145 results about "Phase rotation" patented technology

The invention relates to a channel estimation method based on frequency domain deviation compensation and dynamic DCT denoising, and belongs to the technical field of wireless communication. The method comprises the following steps: establishing a wireless channel model and an OFDM system model; estimating the frequency offset in the received signal by using the phase rotation characteristic of the pilot signal; calculating a preliminary channel frequency domain response # imgabs2 # at a pilot frequency position through a least square criterion based on the compensation signal # imgabs1 #; obtaining a receiving pilot frequency signal # imgabs4 # according to the sending pilot frequency Xp and the roughly estimated channel frequency response # imgabs3 #; estimating a current signal-to-noise ratio SNRest based on the pilot frequency signal # imgabs5 # and a noise power ratio; and establishing an adaptive DCT denoising strategy based on a signal-to-noise ratio threshold, and selecting different denoising strategies according to different signal-to-noise ratios to perform denoising processing on # imgabs6 # to obtain final channel estimation # imgabs7 #. The adaptive denoising strategy design of the invention effectively balances the relationship between noise suppression and channel structure fidelity, and improves the precision and stability of overall channel estimation.

One example includes a resonator qubit system. The system includes a resonator qubit having a first resonant frequency and an ancilla resonator having a second resonant frequency that is detuned relative to the first resonant frequency. The system also includes a tunable coupler interconnecting the resonator qubit and the ancilla resonator. The system further includes a tuning element configured to provide a tuning signal to the tunable coupler to provide a phase rotation of a quantum state of the resonator qubit based on the first and second resonant frequencies.

The radar apparatus includes: a plurality of transmission antennas that transmit a transmission signal; and a transmission circuit that applies a phase rotation amount corresponding to a Doppler shift amount and a code sequence to the transmission signal to perform multiplexing transmission of the transmission signal from the plurality of transmission antennas. A transmission delay of the transmission signal is set for a transmission period of the transmission signal. Each of the plurality of transmission antennas is associated with a combination of the Doppler shift amount and the code sequence such that at least one of the Doppler shift amount and the code sequence is different between a plurality of the combinations. A number of multiplexing by the code sequence corresponding to a first Doppler shift amount is different from a number of multiplexing by the code sequence corresponding to a second Doppler shift amount.

The radar apparatus includes: a plurality of transmission antennas that transmit a transmission signal; and a transmission circuit that applies a phase rotation amount corresponding to a Doppler shift amount and a code sequence to the transmission signal to perform multiplexing transmission of the transmission signal from the plurality of transmission antennas. A transmission delay of the transmission signal is set for a transmission period of the transmission signal. Each of the plurality of transmission antennas is associated with a combination of the Doppler shift amount and the code sequence such that at least one of the Doppler shift amount and the code sequence is different between a plurality of the combinations. A number of multiplexing by the code sequence corresponding to a first Doppler shift amount is different from a number of multiplexing by the code sequence corresponding to a second Doppler shift amount.

A method and an apparatus for transmitting or receiving an aggregated-physical layer protocol data unit (A-PPDU) in a wireless LAN system are disclosed. The method performed by a first station (STA) in a wireless LAN system, according to one embodiment of the present disclosure, may comprise the steps of: generating an A-PPDU, including a first PPDU and a second PPDU, on the basis that first phase rotation is applied to one or more fields of the first PPDU, second phase rotation is applied to one or more fields of the second PPDU, and third phase rotation is applied to one or more specific fields of the first PPDU and / or the second PPDU; and transmitting the A-PPDU to one or more second STAs.

The application provides a signal peak-to-average ratio suppression method and system, an electronic device and a storage medium. The peak-to-average ratios of transmission sequences corresponding to two factor sequences before and after flipping of a phase rotation factor of each signal block are sequentially compared, the phase rotation factor with a smaller peak-to-average ratio of the signal block is determined, and the phase rotation factor with a larger peak-to-average ratio of the signal block is no longer considered in the comparison process of subsequent signal blocks. Thus, the number of peak-to-average ratio calculations and comparisons is reduced, and the calculation complexity and calculation time are greatly reduced while ensuring a certain peak-to-average ratio suppression effect.

A radar apparatus includes three or more transmission antennas, a processor, and a memory having instructions that, when executed by the processor, cause the processor to: apply a phase rotation amount corresponding to a Doppler shift amount and a code sequence to a transmission signal, and perform multiplexing transmission of the transmission signal from the three or more transmission antennas. Each of the three or more transmission antennas is associated with each of a plurality of combinations of the Doppler shift amount and the code sequence. Each of the plurality of combinations is different at least one of the Doppler shift amount and the code sequence. Doppler shift amounts of those of the plurality of combinations which are associated respectively with at least two transmission antennas of the three or more transmission antennas are a same Doppler shift amount.

A method includes: determining a plurality of first subcarrier data items on a plurality of first subcarriers of a first frequency subband; performing first phase rotation on each first subcarrier data item based on a mixing frequency and a first reference frequency corresponding to the first frequency subband; determining a to-be-transmitted signal based on a plurality of first subcarrier data items obtained through first phase rotation; and sending the to-be-transmitted signal. In this way, phase rotation can be performed based on at least the first reference frequency, so that modulation can be correctly implemented without a need to know a mixing frequency of a receiving end. In addition, there is no need to notify the receiving end of the used mixing frequency, and the receiving end can correctly demodulate a received signal even if the receiving end does not know the mixing frequency.

The invention provides a radar apparatus, a radar signal processing method, and a radar signal processing circuit. A radar apparatus includes: a signal generation circuit that generates a baseband signal; a code generation circuit for generating a plurality of code sequences; a phase rotation circuit that adds a phase rotation based on a portion of the plurality of encoding sequences to the baseband signal and generates a plurality of encoded and multiplexed transmission signals; and a plurality of transmission antennas that respectively transmit the plurality of transmission signals. A code length of the plurality of coding sequences is greater than a coding multiplexing number for the plurality of transmission signals.

This radar device comprises a signal generation circuit for generating a baseband signal, a code generation circuit for generating a plurality of code sequences, a phase rotation circuit for applying phase rotation based on one of the code sequences from among the plurality of code sequences to the baseband signal and generating a plurality of code multiplexed transmission signals, and a plurality of transmission antennas for transmitting the plurality of transmission signals. The code length of the plurality of code sequences is greater than the code multiplexing number of the plurality of transmission signals.

A data transmission method and a communication apparatus are disclosed. The method includes: determining an aggregated physical layer protocol data unit (A-PPDU), where the A-PPDU includes at least two PPDUs belonging to different protocols, the A-PPDU includes a first sequence, the first sequence includes N segments of subsequences, any of the N segments of subsequences is obtained by performing phase rotation on a high efficiency-long training field (HE LTF) sequence and / or an extreme high throughput-long training field (EHT LTF) sequence based on a phase rotation parameter corresponding to the HE LTF sequence and / or a phase rotation parameter corresponding to the EHT LTF sequence, N phase rotation parameters corresponding to the N segments of subsequences include at least one phase rotation parameter whose value is −1, and N is a positive integer greater than or equal to 2; and sending the A-PPDU.

To provide a phase detector jig for electrically connecting a phase detector to a measurement target when measuring phase rotation of the measurement target using the phase detector, which can be easily adapted to measurement targets of various forms and enables safe and quick measurement.SOLUTION: A phase detector jig comprises a plurality of types of measurement target contact heads 1 composed of a plug-in type head to be inserted into a plurality of types of outlets and a contact-type head that can be brought into contact with terminals and conductor parts, and an adapter 2 that can be connected to a phase detector 50, where one of the plurality of types of measurement target contact heads 1 can be freely connected to and disconnected from the adapter 2.SELECTED DRAWING: Figure 1

A wireless communication method includes: generating a plurality of duplicated frequency-domain segments, wherein each of the plurality of duplicated frequency-domain segments includes a plurality of orthogonal frequency division multiplexing (OFDM) subcarrier tones; performing a phase rotation operation upon the plurality of duplicated frequency-domain segments, including applying different phase rotations to different OFDM subcarrier tones within a same duplicated frequency-domain segment; and generating an OFDM signal according to an output of the phase rotation operation.

The application relates to a low-complexity OCDM modulation and demodulation implementation method based on FPGA, and belongs to the technical field of electronic communication. The DFnT or IDFnT is split into twice rotation factor multiplication, FFT or IFFT transformation, phase and amplitude adjustment steps to realize OCDM modulation and demodulation. The IQ data module is used to input IQ data to be subjected to DFnT or IDFnT transformation; the first rotation factor multiplication module is used to multiply the first rotation factor after phase rotation with the input data; the FFT or IFFT module is used to perform FFT or IFFT transformation on the output result of the first rotation factor multiplication; then, the data is subjected to second rotation factor multiplication; finally, the phase and amplitude are adjusted to complete OCDM modulation or demodulation. The application provides an OCDM modulation and demodulation scheme based on FPGA, and the storage capacity is reduced under the condition of invariable complexity.

According to an embodiment of the present invention, proposed is an apparatus for receiving a control channel in sidelink communication, wherein the control channel is transmitted in pair with a data channel in one subframe and has a fixed size in the frequency domain, and the apparatus may comprise: a memory configured to store code for receiving the control channel; and a processor configured to execute the code to carry out operations for receiving the control channel. The operations may include: generating a reference signal for the control channel by using a first cyclic shift (CS) among a plurality of cyclic shifts (CSs); carrying out a differential correlation operation on a correlation between a reference signal for a received candidate control channel and the generated reference signal; applying phase rotation or phase correction to a result of the differential correlation operation to detect a minimum phase value and a CS corresponding to the minimum phase value; and by using the minimum phase value and a normalized power value obtained on the basis of the differential correlation operation, determining whether detection of the presence of the control channel is successful or determining a CS used for the control channel.

Disclosed herein are systems, methods, and devices for time of arrival estimation. Devices include a packet detector configured to identify a data packet included in a received signal having a symbol frequency, and a time stamping unit configured to generate an initial time stamp. Devices also include one or more processors configured to identify an estimated timing of a symbol boundary based on a time of a change in phase of the received signal estimated by using a phase rotation speed and a sample time of an IQ sample of a plurality of IQ samples to compute the time of the change in phase. The one or more processors are also configured to generate an estimated time of arrival based on the initial time stamp, the plurality of IQ samples, and the identified timing of the symbol boundary, wherein the estimated time of arrival is a corrected time of arrival.

The present invention belongs to the field of Internet of Things communications technology and discloses a narrowband Internet of Things single-carrier uplink phase rotation compensation method, device, and medium, comprising: step 1, receiving an uplink time domain signal and extracting protocol-defined phase rotation parameters; step 2, generating a time domain compensation waveform based on the phase rotation parameters; step 3, performing a conjugate multiplication operation on the received signal to complete the signal's time domain derotation; step 4, inputting the derotated time domain signal into a narrowband Internet of Things optimized phase-locked loop module for phase synchronization and demodulation to obtain a demodulation result; and step 5, observing the modulus length of the final symbol based on the demodulation result. If the modulus length is uneven, the amplitude parameter used in generating the compensation waveform in step 2 is flexibly adjusted to ensure that the modulus length of the final demodulated symbol is as uniform as possible. Compared with traditional solutions, the present invention significantly reduces the bit error rate, significantly optimizes the error vector amplitude, and reduces processing latency.

A radar apparatus includes signal generation circuitry, which, in operation, generates a plurality of transmission signals transmitted at different transmission start timings, and transmission circuitry, which, in operation, applies different phase rotations to a first transmission signal and a second transmission signal among the plurality of transmission signals and transmits the first transmission signal and the second transmission signal from different transmission antennas using code multiplexing transmission or Doppler multiplexing transmission. A part of the first transmission signal and a part of the second transmission signal are transmitted in a first period. A modulation frequency of the first transmission signal at a first timing included in the first period differs from a modulation frequency of the second transmission signal at the first timing.

A system includes an oscillator and an injection circuit coupled to the oscillator. The injection circuit includes a first injection branch coupled to a node, wherein the first injection branch is configured to receive a first clock signal and generate a first injection current based on the first clock signal. The injection circuit also includes a second injection branch coupled to the node, wherein the second injection branch is configured to receive a second clock signal and generate a second injection current based on the second clock signal, and wherein the first injection current and the second injection current are combined at the node.

A reference signal sending method includes obtaining a frequency-domain cyclic shift factor and a time-domain cyclic shift factor, wherein the frequency-domain cyclic shift factor and the time-domain cyclic shift factor are useable to perform phase rotation on a reference signal sequence. A reference signal sending method further includes generating a second reference signal sequence based on a first reference signal sequence, the frequency-domain cyclic shift factor, and the time-domain cyclic shift factor. A reference signal sending method further includes sending the second reference signal sequence on an antenna port p, wherein p is an element in a set {0, 1, . . . , P−1}, and P is an integer greater than or equal to 1.

A method and an apparatus for transmitting an EHT PPDU to a WLAN system are proposed. Specifically, a transmitter generates and transmits an EHT PPDU to a receiver through a 320 MHz band from which an 80 MHz band is punctured. The EHT PPDU includes a legacy preamble and an EHT field. The legacy preamble includes an L-STF and an L-LTF. The legacy preamble is generated by applying a first phase rotation value. The first phase rotation value is obtained on the basis of a second phase rotation value and a third phase rotation value. The second phase rotation value is a phase rotation value that repeats a phase rotation value defined for the 80 MHz band in an 802.11ax system. The third phase rotation value is a phase rotation value defined in unit of the 80 MHz band in the 320 MHz band on the basis of an optimal PAPR of the L-STF and L-LTF. The first phase rotation value is [1 1 −1 −1 −j −j j j 1 1 −1 −1 −j −j j j].

The invention discloses a multi-beam parallax hierarchical modulation multiple access method, which comprises the following steps that: a transmitting end splits bit data after channel coding of each user into a shared part and a private part according to the actual channel condition of each user; the transmitting end performs phase rotation pre-coding on the constellation points and then transmits the constellation points in an overlapped manner, so that the constellation points at the receiving end are aligned in phase The receiving end calculates an equivalent channel coefficient and a receiving end constellation diagram Euclidean distance parameter based on the receiving end channel state information, and performs primary equalization and I / Q path separation processing on a received signal; and a receiving end decodes the bit streams distributed in the shared layer and all the bit streams in the private layer, and after the log-likelihood ratios of all the bit streams are calculated, the log-likelihood ratios are sent to a channel decoder to be recovered to obtain the bit data of each user source. According to the method, a user does not need to perform serial interference cancellation in some working modes, interference of shared part data to private part data can be avoided, and a relatively high user rate is realized.

The application discloses a non-orthogonal chirp multicarrier transmission method based on subcarrier interval compression, and belongs to the technical field of wireless communication.The application aims to solve the problem of poor bit error rate performance caused by subcarrier interval interference existing in the prior SEFDM system.The SECDM system based on DFT and phase rotation is established, the chirp subcarrier interval in the orthogonal chirp subcarrier division multiplexing signal is reduced, the distance between the subcarriers in the orthogonal chirp subcarrier division multiplexing system is further compressed, and the transmission rate and the spectral efficiency are improved.The SECDM system of the application replaces the sine and cosine carrier with the chirp carrier, follows the characteristics of the chirp subcarrier, can reduce the influence of ICI under the condition of the same spectral efficiency, and therefore has more superior bit error rate performance than the SEFDM system.The method of the application can be applied to the technical field of wireless communication.

The invention provides a modulation method, a communication node and a storage medium. The modulation method comprises the following steps: modulating a first data sequence to obtain a second data sequence; and for every two adjacent elements of the second data sequence, respectively obtaining a real number item of one element and an imaginary number item of the other element, carrying out addition and phase rotation operation on the real number item and the imaginary number item, and inserting data obtained by the addition and phase rotation operation between the two adjacent elements, and obtaining a third data sequence.

A transmission device (10) for orthogonal frequency division multiplexing communication includes a subcarrier mapping section (113) that copies a subcarrier signal sequence and maps the copied subcarrier signal sequences at equal subcarrier intervals, and a transmission phase rotation section (114) that divides each of the subcarrier signal sequences mapped at the subcarrier intervals into two or more subsets and imparts a phase rotation that makes each of the subsets a different time timing to each of the subsets.

A radar transmitter includes: a plurality of transmission antennas that transmit a transmission signal; and a transmission circuit that applies a phase rotation amount corresponding to a Doppler shift amount and a code sequence to the transmission signal to perform multiplexing transmission of the transmission signal from the plurality of transmission antennas. Each of the plurality of transmission antennas is associated with each of a plurality of combinations of the Doppler shift amount and the code sequence. Each of the plurality of combination is different at least one of the Doppler shift amount and the code sequence, and the Doppler shift amounts of those of the plurality of combinations which are associated respectively with at least two transmission antennas of the plurality of transmission antennas are the same Doppler shift amount, the at least two transmission antennas being a first sub-array antenna.

A processor of this radar system is configured to cause an encoded transmitted signal to be transmitted from individual transmission antennas within overlapping transmission periods in a compensation transmission cycle preceding a measurement transmission cycle. The encoding is defined by a line pertaining to an additional phase for adding a phase shift amount that is an integral multiple of a rotation amount, the phase shift amount being the same within the rotation period of a velocity phase and being random for each rotation period. The processor is configured to acquire a phase offset component correlated with a plurality of decoded signals in a compensation reception cycle. The decoded signals result from a plurality of signal components that correspond to individual chirp signals within the rotation periods being decoded by rearrangement into a phase rotation order shared among the rotation periods. The processor is configured to output sensing data correlated with a received signal from which the phase offset component has been removed.

Provided are a wireless communication method and a communication device. The method comprises: a first device sending a first PPDU, wherein a data field of the first PPDU is carried by means of a plurality of frequency domain portions, the plurality of frequency domain portions comprise repeated data, and the repeated data is mapped to the plurality of frequency domain portions via phase rotation. In the present application, repeated data is mapped to a plurality of frequency domain portions via phase rotation. The phase rotation can reduce the PAPR caused by periodicity resulting from frequency domain duplication.

The invention belongs to the technical field of power system synchronization, and particularly relates to a three-phase phase-locked loop control method and device. The method comprises the following steps: acquiring a q-axis power grid voltage sampling value of a three-phase power grid voltage sampling value under a two-phase rotating coordinate system; inputting the q-axis power grid voltage sampling value into a complex coefficient filtering sliding mode observer, extracting alternating current frequency multiplication disturbance brought by the distorted power grid voltage, and obtaining a q-axis voltage estimated value, a direct current estimated value in the alternating current frequency multiplication disturbance and a total alternating current estimated value in the alternating current frequency multiplication disturbance; the complex coefficient filtering sliding-mode observer is obtained by connecting a complex number filtering item of a complex coefficient filter in parallel in the sliding-mode observer; and calculating a phase angle estimation value of the three-phase phase-locked loop after feedback compensation based on the q-axis voltage estimation value, the direct current quantity estimation value in the alternating current frequency multiplication disturbance, the total alternating current quantity estimation value in the alternating current frequency multiplication disturbance and the power grid phase voltage amplitude. The control efficiency and accuracy of the phase-locked loop are improved, and the method has good stability and robustness.

Provided are a wireless communication method and a communication device. The method comprises: a first device sending a first PPDU, wherein a data field of the first PPDU is carried by means of a plurality of frequency domain portions, the plurality of frequency domain portions comprise repeated data, and the repeated data is mapped to the plurality of frequency domain portions via phase rotation. In the present application, repeated data is mapped to a plurality of frequency domain portions via phase rotation. The phase rotation can reduce the PAPR caused by periodicity resulting from frequency domain duplication.