs native audio over a video network to an RX A / V endpoint coupled to an A / V sink component that is capable of processing or outputting the native audio, and produces a stereo down-mixed version of the native audio which is output over an audio network to an audio system coupled to an audio sink component that is incapable of handling the native audio. In another embodiment, an A / V interconnection architecture is provide that enables expandable surround sound. If the number of audio channels for a type of surround sound is less than or equal to a number of local amplified output channels, surround sound is provided using only local unpowered speakers. If the number exceeds the number of the local amplified output channels, surround sound is provided using both the local unpowered speakers and one or more add on devices accessible over the audio network.

A system includes a crystal oscillator, a central switch transceiver coupled to the crystal oscillator, and a sensor transceiver. The central switch transceiver includes transmitter circuitry to generate a self- clocked signal carrying first data using a timing reference from the crystal oscillator, and clock and data recovery loop circuitry to operate at a first bandwidth to sample second data received from the sensor transceiver. The sensor transceiver includes reference clock recovery circuitry to decode a reference clock from the self- clocked signal. A phase-locked loop (PLL) circuit generates a transmission clock operating at a second bandwidth from the reference clock for generating the second data. The first bandwidth is greater than or equal to the second bandwidth of the PLL circuit to mitigate jitter experienced by the clock and data recovery loop circuitry due to jitter in the transmission clock.

A coherent transmitter (100, 200) for use in a time division multiple access (TDMA) system is operated in multiple states to enable coherent burst transmission. In an OFF state, the transmitter (100, 200) generates a dummy laser output (fd) from either a dummy laser (102) or an active laser (52) tuned to a dummy frequency different from an active frequency (fa), thereby maintaining thermal and bias stability without adding excess power on an upstream channel (22). In an ON state, the active laser (52) produces an active laser output (fa) that is modulated by a quad-parallel Mach-Zehnder (QPMZ) modulator (60) to transmit data. A thermoelectric cooler (TEC) (58) stabilizes laser temperatures, and a variable optical attenuator (VOA) (54) controls output power. The transmitter (100, 200) is suitable for an optical network unit (ONU) (14) in a passive optical network (PON) (10) communicating with an optical line terminal (OLT) (12).

A method for wireless communication, a transmitter, and a receiver are provided. The method includes the following. A transmitter transmits a first ultra-high reliability (UHR) enhanced long range (ELR) physical layer protocol data unit (PPDU). The first UHR ELR PPDU at least includes a legacy short training field (L-STF), a legacy long training field (L-LTF), a legacy signal (L-SIG) field, a repeated L-SIG (RL-SIG) field, a universal signal (U-SIG) field, a UHR-STF, a UHR-LTF, a data field, and a packet extension (PE) field, where the data field is transmitted at a granularity of a first frequency-domain resource unit with N times duplication in a bandwidth of the first UHR ELR PPDU, and N equals to 4.

An antenna calibration system and method use a transmitter antenna array and a receiver antenna array. Calibration automatically initiates in response to a trigger condition. Each receiver antenna in the receiver antenna array receives frequency-modulated signals from the transmitter antenna array. Optionally, the transmitter antenna array transmits signals of increasing frequency ("up chirps") and / or signals of decreasing frequency ("down chirps"). The frequency-modulated signals are processed through matched filters to determine filter responses. The phase differences for each receiver antenna are calculated based on the filter responses. Calibration coefficients for each receiver antenna are generated based on the calculated phase differences. The phase of signals received from the receiver antennae are then adjusted using the respective calibration coefficients.

A system includes a first device including a first transmitter and a first receiver, and a second device including a second transmitter and a second receiver and configured to communicate with the first device. The two devices perform a first equalization operation by performing a first phase in which the first receiver performs a signal tuning operation on the second transmitter, a second phase in which the second receiver performs a signal tuning operation on the first transmitter, and one or more other phases. The first, second, and other phases may constitute all the phases of the first equalization operation, and some of the other phases may precede the first and second phases. In response to detection of an error after the first equalization operation, the two devices may perform a second equalization operation by performing the first phase, the second phase, or both, but not performing the other phases.

According to one embodiment, a wireless communication device includes a receiver, a controller and a transmitter. The receiver receives a terminal identifier of a first terminal being a target for downlink frequency multiplexing transmission from another wireless communication device, and receives information identifying, of a plurality of frequency components, a first frequency component allocated to the first terminal. The controller selects, of a plurality second terminals belonging to the wireless communication device, a second terminal having a terminal identifier same as that of the first terminal and allocates the first frequency component to the selected second terminal. The transmitter transmits a header at a band including the plurality of frequency components, the header including the terminal identifier of the selected second terminal in a first field corresponding to the first frequency component, and transmits a first frame addressed to the selected second terminal via the first frequency component.

Various aspects of the present disclosure generally relate to wireless communication. Some aspects more specifically relate to multiple input multiple output (MIMO) spinal code encoding schemes. In some aspects, a transmitter may encode a message in accordance with configuration information associated with a MIMO spinal code encoding scheme, resulting in a vector that includes multiple spinal symbols. The transmitter may further map the multiple spinal symbols to multiple transmit antennas, such as by distributing the multiple spinal symbols across multiple layers associated with the multiple transmit antennas and across one or more resource elements (REs) in accordance with the configuration information. The transmitter may transmit, using the multiple transmit antennas and the one or more REs, and a receiver may receive, using multiple receive antennas and the one or more REs, the multiple spinal symbols.

The application discloses a communication system design method of a dynamic linked reconfigurable holographic surface and belongs to the wireless communication technical field.The application realizes the method as follows: 1, a single-source transmitter and a receiver are constructed, the transmitter is provided with a precoder, a switch selection link and a reconfigurable holographic surface, and the receiver is provided with a combiner, a switch selection link and a reconfigurable holographic surface; 2, a digital beam forming signal is input to the holographic antenna through a feed source selected by the switch selection link to form a transmitting signal; 3, a channel matrix is acquired, the feed source position is selected by utilizing an interactive entropy iteration, digital beam forming is realized through power distribution, the RHS unit excitation is realized by utilizing an element-by-element iteration, and the beam forming of the overall signal is completed; 4, a receiving signal is acquired by the receiver through a RHS combiner and a digital signal combiner mode; compared with the prior art, the application improves the communication transmission rate of the reconfigurable holographic surface in the random channel transformation scene.

The present invention provides a receiving device and a receiving method that can improve the receiving performance of receiving radio waves transmitted by a transmitter, even when the receiving antenna cannot be positioned away from a noise source. [Solution] The first receiving antenna 18 and the second receiving antenna 19, which receive the transmitted radio waves Sa transmitted from the transmitter 3, are positioned along the propagation path of the transmitted radio waves Sa which are diffracted by the radio wave shielding provided on the vehicle 2, at a position where they receive noise waves transmitted from the noise source of the vehicle 2 in phase, and at positions spaced apart d from each other. The conversion unit 15 converts the phase of the first received radio wave Sb1 received by the first receiving antenna 18 to the phase of the second received radio wave Sb2 received by the second receiving antenna 19. The combiner 16 combines the first received radio wave Sb1 input from the conversion unit 15 and the second received radio wave Sb2 received by the second receiving antenna 19 and outputs it to the receiver 17.

The present application relates to the technical field of geophysical electromagnetic exploration data processing, and specifically discloses a kind of orthogonal digital phase-sensitive detection time-frequency electromagnetic complex response extraction method, automatically extracts base frequency and initial phase using transmitter stored time-stamped current data, constructs zero initial phase orthogonal reference signal, carries out two-way digital phase-sensitive detection to receiver full waveform sampling data, obtains in-phase component and quadrature component, so as to calculate the complex response amplitude and phase information of target frequency.The present application does not need analog phase-locked loop and artificial phase modulation process, can stably extract complex response parameters under strong interference and strong noise background, is especially suitable for array time-frequency electromagnetic receiver full waveform sampling data post-processing, without transmitting current waveform to each receiving node in real time, improves the flexibility and scalability of time-frequency electromagnetic system.

The application belongs to the technical field of ocean exploration, and specifically discloses a seabed bottom type in-situ detection device and method. The device comprises an upper computer, a transmitter and a receiver. At the transmitter end, the application modulates selected initial identification information symbols into a low-frequency carrier frequency band in a multi-band linear frequency modulation manner to generate a low-frequency modulated wave, and then modulates the low-frequency modulated wave into a high-frequency carrier in an amplitude modulation manner to form a narrow underwater acoustic beam. At the receiver end, because different types of seabed have different self-demodulation capabilities and underwater sound dissipation characteristics at different bit positions of the identification information symbols, T-BOK demodulation is realized through low-frequency echo reception to obtain a three-state identification code, and the delay information of each bit of the three-state identification code is recorded. Through the three-state identification code demodulated by the low-frequency echo, the delay information of each bit of the three-state identification code, and a three-state identification code codebook generated in advance, the seabed bottom type and distribution characteristic parameters are obtained.

This invention provides a high-precision calibration system and method for a multi-channel ADC, relating to the field of communication technology. The system includes a digital transmitter, a DAC module, a calibration loop, and a multi-channel ADC module connected sequentially. It also includes a correlation module, a parameter estimation module, and a compensation module. The correlation module is connected to both the digital transmitter and the multi-channel ADC module. The parameter estimation module is connected to both the correlation module and the compensation module. The compensation module is also connected to the multi-channel ADC module. The calibration loop connects the end of the transmit link and the beginning of the receive link. This invention combines the analog and digital domains through the calibration loop, achieving deviation compensation by performing a single cross-correlation operation and parameter estimation on the local reference signal and multiple sub-signals. This method eliminates the need to redesign analog circuits and does not rely on external instruments for calibration. It features low hardware complexity, high stability, and a short estimation cycle, without affecting normal service operation.

The present invention provides an antenna configuration, transceiver configuration, and communication system for full-duplex transmission within the radio band that have high isolation characteristics between the transmitter and receiver within the same transceiver configuration and overcome the aforementioned drawbacks. [Solution] In the antenna device of the present invention, each antenna radiates and receives electromagnetic waves simultaneously, the plurality of antennas are arranged along a common virtual cylindrical jacket surrounding a common central axis of the antenna arrangement, the related centers of gravity of adjacent antennas are equidistant from each other, each antenna is electrically and / or magnetically connected to at least one first signal line of the transceiver arrangement and at least one second signal line of the transceiver arrangement, and in each antenna, at least one first signal line is oriented orthogonally with respect to at least one second signal line.

The application discloses a kind of transmitter chip architecture of ultra-low area high output power, it is related to wireless communication circuit technical field.The architecture includes mutually coupled first single-core oscillator OSC1, second single-core oscillator OSC2, driving voltage synthesis transformer TFM1, power amplifier active core PA, output matching transformer TFM2 and parallel capacitor C1-C6.OSC1 and OSC2 are realized same frequency same phase oscillation by electrical or electromagnetic coupling, TFM1 is matched with C1-C4, and two-way oscillation voltage is superimposed in phase, generates amplitude doubling driving voltage, is directly input PA amplification, and is output after completing impedance matching by TFM2 and C5-C6 again.Compared with traditional oscillator, driving amplifier and power amplifier architecture, the application omits driving amplifier and interstage matching transformer, and the area of core circuit is ≤0.038mm 2 , output power reaches 13dBm, realizes the synergistic optimization of ultra-low area and high output power, and adapts miniaturization, high-performance communication demand.

A transmitter employs simple inverters to predrive cascode-connected pull-up and pull-down output stages. Each output stage includes a drive transistor with a thin gate dielectric for fast switching. The drive transistor is cascode connected to a set of parallel-connected transistors. Calibration circuitry selectively enables the parallel-connected transistors to calibrate output resistance. The parallel transistors converge at a single resistor.

The present application relates to the field of radio signal identification, and particularly relates to a cross-domain few-shot specific emitter identification method based on self-supervised learning and transfer learning, comprising: adopting a self-supervised joint embedding method, pre-training a first model and a second model by using an upstream task pre-training dataset, regularizing a first autocorrelation matrix output by the first model by using von Neumann entropy, calculating the cosine similarity between the feature projections output by the first model and the second model, and updating the parameters of the first model based on the regularized autocorrelation matrix and the cosine similarity; migrating the pre-trained first encoder to a feature extractor, inputting a downstream task fine-tuning dataset into the connected feature extractor and classification head to fine-tune the feature extractor and the classification head; inputting a wireless signal into the fine-tuned feature extractor and classification head to obtain the predicted transmitter category of the signal. The present application achieves good identification accuracy under the conditions of few samples and low cost.

The application discloses an FPGA-based adaptive OFDM frequency hopping system and method, and solves the problem of poor anti-interference ability of the current OFDM communication system, which leads to the decline of the system transmission information ability.The application combines the OFDM system with the frequency hopping system, and adds an adaptive control module; the receiver part of the system can detect the quality of the channel in real time, and can change the frequency hopping frequency points and the symbol modulation and demodulation modes of the transmitter and the receiver in real time according to the interference degree, so that the problem of the decline of the transmission information ability is effectively solved, the anti-interference ability of the OFDM communication system is improved, and the transmission reliability is improved.The application can be applied to the field of communication technology.

The invention relates to a foundation for a tower for a wind turbine, a transmitter, for example for mobile communications, or an overhead power line, with at least two superimposed foundation levels (2, 3), wherein at least two foundation levels (2, 3) each have at least two adjacent prefabricated concrete elements (4, 5), wherein the prefabricated concrete elements (4, 5) each have at least one base section (41, 51) and at least one web section (42, 52), each of which has a bottom surface (411, 511, 422, 522), wherein the at least one base section has at least one opening for receiving a tendon, which are arranged such that the openings of superimposed base sections (41, 51) are aligned, wherein at least one offset section (43, 53) is provided between the base section (41, 51) and the web section (42, 52) of the at least two concrete elements (4, 5) of at least one foundation level (2, 3). is,so that the undersides (422, 522) of the web sections (42, 52) of the concrete elements (4, 5) of at least two superimposed foundation levels (2, 3) can be arranged essentially at the same height.

This disclosure provides systems, methods, and devices for wireless communication that support noise indicator intermediated signal demodulation. An apparatus for wireless communication may include a communication interface configured to receive a noise indicator that indicates a transmitter noise associated with a transmitter. Additionally, the apparatus may include a processor system configured to demodulate, based on a noise covariance matrix, a signal received from the transmitter. The noise covariance matrix may be based on the noise indicator.

A radiofrequency (RF) system may comprise a duplexer or multiplexer, e.g., when the transmitted signal frequency is different from the receiving frequency in a RF communication system, a duplexer may combine the transmitter and the receiver into the same antenna. In other possible RF communication systems, where the transmit (Tx) and receive (Rx) paths utilize the same frequencies (which are duplexed in time domain), a multiplexer may be used to connect different transmitters, receivers and / or transceivers that are using different frequencies, into one common / antenna port. A multiplexer may be used to share an antenna between multiple transceivers at different frequencies. In some embodiments, the multiplexer may be tunable to different frequencies during operation.

The dynamic scheduling request framework reduces the need to reduce peak transmit power when a User Equipment (UE) approaches Specific Absorption Rate (SAR) limits. This preserves the ability of the UE to overcome interference, for example when near the cell edge, reduces dropouts, and maintains the advantages of High Power UEs (HP UEs), such as Power Class 2 (PC2) devices. If a combination of the current buffer status report (BSR), current peak transmit power, and historical average transmit power—indicating more data to transmit—suggests a risk that the UE is violating SAR limits, logic within the UE and / or network reduces the number of resource blocks (RBs) allocated to the UE. Average transmit power is reduced by lowering the transmitter's duty cycle while maintaining the current peak transmit power. Once the risk of SAR violation is mitigated, RB allocation returns to normal.

A pipe for a transmitter / receiver, an acoustic system comprising such a pipe, and a method for manufacturing such a pipe and acoustic system are disclosed. The pipe (1) comprises a pipe body (10) with a pipe wall (20), and a mounting space (30) provided in the pipe wall (20). The mounting space is a through-hole in the pipe wall (20) formed by plastic deformation of the pipe wall and allowing the mounting of a transmitter / receiver. Fig. 4

The present application belongs to the field of exploration geophysics, and particularly relates to a transient electromagnetic perspective detection method for water-bearing area in a coal mining face. Measurement points are arranged in two roadways of the coal mining face. A transmitting wire frame is fixed at a first point of a transmitting roadway for transmission, and a receiving wire frame receives at different positions in a certain range of the opposite roadway. The transmitter and the receiver are consistent in time and can synchronously collect. After the first point transmits, the transmitting coil is moved to a next position for transmission at a second point. Similarly, the receiving coil can receive in a certain range of the opposite roadway. After the second point transmits, the third point transmits, and so on until the transmission of the whole roadway is completed. The transmitting roadway and the receiving roadway are exchanged, and the above steps are repeated until the whole face is detected, and then inversion calculation is performed. The present application can solve the problems of low positioning accuracy of water-bearing abnormal body and inaccurate abnormal shape discrimination of the existing mine transient electromagnetic method.