55 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.

Provided in the embodiments of the present application are an information sending method, an electronic device and a storage medium, the information sending method comprising: generating first information on the basis of second information, and sending the first information, wherein the first information at least occupies one binary amplitude shift keying symbol in the time domain, or at least occupies one orthogonal frequency division multiplexing symbol in the time domain. The embodiments of the present application aim to solve the problem of generating binary amplitude shift keying modulation-based low-power wake-up signals, so as to achieve low-power wake-up signals transmitted by multiple subcarriers, reducing the power consumption of device systems and improving user experience.

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 utility model discloses a multi-system amplitude shift keying modulation energy and signal synchronous transmission system, which comprises a direct current source, an inverter, an energy transmission topological structure, a load, a demodulation circuit and a digital signal processor (DSP) chip, the direct current source is electrically connected with the energy transmission topological structure through the inverter, the energy transmission topological structure is connected with the load, and the load is connected with the demodulation circuit. The energy transmission topological structure is electrically connected with the DSP chip through the demodulation circuit, in the multi-system amplitude shift keying modulation energy and signal synchronous transmission system, a pre-transmission modulation signal generates a PWM variable through the DSP, the PWM variable is directly superposed to a control end of an MOSEFT tube in a full-bridge inverter, and the PWM variable is converted into a PWM variable through the DSP. The phase shift angle of the inverter is controlled through the control circuit, so that the voltage amplitude is changed, M kinds of amplitude transformation are generated, energy and signals are transmitted to the receiving coil through the transmitting coil at the same time, the energy is transmitted to a load through a circuit, and the signals are restored through the current Hall sensor, the demodulation circuit and the DSP.

Near field communications (NFC) may be used of radio frequency identification (RFID) tags and may use amplitude modulated (AM) / amplitude shift keyed (ASK) signals, for instance on-off keying (OOK). The invention discloses an AM scheme where the duration / width of the high amplitude pulse is used to encode data. The invention may encode each symbol to a fixed duration (e.g. 8 periods) with one or two low amplitude periods (P) inserted therein (see Fig. 4). Demodulation may need to consider the duration multiple high amplitude segments together (see. Fig. 6). The amplitude modulation scheme of the invention is intended to enable demodulation without the need for clock recovery. The invention may be used to encode NFC-V or ISO / IEC 15693 symbols / commands.

The present invention relates to "Amplitude Shift Keying Demodulation for a Wireless Charger." 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 a power supply and the first node; a coil and a capacitor coupled in series between the first node and the reference voltage node; a first sample and hold (S&H) circuit having an input coupled to the first node; and a timing control circuit configured to generate a first control signal, a second control signal, and a third control signal having the same frequency, wherein the first control signal is configured to alternately turn the first switch on and off, the second control signal is configured to alternately turn the second switch on and off, and the third control signal determines a sampling time of the first S&H circuit and has a first predetermined delay from a first edge of the first control 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.

The invention provides a composite signal modulation and demodulation method. The method comprises the following steps: dividing an input digital signal into three sub-signal sequences; performing amplitude keying modulation, phase offset keying modulation and pulse characteristic modulation on the sub-signal sequences to generate three modulation signals; generating a composite carrier signal through combination of frequency division multiplexing and time division multiplexing; the signals are sent after power amplification and radio frequency processing; the receiver performs low-noise amplification and down-conversion processing on the received signal; extracting three demodulation components through a digital filter and a time domain separation algorithm; respectively executing amplitude judgment demodulation, phase difference decomposition and pulse feature identification demodulation on the demodulation component; dynamically adjusting a demodulation sequence according to the channel noise level; and finally, recombining into an original digital signal sequence according to a preset rule. According to the invention, the anti-interference capability and transmission efficiency of signal transmission can be improved, and the adaptability and reliability of the system in a complex channel environment are enhanced.

A comparator has a hysteresis value which is adjustable in response to a hysteresis setting control signal. An input of the comparator receives a modulated signal contaminated by in-band noise. A pulsed signal output from the comparator is converted by a digital to analog converter circuit an analog signal. That analog signal is converted by an analog to digital converter to a digital signal value. A comparison circuit compares the digital signal value to a threshold value and generates the hysteresis setting control signal to adjust the hysteresis value of the comparator in response to a result of the comparison in order to suppress the in-band noise from the output of the pulsed signal output from the comparator.

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.

Disclosed are methods, systems, and computer-readable medium to perform operations including methods and systems for receiving, by a user device, eQuery command having a first field. The method proceeds by determining, by the user device, one or more Backscatter Link Frequencies (BLFs) based on the first field. The BLFs transmit a backscatter signal in response to the received eQuery command. The method continues by determining, utilizing a Double Side Band Amplitude Shift Key (DSB-ASK) to modulate an RF carrier, one or more BLF locations and a size of a BLF pool. The method includes indexing, in an increasing order of frequency starting from the lowest frequency point in a lower sideband (LSB), the one or more BLFs. The user device selects a BFR from the one or more BLFs to modulate the DSB-ASK, excluding the one or more BLFs on an upper side band (USB).

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.

According to various embodiments of the present disclosure, provided is a method performed by a first device, the method comprising the steps of: transmitting, to a second device, a carrier wave (CW) or an energizing signal (ES) to which a first modulation is applied with symbol timing information or clock information on the basis of one modulation scheme among amplitude shift keying (ASK), phase shift keying (PSK), or frequency shift keying (FSK); and receiving, from the second device, an uplink signal (UL signal) to which a second modulation is applied on the basis of the symbol timing information or the clock information, wherein the first modulation and the second modulation have the same modulation scheme or different modulation schemes.

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.

The present disclosure relates to systems and methods for improved amplitude shift keying (ASK) communications in wireless power transfer applications. The comparator has a hysteresis value that is adjustable in response to the hysteresis setting control signal. An input of the comparator receives a modulated signal polluted by in-band noise. The pulse signal output from the comparator is converted into an analog signal by a digital-to-analog converter circuit. The analog signal is converted to a digital signal value by an analog-to-digital converter. A comparison circuit compares the digital signal value with a threshold value and generates a hysteresis setting control signal to adjust a hysteresis value of the comparator in response to a result of the comparison so as to suppress in-band noise from an output of the pulse signal output from the comparator.

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.