39 results about "Amplitude-shift keying" patented technology

An example device includes a rectifier that converts an AC signal received at an AC side of the rectifier from a wireless charging receive coil into a DC power signal output at a DC side of the rectifier; a first capacitor connected to an upper rail of the AC side; a second capacitor connected to a lower rail of the AC side; a first switch between the first capacitor and a ground; a second switch between the second capacitor and the ground; and a controller configured to: toggle the first switch and the second switch to communicate with an external device; determine, based on a comparison of voltage levels measured at the computing device, whether to set the switches as open or closed when not communicating; and set, responsive to determining to set the switches as closed, the first switch and the second switch as closed when not communicating.

The embodiment of the invention relates to jitter compensation calibration. According to one embodiment, a method for calibrating a local oscillator in an amplitude shift keying (ASK) demodulator of a wireless power transmitter is presented. The method includes: receiving a digital signal corresponding to a voltage or a current of a transmitter coil in a wireless power system implemented with frequency jitter; iteratively adjusting a counter value associated with a jitter table of the local oscillator; wherein for each iteration, the method comprises generating an in-phase (I) component and a quadrature (Q) component using a local oscillator, calculating a metric based on the I component and the Q component, and storing a counter value if the calculated metric exceeds a previously stored optimal metric; and configuring the local oscillator with the stored counter value associated with the optimal metric.

The invention provides an amplitude shift keying phase demodulation device, which comprises a zero-crossing comparator used for extracting a zero-crossing point position of a voltage difference between two ends of an output capacitor of a power transmission circuit; the pulse construction circuit is used for constructing a zero crossing point pulse signal by taking the zero crossing point position as a starting point; the phase signal construction circuit is used for generating an original phase signal according to the zero crossing point pulse signal and a square wave sequence output by a power inverter of the power transmitting circuit; and the bit data extraction circuit extracts the pulse width of the original phase signal by using a pulse counter to obtain multi-bit phase information, and obtains a single-bit ASK signal according to a comparison result of the multi-bit phase information. According to the device disclosed by the invention, a digital-to-analog converter commonly used in phase demodulation is directly canceled, the design cost and the production cost are reduced, and meanwhile, the communication quality problem of a large number of communication requirements in a wireless charging process is solved.

An embodiment includes a forward data receiving device that demodulates and receives an Amplitude Shift Keying (ASK) modulation signal, and includes: an input module configured to receive the ASK modulation signal as an input; a resonance regulating rectifier module configured to regulate and rectify an input voltage of the ASK modulation signal on the basis of Pulse Width Modulation (PWM) according to a preset target voltage, and apply a regulated voltage through an output transistor; and a demodulation module configured to demodulate the ASK modulation signal according to a trend in a change of the input voltage compared to the regulated voltage, wherein the resonance regulating rectifier module includes a comparison unit configured to generate a gate signal for controlling on / off of the output transistor, and generate a sample signal for demodulating the ASK modulation signal.

A method, system, and apparatus for a wireless receiver with intermediate frequency (IF) detection and local oscillator (LO) frequency correction is disclosed. According to one aspect, the wireless receiver is configured to include a LO configured to generate a local oscillator signal, the LO not being phase-locked. The wireless receiver includes a mixer configured to mix the LO signal with an amplitude shift keying (ASK) modulated signal to produce an intermediate frequency (IF) signal. The wireless receiver also includes a tuning circuit configured to estimate a frequency of the IF signal and tune the LO according to the estimated intermediate frequency, and tune the LO to compensate for IF frequency drift. The IF frequency estimation is based on a correlation of the signal in a plurality of frequency bins of a fast Fourier transform (FFT) of the IF signal.

The present application belongs to the technical field of wireless communication, and particularly relates to a covert information transmission method based on RIS regulation of a channel. The purpose of the present application is to face the static channel scene, utilize the RIS regulation of the channel characteristics, enhance the terminal communication performance, and realize the specific information covert transmission in the RIS coverage area. By controlling the RIS to use two kinds of gain different directional pattern steering to regulate the channel environment, the amplitude change virtual amplitude shift keying modulation generated thereby is utilized to perform the unique information covert transmission, and it is not necessary to establish synchronization with the communication party through a control link. On the one hand, the RIS is utilized to construct an enhanced beam according to the node position to realize the signal enhancement of the receiving party, and on the other hand, the information is carried through the steering RIS directional pattern, the terminal can perceive the change of the channel environment by utilizing the existing channel estimation module, the information transmitted by the RIS is distinguished, and the receiving demodulation of the data stream of the normal communication party is not interfered.

The invention discloses an integrated sensing and backscatter communication method and device based on phase-free extension Rytov approximation, and relates to the technical field of communication, and the method comprises the steps: generating a modulation signal through a transmitting antenna based on the load impedance of a dynamic modulation tag, and backscattering the modulation signal to a receiving antenna to measure an RSSI vector, determining an environment object tag structure power vector and a tag antenna power vector, and after sensing and identifying a tag according to the determined combined xRA relative dielectric constant comparison vector and the tag antenna xRA relative dielectric constant comparison vector, activating the tag through a transmitting antenna and transmitting communication data to a receiving antenna by adopting ASK (Amplitude Shift Keying) modulation; and demodulating by combining the environment object tag structure power vector, the tag antenna power vector and the RSSI vector corresponding to the communication data, and determining information bits. Sensing and backscatter communication are realized by adopting non-phase backscatter based on extended Rytov approximation, and backscatter communication which keeps stable is assisted on the whole.

A wireless power receiver may include: a wireless power transfer coil; a rectifier receiving an AC voltage induced in the wireless power transfer coil by the wireless power transmitter, and thereby generating a DC output voltage; a load modulation circuit; and a control circuit operating the rectifier to supply power to a load coupled to the rectifier, and operating the load modulation circuit to communicate with the wireless power transmitter by selectively changing power drawn from the wireless power transfer coil according to an amplitude shift keying modulation scheme having a plurality of modulation depths.

The present application relates to the technical field of communications, and discloses a synchronization signal block detection method and device, and a terminal. The method in embodiments of the present application comprises: a terminal performs detection on a first synchronization signal block on a first resource to obtain target synchronization information; the terminal determines a third resource from among second resources on the basis of the target synchronization information, wherein the second resources are resources associated with a second synchronization signal block; and the terminal performs detection on the second synchronization signal block on the basis of the third resource, wherein the first synchronization signal block uses any one of the following waveforms or modulation modes: amplitude-shift keying (ASK); frequency-shift keying (FSK); on-off keying (OOK)-integrated orthogonal frequency division multiplexing (OFDM); and OFDM.

According to an embodiment, a preamble detection circuit includes a slicer that normalizes a demodulated Amplitude Shift Keying (ASK) signal to generate a binary waveform, a correlator that performs correlation with a reference preamble sequence, and decision logic that determines if a valid preamble is detected. The circuit enables a primary demodulation chain to remain in a low-power state until a valid preamble is identified, providing efficient preamble detection for wireless power transfer systems while minimizing power consumption during communication inactivity. The circuit's configurable parameters allow optimization for different operating conditions and communication protocols.

According to an embodiment, a preamble detection circuit includes a slicer that normalizes a demodulated Amplitude Shift Keying (ASK) signal to generate a binary waveform, a correlator that performs correlation with a reference preamble sequence, and decision logic that determines if a valid preamble is detected. The circuit enables a primary demodulation chain to remain in a low-power state until a valid preamble is identified, providing efficient preamble detection for wireless power transfer systems while minimizing power consumption during communication inactivity. The circuit's configurable parameters allow optimization for different operating conditions and communication protocols.

The present disclosure relates to ASK modulation. According to some embodiments of the present invention, a wireless power receiver that ASK impedance ramps is presented. A method of amplitude shift keying (ASK) modulation in a wireless power receiver includes initiating a transition of an ASK impedance from a first state to a second state, the ASK impedance coupled to a resonant circuit, the resonant circuit including a wireless power receive coil that receives a time-varying magnetic field; transitioning the ASK impedance from the first state to the second state according to the transition over a plurality of switching cycles of the time-varying magnetic field; and maintaining the second state.

Embodiments of the present disclosure relate to devices and methods for decoding data from a wireless signal. An electronic device receives a wireless signal encoded with data in an amplitude shift keying format. The electronic device passes the wireless signal through a low pass filter. The low pass filter has a cutoff frequency between a first frequency associated with a first type of data value and a second frequency associated with a second type of data value. The low pass filter has an effect of changing the wireless signal from the amplitude shift keying format to an on-off keying format without losing data. The electronic device decodes the data from the wireless signal in the on-off keying format.

This disclosure provides systems, methods and apparatuses for adaptive capacitive modulation. A Power Receiver can support power reception at a variety of power levels, such as 5 watts (5W), 15W, or 25W, among other examples. The Power Receiver can select, from among a plurality of modulators having different capacitance levels, which modulator to use for communication with the Power Transmitter. In some aspects, selection of a modulator is based on an estimated induction coupling factor (Kest) and power level. In instances where coupling is high, a first modulator (e.g., having 4.7 nano-farads (nF) capacitance) is used for low power levels (e.g., 5W) and a second modulator (e.g., having 10 nF to 22 nF) is used for high power levels (e.g., 25 W). The Power Receiver can select the modulator capacitance such that the Power Transmitter avoids capacitive region operation and has sufficient amplitude shift keying (ASK) depth for effective communication.

The embodiment of the invention relates to the technical field of communication, in particular to a bit synchronization method of a binary amplitude keying system and a receiver. The bit synchronization method comprises the steps of obtaining bit data and a counting sequence received by a receiver, determining an Nth bit value of an Nth known signal set, determining an Nth counting subset of the counting sequence, responding to dislocation between the Nth known signal set corresponding to the Nth bit value and the Nth counting subset, adjusting a bit period of an (N + 1) th bit value, and aligning the bit period of the (N + i) th bit value with the counting period of the (N + i) th counting subset. According to the embodiment of the invention, the bit value of the known signal set inserted into the modulation signal sequence is utilized to perform alignment correction on the modulation signal set and the corresponding counting subset, so that the deviation existing in bit synchronization is eliminated, the modulation signal set can be aligned with the corresponding counting subset, and the accuracy of bit synchronization is improved. Therefore, the accuracy of bit judgment on the modulation signal set can be improved.

A wireless charging receiving circuit, a terminal device and a wireless charging system are used to prevent the output voltage of the wireless charging receiving circuit from shaking when ASK modulation is performed. The wireless charging receiving circuit comprises a rectifier bridge, a resonance circuit, a first capacitor (C3), a first switch (Q5) and a first synchronous circuit (1221). The resonance circuit is electrically connected between the first AC input end (AC1) and the second AC input end (AC2) of the rectifier bridge. The first switch (Q5) and the first capacitor (C3) are connected in series between the first AC input end (AC1) and the ground (GND). The first synchronous circuit (1221) comprises a first input end (ASK1), a second input end (IN1) and a first output end (OUT1). The first input end (ASK1) is used to input an amplitude shift keying (ASK) modulation signal (ASK_MOD). The second input end (IN1) is electrically connected to the first AC input end (AC1). The first output end (OUT1) is electrically connected to the control end of the first switch (Q5). The first synchronous circuit (1221) is used to output the ASK modulation signal through the first output end (OUT1) when the voltage at the second input end (IN1) changes from a positive voltage to a negative voltage, so that the first switch (Q5) is turned on.

An embodiment includes a forward data receiving device that demodulates and receives an Amplitude Shift Keying (ASK) modulation signal, and includes: an input module configured to receive the ASK modulation signal as an input; a resonance regulating rectifier module configured to regulate and rectify an input voltage of the ASK modulation signal on the basis of Pulse Width Modulation (PWM) according to a preset target voltage, and apply a regulated voltage through an output transistor; and a demodulation module configured to demodulate the ASK modulation signal according to a trend in a change of the input voltage compared to the regulated voltage, wherein the resonance regulating rectifier module includes a comparison unit configured to generate a gate signal for controlling on / off of the output transistor, and generate a sample signal for demodulating the ASK modulation signal.

The invention relates to amplitude shift keying demodulation for wireless chargers. A power transmitter includes a first switch coupled between a first node and a reference voltage node; a second switch configured to be coupled between the power supply and the first node; a coil and a capacitor coupled in series between the first node and a reference voltage node; a first sample and hold (Samp; h) circuitry having an input coupled to the first node; and a timing control circuit configured to generate a first control signal configured to alternately turn on and off the first switch, a second control signal configured to alternately turn on and off the second switch, and a third control signal having the same frequency, and wherein the third control signal determines a first Samp; a sampling time of the H-circuit and has a first predetermined delay starting from a first edge of the first control signal.

A coherent optical receiver comprises a local oscillator, a polarization-diversity actuator configured for modifying an optical signal output by the local oscillator and a 2×2 coupler for coupling the optical signal output by the polarization-diversity actuator and a modulated optical signal received from a coherent optical transmitter. The local oscillator thus provides a boosting effect to the amplitude-shift keying modulated optical signal. The coherent optical receiver comprises a controlling unit performing a domain-switching procedure acting on ellipticity main axis orientation and / or ellipticity phase shift for coarse control of the polarization-diversity actuator, and a phase-refining procedure acting on a controlled error signal injected in the phase of the optical signal output by the polarization-diversity actuator for fine control of the polarization-diversity actuator.

This invention discloses a fiber optic encoding method based on binary amplitude shift keying (APS) and binary wavelength coding. A C-band pulse signal is emitted from a light source module. The pulse signal contains m optical pulses with different center wavelengths but overlapping in the time domain. An optical splitter equally distributes the optical pulses to different binary APS encoders. Each binary APS encoder uses the light entering the encoder to generate a binary amplitude-coded optical pulse with a fixed codeword. Each binary APS encoder output is connected to a multi-port binary fiber Bragg grating wavelength encoder. The binary APS codeword is used as the first encoding, and then each codeword is encoded a second time using different combinations of wavelength components. The final result of the two encodings constitutes the set of all codes. This method solves the problem that existing real-time encoding methods are still limited in scale and cannot meet the requirements of large-scale network applications.

In an embodiment, a wireless power transmitter of a wireless charging system may detect an amplitude shift keying (ASK) carrier signal sent by a wireless power receiver of the wireless charging system, attenuate the ASK carrier signal, and clamp the attenuated ASK carrier signal to a predetermined signal strength range. The wireless power transmitter may detect peak values of the clamped signal, and generate a zero-crossing signal representing zero-crossing points of the clamped signal. The wireless power transmitter may sample the peak values of the clamped signal at timing instants determined by the zero-crossing signal to produce a demodulated ASK envelope signal of the ASK carrier signal.

The invention discloses a low-frequency time code system and method based on a two-dimensional composite chaotic sequence, and relates to the technical field of wireless communication, and the low-frequency time code system based on the two-dimensional composite chaotic sequence mainly comprises a transmitting end and a receiving end. The transmitting end comprises a time coding module, a direct sequence spread spectrum module, an amplitude shift keying modulation module and a frequency hopping spread spectrum module; and the receiving end comprises a de-hopping module, an amplitude shift keying module, a de-spreading module, a filtering module, a judgment module and a decoding module. According to the low-frequency time code system and method based on the two-dimensional composite chaos sequence, the complexity, randomness and statistical property of the chaos spread spectrum sequence can be improved, and the anti-jamming capability, safety and environmental adaptability of the low-frequency time code system are improved.

The invention discloses a wireless power and data synchronous transmission system and method with high-speed half-duplex communication, and the system comprises a power transmission channel which is used for converting an input DC power supply into DC voltage, outputting the DC voltage to an external load, filtering out higher harmonics in the power transmission channel through employing a bilateral LLCC compensation topology method, and outputting the DC voltage to the external load; common-mode current in a power transmission channel is suppressed, and zero-voltage switching is realized at the same time; the data transmission channel adopts an amplitude-shift keying modulation and demodulation method and is used for injecting or extracting a high-frequency carrier signal so as to restore the high-frequency carrier signal to an original baseband signal and realize half-duplex communication; wherein the power transmission channel and the data transmission channel share a pair of coupling coils with taps and ferrite cores. According to the invention, additional wave traps and coupling coils are not needed, the system cost and size are reduced, the data rate and the electric energy transmission efficiency can be considered, and the method can be widely applied to the technical field of electric power and data transmission.

The invention discloses a synchronization signal block detection method and device and a terminal, and belongs to the technical field of communication, and the method comprises the steps that the terminal detects a first synchronization signal block on a first resource, and obtains target synchronization information; the terminal determines a third resource in a second resource based on the target synchronization information, wherein the second resource is a resource associated with a second synchronization signal block; the terminal detects the second synchronization signal block based on the third resource; wherein the first synchronization signal block adopts any one of the following waveform or modulation modes: amplitude shift keying ASK; a frequency shift keying (FSK); an on-off keying (OOK) superposes orthogonal frequency division multiplexing (OFDM); and OFDM.

The invention provides an amplitude-shift keying signal decoding method and device, and the method comprises the steps: carrying out the deburring of an amplitude-shift keying signal when a preamble is not detected, and then detecting the preamble of the amplitude-shift keying signal through a windowing filter; after the preamble is detected, deburring is stopped, windowing filtering is carried out to identify the level of each observation window, and a first byte of the amplitude shift keying signal is detected; after the first byte is detected, windowing filtering is carried out by utilizing a windowing filter to identify the level of each observation window, and the level of each observation window is corrected by utilizing a bidirectional differential coding rule; and decoding the corrected amplitude shift keying signal by using a message analyzer to obtain an amplitude shift keying message. According to the method and the device provided by the invention, the adverse effects of noise and interference frequently encountered in the decoding process of the amplitude-shift keying signal on the decoding effect of the amplitude-shift keying signal are eliminated, and the decoding success rate of the amplitude-shift keying signal is remarkably improved.

According to an embodiment, a method for calibrating a local oscillator in an Amplitude Shift Keying (ASK) demodulator of a wireless power transmitter is proposed. The method includes receiving a digital signal corresponding to a voltage or a current of a transmitter coil in a wireless power system implemented with frequency dithering; iteratively adjusting counter values associated with a dithering table of the local oscillator; wherein for each iteration, the method comprises generating in-phase (I) and quadrature (Q) components using the local oscillator, computing a metric based on the I and Q components, and storing the counter values if the computed metric surpasses a previously stored best metric; and configuring the local oscillator with the stored counter values associated with the best metric.

Embodiments of the present application provide an information transmission method, device, equipment and storage medium, the method comprises: a sending end generates a clock division signal based on a clock auxiliary signal and an encoded original binary information sequence; generate an output signal based on the clock division signal and an amplitude shift keying (ASK) signal, and send to the receiving end; wherein the period of the clock auxiliary signal is: a fraction of the reference time interval corresponding to the encoding operation.

Wireless devices (WDs) and methods for low-power millimeter wave (mmWave) reception for beam tracking are disclosed. According to one aspect, a secondary WD is configured to receive an amplitude shift keying (ASK) modulated signal from a primary WD using at least three antenna branches of a low-power receiver. In each antenna branch, the secondary WD down-converts the ASK modulated signal using a local oscillator signal from a self-excited polyphase oscillator applied in a polyphase mixer to provide a polyphase intermediate frequency signal. The secondary WD determines a beam direction of the ASK modulated signal by correlating a phase-adjusted combination of the intermediate frequency signals from the antenna branches with a reference sequence, and provides the beam direction to a main receiver of the secondary WD. The beam direction can be used for initial communication between the second receiver and the primary WD.

This invention discloses a method, antenna, and electronic device for binary amplitude shift keying (BSK) transmission based on the dual-polarization characteristics of dielectric waveguides, relating to the field of integrated circuit technology. It generates a guided wave signal possessing both BSK and dual-polarization characteristics based on binary amplitude shift keying modulation and dual-polarization. The guided wave signal is radiated, and the radiated signal is used to excite the dielectric waveguide in a dual-polarization manner, generating an excitation signal with two orthogonal degenerate mode transmission characteristics. The excitation signal is transmitted using the dielectric waveguide channel. The radiated signal is received and converted back into a guided wave signal. The guided wave signal is then processed. This invention achieves channel multiplexing of the dielectric waveguide, effectively doubling the channel capacity of the dielectric waveguide, expanding its channel capacity, and significantly improving the communication rate without increasing the transceiver circuitry. It effectively solves the low-bandwidth utilization problem under low-order binary amplitude shift keying modulation, increasing the maximum achievable communication rate.

A wireless implant system has an external device and an implant device; the implant device includes a hermetically sealed housing containing an implant resonant circuit, an implant control circuit and a pressure sensor; the external device includes a primary resonant circuit and a primary control circuit configured to transmit a digitally encoded amplitude shift keyed power signal of a selected duration to the implant device; the implant device is solely energised by the power signal, and the control circuit is configured to receive power from the power signal and to simultaneously demodulate the power signal to decode instructions from the external device; the implant device control circuit is configured to detect when the selected duration has elapsed, determine a pressure from the pressure sensor and to transmit a digitally encoded phase shift keyed information signal representing the determined pressure to the primary resonant circuit.