796results about "Frequency-modulated carrier systems" patented technology

Various embodiments herein provide techniques related to transmission of a wake-up signal (WUS) from a base station to a user equipment (UE). In embodiments, the WUS may be received by a wake-up receiver (WUR) of the UE. Based on reception of the WUS, a main receiver of the UE may exit from a deep-sleep state or an off state. Other embodiments may be described and / or claimed.

The invention discloses a time-frequency synchronization tracking and judging method based on GFSK (Gaussian Frequency Shift Keying). The method comprises the following steps: S1, positioning the initial position of a synchronization word by detecting a lead code; s2, extracting a fixed synchronization word, completing frame synchronization based on correlation matching, and positioning a starting point of an effective data segment; s3, a range cycle counter collects a central sampling point and two adjacent sampling points to form a candidate sampling point sequence; s4, dynamically and finely adjusting the range cycle counter to form a time sequence calibration sampling point sequence; s5, performing phase difference calculation on the time sequence calibration sampling point sequence, estimating continuous frequency offset and generating a compensation value; s6, applying the compensation value to construct a decision feedback equalizer with delay front and back terms; s7, performing interference suppression on the compensation sampling point sequence by using a decision feedback equalizer with delay front and back items, and outputting a soft decision value; and S8, executing three times of judgment, constructing a sliding reference sequence, and outputting a final bit judgment result. According to the method, the problem of poor GFSK demodulation robustness under Doppler disturbance is solved.

A method of decoding a received communication signal is provided. The method may comprising converting the received communication signal to the frequency domain to provide frequency domain data. The method may further comprise combining amplitudes of one or more selected frequency components of the frequency domain data, the one or more frequency components being selected according to a predefined communication symbol comprising one or more selected frequency tones corresponding to the one or more selected frequency components. The method may further comprise detecting the predefined communication symbol in the received communication signal depending on the combined amplitudes of the one or more selected frequency components of the frequency domain data.

The invention provides a visual underwater sensor network simulation method, and relates to the technical field of underwater sensor networks, and the method comprises the steps: configuring network simulation parameters which comprise topological structure parameters, channel parameters and simulation parameters; inputting the channel parameters into an underwater acoustic calculation tool to generate an underwater acoustic multipath channel for simulation; the bit error rate BER of the multi-carrier MFSK underwater acoustic communication algorithm under the underwater acoustic multipath channel condition is calculated, and the bit error rate BER is input into the OTcl script; performing network simulation on the configured OTcl script by using an underwater network simulator; and displaying a network simulation result through a visual interface. The underwater sensor network simulation result can be displayed through the visual interface, the defect that current NS2-based underwater sensor network simulation software does not have a visual interface is overcome, a good man-machine interaction interface can be provided for a user, the development efficiency is improved, and the user is helped to better evaluate the performance of the underwater sensor network.

Techniques and apparatuses are described that facilitate ambient computing using a radar system. Compared to other smart devices that rely on a physical user interface, a smart device with a radar system can support ambient computing by providing an eye-free interaction and less cognitively demanding gesture-based user interface. The radar system can be designed to address a variety of challenges associated with ambient computing, including power consumption, environmental variations, background noise, size, and user privacy. The radar system uses an ambient-computing machine-learned module to quickly recognize gestures performed by a user up to at least two meters away. The ambient-computing machine-learned module is trained to filter background noise and have a sufficiently low false positive rate to enhance the user experience.

A modulation signal processing apparatus and method is provided. The apparatus is applied to a microcontroller unit. The apparatus includes a first signal processing module and a second signal processing module. The first signal processing module is connected to an analog-to-digital converter of the microcontroller unit, and used for receiving a completion mark output by the converter, collecting a conversion value output by the converter, and generating corresponding bit data according to a total number of sampling times and a preset half-cycle value. The second signal processing module is connected to a PWM output timer of the microcontroller unit, and used for converting the bit data into a modulation data packet that complies with a Qi protocol, and respectively calculating a reload value of the PWM output timer and a corresponding frequency modulation parameter according to the modulation data packet and a preset modulation configuration parameter.

The invention provides an anti-interference phase estimation method suitable for MSK modulation, which belongs to the technical field of anti-interference phase estimation and comprises the following steps: S1, an interference identification and marking step which comprises a signal capturing and hopping link, an interference detection algorithm link and an interference mask generation link; s2, an interference range judgment and processing step, wherein the step comprises a whole-hop interfered processing link, a partial interference processing link, a pilot frequency sequence reconstruction link and a phase estimation and compensation link; and S3, a data integration and post-processing step, wherein the step comprises a demodulation link, a data splicing link, a de-interleaving processing link, a channel decoding link and a performance feedback link. In order to solve the problems that the coding gain of a decoder is reduced and the communication performance is influenced by a traditional method when short-time sudden interference occurs in communication, the phase can still be effectively estimated by using data which are not interfered through the characteristics of MSK modulation, so that the data which are not interfered can participate in subsequent demodulation and decoding, and the communication performance is improved. And the anti-interference capability of the system is effectively improved.

The invention discloses a distribution network power line anti-interference communication method based on adaptive filtering, and belongs to the technical field of distribution network power line communication. According to the method, a communication signal adopting a frequency shift keying modulation mode is acquired from a power line coupler of a distribution network through a signal acquisition module, the communication signal is preprocessed by using a digital signal processing unit, spectral analysis is performed on the preprocessed signal, and characteristic parameters of interference noise are extracted; a coefficient vector of a finite impulse response adaptive filter is initialized based on the characteristic parameters, the order of the filter is in direct proportion to the reciprocal of the dominant interference frequency, fine adjustment is carried out based on noise energy distribution through a table look-up method or a linear mapping relation, and the weight coefficient of the filter is adjusted in real time in the communication process. The adjustment step length is dynamically adjusted according to the real-time estimated signal-to-noise ratio, and finally, the processed signal is output through the adaptive filter and data demodulation is carried out. The method is mainly used for improving the anti-interference capability and the communication reliability of the power private line communication of the distribution network.

A device for transmission of wireless power according to an embodiment of the present specification comprises: a power conversion circuit for transmitting the wireless power to a wireless power receiving device; and a communication / control circuit for communicating with the wireless power receiving device and controlling the wireless power, wherein the communication / control circuit transmits a response to a reception data packet received from the wireless power receiving device or a transmission data packet transmitted to the wireless power receiving device on the basis of a timeout period, and the timeout period is changed according to a communication speed between the communication / control circuit and the wireless power receiving device.

The invention provides a target tracking method and device, a storage medium and a program product, and relates to the technical field of network communication. The method comprises the following steps: processing a LoRa signal received by each gateway by using a linear frequency modulation symbol to obtain a multi-channel demodulation symbol; for each gateway, based on multichannel demodulation symbols, symbol-level features corresponding to peak symbols in each channel are extracted, and a signal receiving matrix is formed; according to the signal receiving matrix, obtaining an angle of arrival from the LoRa signal to a gateway receiving the LoRa signal; predicting a target position based on the arrival angles corresponding to the plurality of gateways; and obtaining a target track according to the plurality of target positions in the preset time period.

Provided are a data transmission circuit system and a data reception circuit system, which use an edge of a pulse signal. The data transmission circuit system modulates a digital signal by using time levels determined by time differences between rising edges (or falling edges) of a clock pulse signal and rising edges (or falling edges) of a data pulse signal. The data reception circuit system demodulates a digital signal by using time levels determined by time differences between rising edges (or falling edges) of a recovered clock pulse signal and rising edges (or falling edges) of a data pulse signal.

The invention belongs to the technical field of communication, and particularly relates to a high-robustness multi-channel frequency shift Chirp modulation signal generation method and system for a time-frequency doubly selective channel. The method comprises the following steps of: 1, calculating robust code digits based on statistical characteristics of time delay and Doppler frequency shift of an ionized layer channel; 2, based on the number of robust code bits in the step 1, setting an address code, and realizing RO-MFSCM signal mapping of binary information bits; 3, modulating and transmitting the RO-MFSCM signal based on the information mapping in the step 2, thereby realizing the transmitting process of the RO-MFSCM signal; step 4, based on the emission signal in the step 3 and the robust code digit in the step 1, the receiver carries out robust domain energy aggregation on the RO-MFSCM signal; and step 5, based on the multi-channel robust domain energy aggregation signal in the step 4, adopting a multi-channel parallel demodulation algorithm and de-mapping to realize the receiving process of the RO-MFSCM signal under the time-frequency doubly selective channel. The method aims at the transmission fading problem of the FSCM signal in the ionosphere time-frequency doubly selective channel.

Disclosed are systems and techniques for wireless joint communications and sensing. For example, a network device can receive, from a network entity, at least one configuration signal indicating at least one configuration comprising a resource for a physical uplink control channel (PUCCH) and for sensing. The network device can output, for transmission to the network entity, the PUCCH based on the at least one configuration comprising the resource. The network device can transmit a sensing signal based on the at least one configuration comprising the resource.

Aspects of the present disclosure provide techniques and apparatus for multi-phase frequency modulation. An example method of multi-phase frequency modulation includes determining a phase of a transmit signal based on constellation points; determining a code for frequency modulation based on the phase; generating a plurality of oscillation signals having different phases; efficiently phase-modulating the plurality of oscillating signals having the different phases based on the encoding for the frequency modulation; and selecting one of the plurality of phase-modulated oscillating signals.

A transmit apparatus comprising a scaler arranged to scale a frequency deviation signal associated with a frequency shift keying signal (FSK) by a scale factor and a limiter arranged to limit frequency deviations of the scaled frequency deviation signal after a filtering. A power spectral density, phase trajectory, and frequency deviation of an FSK signal based on the limited scaled frequency deviation tracks similar criteria of a minimum phase shift keying (MSK) signal.

Embodiments of the present disclosure provides a method for wireless communication and an apparatus, which can enable paging for ambient internet of things (IoT) devices. The method for wireless communication includes receiving, by a first communication device, a paging message. Optionally, the first communication device is an ambient IoT device or a zero-power device.

The invention provides a position state interaction method and system between interphones and related equipment, and the method comprises the steps: obtaining the first position state information of a local interphone in response to a position information updating request of networking equipment; modulating the first position state information, and transmitting the modulated first position state information to a surrounding networking interphone through radio frequency; receiving a radio frequency signal containing second position state information fed back by the surrounding networking interphone based on the automatic position return system; and generating an equipment list and a relative position map of the local interphone and the surrounding interphones in a first interface of the local interphone based on the first position state information and the second position state information. According to the technical scheme, the positions of the interphones can be automatically exchanged through the automatic position return system, the equipment and the positions of the interphones around can be displayed on the first interface of the interphone, and the technical problem that position interaction between the interphones can only be performed through voice communication and is very inconvenient is solved.

The invention discloses a low-complexity MSK coded modulation system phase synchronization receiving system and method, and relates to the technical field of continuous phase modulation. On one hand, an original message is coded and modulated by constructing a pre-coding mode, a receiving end realizes optimal sampling point extraction at the minimum intersymbol crosstalk moment after phase decoupling frequency conversion processing, MSK is converted into BPSK-like modulation, oversampling processing is not needed, modulation phase components of a receiving synchronization section can be offset, and the modulation efficiency of the receiving synchronization section is improved; therefore, accurate estimation of Doppler phase and frequency is realized, and the anti-Doppler capability is improved. On the other hand, coherent demodulation soft information is directly output after the real part of the signal subjected to Doppler frequency offset and phase offset compensation is obtained, the complexity of the demodulation algorithm is low, the performance of the demodulation algorithm is equivalent to that of BPSK, the demodulation algorithm is remarkably superior to that of an MSK optimal demodulation receiver in a low signal-to-noise ratio region, and the demodulation algorithm is particularly suitable for a bit interleaving coding modulation system combined with channel coding and has a wide application prospect. And reliable transmission under a low signal-to-noise ratio can be realized.

The invention relates to the transmission and reception of non-binary error correcting code words. The transmission method includes a first modulation (56) which implements a set of q sequences comprising q−1 sequences of q−1 chips, each sequence being obtained by circular shifting of a basic pseudo-random sequence, and a partially invariant sequence, invariant to a predetermined subset of circular shifts. The first modulation (56) further implements an association between each code word symbol and a sequence of the set of sequences wherein said finite field GFq has a non-zero primitive element, the symbol zero being associated with said partially invariant sequence and a symbol equal to a power j of the primitive element, j being an integer comprised between 0 and q−2, being associated with a pseudo-random sequence determined by j circular shifts of the basic pseudo-random sequence.

The invention relates to the technical field of communication, and discloses an AI-based adaptive data encryption method and system, and the method comprises the steps: carrying out the frequency domain transformation analysis of an original data flow, and generating a spectrum distribution feature set; the carrier frequencies are screened through a dynamic frequency selection algorithm to obtain an optimal carrier frequency range; performing phase modulation on the data bit stream, and embedding the data bit stream into a subcarrier in an optimal carrier frequency range to generate a first encrypted data stream; when the interference intensity exceeds an interference threshold value, performing directional adjustment on a frequency deviation parameter according to an interference type, and generating a second encrypted data stream; dynamically adjusting the frequency distribution parameters according to the transmission distance data to obtain a frequency distribution parameter set; and performing adaptive modulation and spectrum shaping on the second encrypted data stream based on the frequency distribution parameter set, and outputting a hidden transmission data stream. The method has the following effect that the data hidden transmission capability and the receiving and restoring accuracy in a complex environment can be improved.

Communication systems and methods in accordance with various embodiments of the invention utilize modulation on zeros. Carrier frequency offsets (CFO) can result in an unknown rotation of all zeros of a received signal's z-transform. Therefore, a binary MOCZ scheme (BMOCZ) can be utilized in which the modulated binary data is encoded using a cycling register code (e.g. CPC or ACPC), enabling receivers to determine cyclic shifts in the BMOCZ symbol remitting from a CFO. Receivers in accordance with several embodiments of the invention include decoders capable of decoding information bits from received discrete-time baseband signals by: estimating a timing offset for the received signal; determining a plurality of zeros of a z-transform of the received symbol; identifying zeros from the plurality of zeros that encode received bits by correcting fractional rotations resulting from the CFO; and decoding information bits based upon the received bits using a cycling register code.

A communication method and device relate to the field of communication. In the method, an uplink wake-up signal is sent, the uplink wake-up signal is used for waking up a first cell, the uplink wake-up signal carries first indication information, the first indication information indicates an expected period of a synchronous broadcast block of the first cell and / or a beam of the synchronous broadcast block, and the synchronous broadcast block of the first cell and / or a system information block are / is monitored. By adopting the method, the first cell can be awakened, and the requirements of the terminal equipment can be better met.

The invention discloses a double-index modulation simulated radio frequency division multiplexing (AFDM) communication method. The method comprises the following steps: step 1, a transmitting end performs serial-parallel change; step 2, obtaining a transmission signal according to the index position of the joint selection AFDM activation subcarrier in the mapping table, the modulation bit mapping and the pre-chirp parameter of the activation subcarrier; step 3, obtaining a time domain signal; 4, performing parallel-serial conversion on the time domain signal; step 5, performing propagation transmission through a time-varying channel based on the time domain signal; step 6, constructing a time domain channel matrix, and performing serial-to-parallel conversion on the time domain receiving signal to obtain a receiving signal; step 7, performing channel estimation on the chirp parameter equivalent channel matrix; step 8, detecting an activated subcarrier position, an activated subcarrier modulation bit and an activated subcarrier pre-chirp parameter based on the chirp parameter equivalent channel matrix, and performing pre-chirp parameter transformation; and step 9, recovering the bit stream through parallel-serial change. The spectrum efficiency of the AFDM system is further improved, and the bit error rate is reduced.

A network entity for a wireless communication network is described. The network entity has a plurality of antennas or an antenna array including a plurality of antenna elements. The network entity is configured to control the plurality of antennas or the antenna array to form a plurality of beams and to concurrently transmit and receive on the plurality of beams, the plurality of beams including at least a first beam and a second beam. The network entity is a first network entity configured to communicate with one or more second network entities of the wireless communication network. The network entity is configured to sense a surrounding of the network entity using a reflection of a radio signal. The network entity is configured to transmit the radio signal on the first beam which is directed into a first direction. The network entity is configured to direct the second beam into a second direction, the second direction pointing towards a reflector, the reflector receiving from the surrounding the reflection of the radio signal and directing the reflection of the radio signal towards the network entity. The first direction into which the first beam is directed is different from the second direction into which the second beam is directed.

The invention discloses a transmission type communication system and method based on low-frequency carrier waves and high-frequency modulation. The transmission type communication system and method are suitable for complex medium environments such as deep sea, strata and biological tissues. Aiming at the contradiction that the traditional low-frequency communication bandwidth is insufficient and the high-frequency communication penetrating power is poor, according to the scheme, a low-frequency carrier wave (30Hz-100kHz) and a high-frequency modulation signal (such as OFDM (Orthogonal Frequency Division Multiplexing) and 256QAM (Quadrature Amplitude Modulation)) are fused through a nonlinear signal superposition technology to generate a composite carrier wave signal, long-distance penetration is realized by utilizing the low attenuation characteristic of the low-frequency carrier wave, and meanwhile, the data rate is improved through high-frequency modulation. Application scenes comprise deep sea detection (300-meter high-definition video return), a brain-computer interface (implantable antenna transmission neural signal) and an intelligent power grid (underground pipe network monitoring). Through the physical layer-information layer collaborative design, the physical boundary limitation of traditional communication is broken through, and high penetrability, high bandwidth and strong anti-interference capability are achieved.

The invention discloses a frequency division multiplexing RFID tag signal parallel receiving method based on an SIC architecture, which comprises the following steps: firstly, constructing a frequency division multiplexing UHF RFID system, performing subcarrier modulation on respective Miller codes by tags by using M values of 4, 8, 12 and 16, deducing the power spectrum density of a Miller subcarrier modulation sequence based on the Wiener-Singqin theorem, and finally, performing frequency division multiplexing on the Miller subcarrier modulation sequence according to the power spectrum density of the Miller subcarrier modulation sequence. The method comprises the following steps of: quantitatively analyzing the interference degree generated by tags of other channels in different frequency channels, performing power estimation through FFT (Fast Fourier Transform), estimating the amplitude and radio frequency phase of each tag by utilizing the known interference degree, calculating the SIR (Signal to Interference Ratio) of each tag, sequencing, and demodulating in sequence according to the SIR size until the last tag signal is demodulated. According to the method provided by the invention, the parallel receiving of the frequency division multiplexing RFID tags can be realized, so that the reader-writer can simultaneously inventory a plurality of tags in a single time slot, thereby effectively improving the identification efficiency and throughput rate of the UHF RFID system, and improving the ability of the UHF RFID system to adapt to application scenarios in which massive tags need to be quickly accessed in a large-scale Internet of Things.

The invention discloses a detection and recognition integrated waveform design method, device and equipment, a medium and a product. The method comprises the following steps: dividing the time length of a waveform according to a time element, a time frame and a time slot structure; for each time slot, a time slot waveform frame structure is set to be composed of a jitter segment, a synchronization segment and a data segment, and the data segment comprises a Gaussian minimum shift keying (GMSK) modulation data segment and a linear frequency modulation (LFM) modulation data segment; respectively setting a GMSK modulation signal parameter and an LFM modulation signal parameter according to communication system demand information; performing pseudo-random hopping design on the pulse frequencies of the synchronization segment and the GMSK modulation data segment to obtain a pseudo-random frequency hopping pattern; and generating a GMSK modulation section waveform and an LFM modulation section waveform according to the GMSK modulation signal parameter and the LFM modulation signal parameter so as to form an integrated waveform. According to the embodiment of the invention, the integrated waveform can realize communication, detection and identification functions at the same time, the waveform resource utilization rate is high, and the anti-interference capability is relatively high.

Methods, systems, and devices for wireless communication are described. A passive user equipment (UE) may transmit an indication of a baseband frequency shift type supported by the passive UE for backscatter communications. The baseband frequency shift type may include one or both of a single-side frequency shift or a double-side frequency shift. A network entity may determine a frequency domain resource allocation (FDRA) for the passive UE based on receiving the indication. The network entity may transmit an indication of the FDRA to the passive UE. The FDRA may correspond to the baseband frequency shift type supported by the passive UE. The passive UE may transmit one or more backscatter communications based on the FDRA signaled by the network entity. The one or more backscatter communication s may be frequency shifted according to the baseband frequency shift type supported by the passive UE.

The invention relates to a GMSK signal incoherent demodulation method and device. The method comprises the following steps: obtaining a state grid chart by utilizing multi-symbol detection; obtaining a matched filter according to the state grid chart; enabling the received baseband signal to pass through a matched filter to obtain a signal correlation value; obtaining a branch metric value of each state node in the baseband signal according to the signal correlation value; updating the path metric value of each state node according to the branch metric value; reserving a path corresponding to the maximum path metric value of each state node, and taking the path as a surviving path of each state node; and backtracking the survival path of each state node to obtain demodulation data of the baseband signal. According to the method provided by the invention, the state grid is obtained through multi-symbol detection, and multiple pieces of symbol information are combined, so that the problem of insufficient memory length in related technologies is solved, errors are prevented from spreading along the grid, and the error probability of symbol judgment during demodulation is reduced.

The invention provides a multi-input multi-output permutation index differential chaos shift keying communication system and method, and relates to the technical field of chaos secret communication. Generating two paths of chaotic signals in the modulator, wherein one path is used as a reference signal; delaying the other path, performing mapping permutation by using the index bit, multiplying the modulation bit subjected to space-time coding by a reference signal copy generated by permutation, generating an information signal, combining the information signal with the reference signal, and sending the information signal to a demodulator; and the demodulator is used for respectively delaying and replacing the received transmission signal, carrying out correlation operation on the delayed receiving signal and the replaced receiving signal to obtain an output signal, and carrying out comparative judgment and space-time decoding to recover the index bit and the modulation bit. According to the method disclosed by the invention, the security and the information transmission rate of a communication system are improved through different index bit mapping selection permutation rule methods; and channel fading and noise are suppressed by using multiple antennas, so that the bit error rate performance of a communication system is effectively improved.