283results about "Phase-modulated carrier systems" patented technology

Embodiments are provided wherein a mobile device that is associated with a cellular system is configured to communicate with a second device that is associated with the cellular system subject to a time-varying, dispersive, multipath fading environment. The mobile device comprises an antenna system comprising a plurality of polarizations and a processor that is configured to reduce a cross-polarization interference caused by said time-varying, dispersive, multipath fading environment while the mobile device uses a first polarization and a second polarization of the plurality of polarizations to increase a transmission throughput of information and / or a reception throughput of information. The mobile device is further configured to perform operations including processing first and second signals received respectively on the first and second polarizations and to use a plurality of receive channel coefficients to perform first and second mathematical operations on the first and second signal, respectively.

The invention discloses an HRR-based acoustic fire hazard type identification method, device and equipment and a medium, and relates to the technical field of fire hazard detection, and the method comprises the steps: obtaining an original acoustic signal through transmitting a high-frequency modulation ultrasonic wave and receiving a flame region reflection echo, obtaining channel impulse response data through channel estimation, and carrying out the channel impulse response data; flame features are extracted, a heat release rate curve is calculated and generated, finally fire type identification and fire behavior stage determination are completed based on the curve, dense smoke, shielding and illumination interference can be resisted, accurate quantification of the heat release rate is realized, fire type identification and fire behavior development stage determination can be finely carried out, and the accuracy of fire behavior determination is improved. And a stable and reliable technical support is provided for fire monitoring and emergency decision making.

The invention discloses an active pen and touch screen interaction system resistant to common-mode interference and a signal demodulation method. The system comprises a signal receiving terminal and a signal transmitting terminal. The signal transmitting terminal modulates data to be transmitted by adopting a differential binary phase shift keying modulation method, and transmits a generated modulation signal to the signal receiving terminal; the analog front-end receiving module is coupled with the signal transmitting terminal, receives the modulation signal and outputs a digital square wave signal after fidelity extraction processing; and the digital demodulation processing module performs differential coherent digital demodulation on the digital square wave signal based on the prior characteristics of the modulation signal, inhibits residual noise and recovers data to be sent. The analog front end focuses strong common-mode noise suppression and analog filtering, the digital demodulation algorithm performs secondary digital purification by using signal time sequence characteristics, and the two constructs an efficient anti-interference pipeline. Meanwhile, the regular square wave signals can be directly processed through differential coherent demodulation, and the requirements for performance and power consumption of a rear-end processor are lowered.

The invention provides a method and a device for processing a signal, aiming at the problem of poor demodulation performance caused by CPM symbol phase accumulation, the demodulation performance of the CPM symbol can be improved by carrying out differential processing on a modulation symbol input into continuous phase modulation (CPM) at a signal transmitting end and breaking the continuous accumulation of the symbol phase of the CPM by a receiving end through de-differential processing.

Aspects of this disclosure relate to squelching a symbol at a symbol boundary. A transmit squelch block can squelch a portion of a symbol at a symbol boundary. The transmit squelch block can be included in a symbol based envelope tracking system. Transmit squelching can reduce spurious emissions associated a symbol based envelope tracking voltage toggling on a symbol boundary.

Apparatuses and methods for reporting spatial-domain channel properties. A method performed by a user equipment (UE) includes receiving information about a report associated with a channel state information (CSI) resource setting including a CSI reference-signal (CSI-RS) resource with P CSI-RS ports, a report quantity set to 'sdcp', and a reporting band and measuring the CSI-RS resource based on the information. The method further includes determining, based on the information, a correlation value between a first antenna port group and a second antenna port group and transmitting the report including the correlation value. The correlation value is normalized by at least one of norm values of the first antenna port group and second antenna port group over the reporting band. The first antenna port group corresponds to a first subset of the P CSI-RS ports. The second antenna port group corresponds to a second subset of the P CSI-RS ports.

A method, phase shifter, and user equipment (UE) for transmitting and receiving signals in a phased array are disclosed. The method includes receiving a transmit single-ended input signal on a single-ended side of a balun of the phase shifter and generating a transmit differential input signal on a differential side of the balun through the balun; generating a transmit in-phase signal and a transmit quadrature signal based on the transmit differential input signal through a differential quadrature coupler of the phase shifter; and combining the transmit in-phase signal and the transmit quadrature signal into a differential phase-shifted output signal through a differential attenuator of the phase shifter.

Methods, systems, and devices for wireless communications are described. A first wireless device may identify a set of data resource elements for transmitting data in one or more symbols periods. The first wireless device may generate, for the one or more symbol periods based on the set of data resource elements, a sequence of a set of pilot resource elements associated with the set of data resource elements, the sequence of the set of pilot resource elements including a demodulation reference signal. The first wireless device may transmit, to a second wireless device in the one or more symbol periods, the set of data resource elements and the set of pilot resource elements. The second wireless device may decode a first subset of the set of pilot resource elements based on a second subset of the set of pilot resource elements to determine the demodulation reference signal.

The invention discloses a signal demodulation method, system and device based on an orchestrable multifunctional control, and a medium, mainly relates to the technical field of signal demodulation, and is used for solving the problems of inaccurate signal analysis and mismatching of measurement types in the existing scheme. Comprising the steps that a control device circularly scans target information related to a binding relation, and circularly acquires an identification result of a current target signal; counting the identification result of each target signal returned by the control equipment; when the identification result of the same target signal returned by the control equipment is the same identification result for continuous N times, determining that the identification result is the final identification result of the current target signal; when the condition that different recognition results appear for N times is not met, counting and accumulating according to the latest recognition result until the same recognition results appear for N times continuously; and according to the final identification result or the external operation, determining a corresponding preset control and guard action, and according to the preset control and guard action, completing signal demodulation of the corresponding target signal.

The invention provides a signal-to-noise ratio estimation method and device suitable for PSK (Phase Shift Keying) modulation. The method comprises the following steps: calculating the average power of an input signal sequence; estimating the average power of the pilot frequency sequence; and calculating a signal-to-noise ratio. According to the method, the influence degree of noise on the distance between the PSK modulation signal and the original point in the constellation diagram is estimated, a traditional method for calculating the signal-to-noise ratio by estimating the deviation degree of the actual signal from the ideal signal due to the influence of noise is replaced, high accuracy can still be kept when the signal is influenced by Doppler frequency deviation and sampling deviation, the method is more suitable for an actual communication system, and compared with the prior art, the method has the advantages of simple operation and low cost. In an actual communication system, signal-to-noise ratio estimation is usually carried out after signal timing synchronization and carrier synchronization processing, however, the signal-to-noise ratio calculation method provided by the invention can be used for estimating the signal-to-noise ratio after synchronization before synchronization according to PSK modulation characteristics, and has certain application advantages in scenes such as switching modulation waveforms according to the signal-to-noise ratio.

The invention relates to a method for processing a received signal derived from two continuous phase-modulated signals, comprising the following steps: frequency shifting (102) of the squared received signal so as to produce: a first and a second shifted signal having a spectrum shifted by D / 2 and -D / 2 respectively with respect to a spectrum of the squared signal, where D is a bit rate of each of the two continuous phase-modulated signals; determination (108): of a first and a second frequency at which a power spectral density of the first and second shifted signals takes a first and second maximum value respectively, of a third frequency at which a power spectral density of the squared signal takes a third maximum value; central tendency measurement of the frequencies to estimate (110) a frequency difference between the received signal and each of the two continuous phase-modulated signals. Figure for the abstract: Fig. 3

A method for a user equipment (UE) includes receiving first information for a first physical downlink control channel (PDCCH) search space set and receiving second information for a second PDCCH search space set. The first PDCCH search space set is a UE-specific, includes first PDCCH candidates associated with a first modulation order, and second PDCCH candidates associated with a second modulation order. The second PDCCH search space set is not UE-specific and includes only third PDCCH candidates associated with the first modulation order. The method further includes determining a first, second, and third PDCCH candidate from the first, second, and third PDCCH candidates, respectively. The method further includes receiving a first and second PDCCH in the first and second PDCCH candidate based on the first and second modulation order, respectively, and receiving a third PDCCH in the third PDCCH candidate based on the first modulation order.

A communication method and apparatus are provided, are applied to the field of communication technologies, may be applied to a wireless local area network system supporting 802.11 series protocols such as a next-generation Wi-Fi protocol of IEEE 802.11ax like 802.11be, Wi-Fi 7, or EHT, and 802.11bn, Wi-Fi 8, UHR, Wi-Fi AI, or millimeter wave (MMW), and may be further applied to a WPAN system, a sensing system, and the like supporting UWB. A first communication apparatus generates a PPDU, and sends the PPDU. A second communication apparatus receives the PPDU, and parses the PPDU. The PPDU includes first indication information. The first indication information may indicate a first modulation scheme set and a coding rate. The first modulation scheme set is one of N modulation scheme sets obtained through classification based on W modulation schemes. Q modulation schemes in the first modulation scheme set are used to modulate the PPDU.

Methods, systems, and devices for wireless communications are described. A wireless communication device may receive a communication signal that includes multiple layers. The signal may include at least one layer that is associated with a probabilistic shaping signal. The wireless communication device may apply one or more probabilistic shaping parameters to the communication signal and obtain a preprocessed signal. The application of the one or more probabilistic shaping parameters may include performing one or more matrix decomposition operations to obtain the preprocessed signal and a preprocessed channel estimate. The preprocessed signal and the preprocessed channel estimate may include probability information associated with the probabilistic shaping signal based on the application of the one or more probabilistic shaping parameters. Accordingly, the wireless communication device may demodulate the communication signal based on the preprocessed signal information.

The present application provides a signal processing method and apparatus. To address the problem of poor demodulation performance caused by phase accumulation of continuous phase modulation (CPM) symbols, differential processing is performed on modulation symbols for CPM input at a signal transmitting end, and then inverse differential processing is performed at a receiving end to disrupt the continuous phase accumulation of CPM symbols, thereby improving CPM symbol demodulation performance.

The application discloses a method and system for underwater acoustic signal denoising based on a generative adversarial network. Through the division and cooperation of the feature separation branch and the signal denoising branch, the network has the advantages of interpretability and modularity. Meanwhile, the separation loss function of the multi-loss function is combined, which not only ensures the efficient separation of the target signal and the interference feature, but also strengthens the physical authenticity of the underwater acoustic signal through the true and false discrimination of the discriminator. The designed signal denoising branch guarantees real-time processing through the design of the causal convolution module and the adaptive forget gate module, and can cope with the complexity of the time-varying channel to ensure real-time noise reduction application.

The invention relates to the field of laser communication, and provides a parallel low-complexity frequency offset compensation method, device, equipment and medium, and the method comprises the steps: calculating the M-power variance of N M-PSK signals which are input in parallel, and carrying out the first frequency offset compensation of an original signal through the difference result of N points at intervals; the M-PSK signal is a PSK signal of which the modulation order is M; and solving an N-point M-power spectrum for the signal after the first frequency offset compensation, and performing second frequency offset compensation for the signal after the first frequency offset compensation by using the spectral line position of the M-power spectrum. The two-stage frequency offset compensation method provided by the invention has the characteristics of high dynamic range, low resource consumption, no need of data assistance and support of burst signal processing, and is particularly suitable for a frequency offset compensation scene in a high-speed laser communication link.

The invention relates to the technical field of isolated transmission, and discloses a data transmission performance optimization circuit, a demodulation device and a digital isolator, the demodulation device is suitable for generating a first demodulation signal and a second demodulation signal in the process of demodulating a differential modulation signal, and the data transmission performance optimization circuit comprises a detection unit, a processing unit and a processing unit, the detection unit is configured to detect at least one of the differential modulation signals so as to determine the carrier state of the differential modulation signals; and the signal adjusting unit is configured to adjust at least one of the first demodulation signal and the second demodulation signal according to the carrier state, so that the absolute value of the voltage difference value between the first demodulation signal and the second demodulation signal is reduced in the carrier state switching process of the differential modulation signal. According to the invention, the dynamic adjustment of the digital isolator on the PD index is realized, so that the performance optimization effect of the digital isolator is comprehensively improved, and the signal transmission performance is greatly improved.

Systems and methods are provided for detecting and analyzing changes in a body. A system includes an electric field generator, an external sensor device, a quadrature demodulator, and a controller. The electric field generator is configured to generate an electric field that associates with a body. The external sensor device sends information to the electric field generator and is configured to detect a physical change in the body in the electric field, where the physical change causes a frequency change of the electric field. The quadrature demodulator receives the electric field from the electric field generator and is configured to detect the frequency change of the electric field and to produce a detected response. The controller, coupled to the electric field generator, is configured to output a frequency control signal to the electric field generator and to modify the frequency of the electric field by adjusting the frequency control signal.

A communication method and a communication apparatus are provided. The method includes: a relay node receiving a first signal, the first signal including a first modulation symbol from a first source node and a second modulation symbol from a second source node, wherein the first modulation symbol includes a symbol mapped on a first constellation diagram, the first constellation diagram having multiple constellation points in the same quadrant, and the minimum distance between two adjacent constellation points in the same quadrant being less than 2k, where k is a constellation mapping normalization factor; the second modulation symbol includes a symbol mapped on a second constellation diagram, the second constellation diagram having no more than one constellation point in each quadrant, and the transmission power of the second modulation symbol being determined based on the transmission power of the first modulation symbol; the relay node then forwards the first signal. By reducing the distance between adjacent constellation points in the same quadrant and re-determining the transmission power, the bit error rate of the first signal received by the relay node is improved, thereby greatly reducing the risk of the relay node eavesdropping on information.

A transmission method and device based on preamble puncturing in a wireless LAN system are disclosed. A method by which a first STA performs communication in a wireless LAN system, according to one embodiment of the present disclosure, comprises the steps of: receiving a first PPDU from a second STA; acquiring information related to at least one first punctured resource unit; and transmitting, in response to the first PPDU, to the second STA, a second PPDU based on at least one second punctured resource unit, wherein the at least one first punctured resource unit can be at least one part of the at least one second punctured resource unit.

Methods and apparatus, including computer program products, are provided for pi / 2 BPSK initial access. In some example embodiments, a method can be provided that includes receiving, at a user equipment, information indicating network support for initial network access based on a pi / 2 binary phase shift keying (pi / 2-BPSK) modulation and coding scheme; and in response to the received system information, performing initial network access by at least sending a connection request based on the pi / 2-BPSK modulation and coding scheme. Related systems, methods, and articles of manufacture are also described.

A framework is provided for generating a MA signal based on modulating at least one first stream of bits using a first modulation type to generate at least one first modulated symbol from each of the at least one first stream of bits, spreading each of the at least one first modulated symbols using a spreading sequence that is specific to a respective first stream of bits to generate a second set of modulated symbols, mapping at least one of the second set of modulated symbols using a resource element mapping and transmitting the mapped second sets of modulated symbols as a MA signal. The spreading of each of the at least one first modulated symbols using a spreading sequence that is specific to a respective first stream of bits may use a layer specific spreading sequence and a layer specific sparsity pattern. The mapping of the at least one of the second set of modulated symbols to a resource element may use a user equipment (UE) specific and / or layer specific spreading sequence. The mapping of the at least one of the second set of modulated symbols to a resource element may use sparse spreading.

The present disclosure aims to suppress a sudden deterioration in characteristics such as the error rate of received bits while suppressing an increase in the system delay of the entire receiving device and the amount of calculation per demodulated symbol when switching the modulation method from a constant envelope modulated signal to a non-constant envelope modulated signal in order to compensate for nonlinear distortion of a modulated signal. [Solution] In this disclosure, a modulator 1 included in a transmitting device T maps a constant envelope modulated signal to multiple envelope levels and adjusts the frequency of mapping to the multiple envelope levels. Then, when a receiving device R switches between receiving a constant envelope modulated signal and a non-constant envelope modulated signal, an equalizer 3 included in the receiving device R can equally adjust the weighting coefficients of the equalization filter, thereby suppressing a sudden deterioration in characteristics such as the error rate of received bits.

A communication device for providing a channel state information, CSI, feedback in a wireless communication system includes a transceiver to receive, from a transmitter a radio signal via a time-variant, frequency-selective MIMO channel, the radio signal including downlink reference signals according to a reference signal configuration including a number of antenna ports, and downlink signals including the reference signal configuration; and a processor. The processor estimates an explicit CSI in the frequency domain using measurements on the downlink reference signals on the radio channel, selects a Doppler-delay precoder matrix (W) for a composite Doppler-delay-beam three-stage precoder, calculates either one or more of a channel quality indicator, CQI, and / or a precoder matrix indicator, PMI, and / or a rank indicator, RI, and reports to the transmitter the CSI feedback including either one or more of the CQI, and / or the PMI and / or the RI.

Embodiments of the present disclosure relate to a method for transmitting a waveform. The method comprising generating. The method comprising generating, by a transmitter, at least one of: at least one input data or control and at least one reference sequence (RS). Also, the method comprises performing spreading operation on the at least one input data or control with a spread sequence to generate at least one spread data or control sequence and time-multiplexing the at least one spread data or control sequence with the at least one RS, to generate a multiplexed sequence. Further, the method comprises generating an OTFDM symbol using the multiplexed sequence. Also, the method transmits the RS and the data or control in one OTFDM symbol, which eventually offers low PAPR, spreading gain and low latency.

A method and an apparatus for transmitting a physical layer protocol data unit (PPDU) are provided. The method includes: generating a synchronization header field based on a first sequence or a third sequence, where a side lobe of a periodic cross-correlation function of the first sequence and a second sequence is a constant value, the first sequence is a binary sequence consisting of 1 and 0, the second sequence is a binary phase shift keying sequence corresponding to the first sequence, a side lobe of a periodic autocorrelation function of the third sequence is a constant value, and the third sequence is a binary phase shift keying sequence consisting of 1 and −1; and sending the PPDU on a target channel, where the PPDU includes the synchronization header field.

The application discloses a kind of underwater acoustic communication sending control method and system, applied to the processor with multi-level storage and cache architecture.The method allocates double-buffered storage space in advance in physical storage area;Water acoustic communication data is handled to generate time domain digital signal sequence by multi-carrier digital modulation;In response to the filling completion state of data to the first buffer, cache coherency synchronization operation is performed to write the latest data in the cache of the processor back to the physical storage area;Subsequently trigger the hardware data carrying engine independent of kernel, and send data through external interface;During data carrying, fill the subsequent generated data to the idle second buffer.The application solves the problem of memory access conflict and data transmission break under high sampling rate through multi-level storage isolation and software and hardware collaborative zero-copy pipeline mechanism, and guarantees the high quality, high continuity sending of OFDM underwater acoustic signal.