28 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.

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.

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.

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.

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.

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 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 provides a high-order amplitude-shift keying (APSK) modulation and demodulation method for severe phase noise. In terms of modulation, APSK constellation diagrams exhibit stronger phase noise resistance compared to orthogonal amplitude modulation (QAM). While conventional APSK cannot be Gray-mapped, this invention proposes an APSK constellation diagram where each ring has the same number of constellation points (a power of 2). The phase distribution of constellation points on different rings is identical, and the number of rings is also a power of 2. Adjacent constellation points within the same ring and adjacent constellation points with the same phase differ by only one bit, allowing for Gray-mapping. This constellation diagram can also determine the ring radius through nonlinear optimization, further enhancing its phase noise resistance compared to traditional QAM constellation diagrams. In terms of demodulation, this invention proposes a soft demodulation method, which achieves the same performance as, and does not reduce, maximum likelihood-based soft demodulation, but significantly reduces complexity.

The invention discloses a distributed array low-frequency communication method, device and system based on a mechanical antenna, and relates to the technical field of wireless communication. Comprising the steps that magnetization vectors of all transmitting antenna units are approximately coplanar in the same plane, all the transmitting antenna units rotate around rotation axes which are perpendicular to the plane and consistent in direction, and motion instruction generation, mechanical control signal conversion and mechanical motion execution are achieved through a layered electromechanical architecture. And enabling each transmitting antenna unit to rotate at the same frequency from the preferable initial phase, thereby realizing the focusing of the magnetic field energy of the transmitted signal at the target receiving point. According to the invention, each transmitting antenna unit can independently calculate the optimal initial phase, overall optimization solution is not needed, distributed control is supported, and the energy utilization efficiency is improved. On the basis of a magnetic field energy focusing mechanism, ASK amplitude shift keying modulation and downlink multi-user communication functions can be realized, the method is suitable for cross-medium scenes such as air-underwater and air-underground, and an efficient solution is provided for low-frequency electromagnetic wave communication.

This application provides an electrical pulse output device and control method for an intermediate frequency (IF) sinusoidal wave carrier. The method includes the following steps: receiving a user-selected training mode and generating a control command based on the training mode, the control command including training pulse parameters and output intensity parameters. Generating an IF sinusoidal wave carrier and a training pulse signal according to the control command. Loading the training pulse signal onto the IF sinusoidal wave carrier using amplitude shift keying (APS) to form a composite stimulation signal. Adjusting the output amplitude of the composite stimulation signal using PWM control based on the output intensity parameters. Real-time acquisition of the output current and determination of whether the output current deviates from a preset output range. When the output current deviates from the preset output range, adjusting the duty cycle in the PWM control to perform closed-loop correction of the composite stimulation signal. Performing AC-DC blocking waveform filtering on the closed-loop corrected composite stimulation signal and outputting an electrical pulse signal. The above method improves output stability.

Described herein are methods of making and using and apparatus for wirelessly communicating data and providing power, particularly from a location exterior to a body and to an implantable device disposed within a body with tissue. The described embodiments provide apparatus and methods for efficiently transfer data and power between an external transceiver and an (implanted) biomedical device. The method is to modulate power carrier, which wirelessly powers the device, using an asynchronous modulation scheme, such as amplitude shift keying (ASK) modulation, with minimal modulation depth in order to not disrupt the power flow. The digital data is encoded in the pulse width, eliminating the need for synchronization to the power carrier signal and further minimizing the power consumption necessary for data transfer. Additionally, a reverse backscatter method for obtaining data from the implant is described that has flexible, low power operation.

A wireless device (WD) and method for low power millimeter wave (mmWave) receiving 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 free-running multi-phase oscillator applied in a multi-phase mixer to provide a multi-phase intermediate frequency signal. The secondary WD determines a beam direction of the ASK modulated signal by correlating phase adjusted combinations of the intermediate frequency signals from the antenna branches with a reference sequence and provides the beam direction to the a main receiver of the secondary WD. The beam direction may be used for an initial communication between the second receiver and the primary WD.

The application provides a multi-frequency multi-path analog optical distribution system and a control method thereof. The method comprises the following steps: processing and modulating a obtained air interface multi-frequency band radio frequency signal to obtain a target multi-frequency band radio frequency signal and an amplitude shift keying signal; combining and converting the target multi-frequency band radio frequency signal and the amplitude shift keying signal to obtain an initial multi-frequency band optical signal, and adjusting and temperature compensating the multi-frequency band optical signal to obtain a target multi-frequency band optical signal; photoelectrically converting the target multi-frequency band optical signal to obtain a target multi-frequency band radio frequency signal and an amplitude shift keying signal, gain compensating the target multi-frequency band radio frequency signal, and analyzing and restoring the amplitude shift keying signal to obtain a gain radio frequency signal and an uplink / downlink switching control level, respectively. The application improves the stability of multi-frequency band signal transmission, efficiently utilizes communication resources according to business needs, and effectively improves the technical effect of poor communication coverage.

In an embodiment method, an envelope voltage of a resonant capacitor of a wireless power receiver in a wireless charging system may be detected at an output node. One or more parameters of the wireless power receiver may be adjusted in order keep the envelope voltage within a pre-determined voltage range. The one or more parameters includes a capacitance across a receiving coil and the resonant capacitor, or a current of a sub-circuit connected between the output node and a ground. An amplitude shift keying (ASK) carrier signal may be detected at a wireless power transmitter of the wireless charging system and attenuated. A demodulated ASK signal may be generated from the attenuated ASK carrier signal based on peak values of the attenuated ASK carrier signal and a zero-crossing signal generated from the attenuated ASK carrier signal.

Various embodiments relate to an amplitude shift keying (ASK) demodulator for demodulating an input signal, comprising: a frequency filter configured to receive the input signal, wherein the frequency filter comprises an adjustable component configured to adjust a frequency response of the frequency filter; a rectifier configured to rectify an output of the frequency filter, wherein the rectifier comprises an adjustable current source configured to adjust a current consumption of the rectifier; a reference signal generator configured to generate a reference signal; a current-to-voltage converter configured to convert a current of the rectified signal into a rectified voltage and to convert a current of the reference signal into a reference voltage; and a comparator configured to compare the rectified voltage to the reference voltage and to generate a demodulated output signal.