17 results about "Phase rotation" patented technology

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.

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.

The application discloses a dynamic interference suppression method of multipath channel phase focusing and harmonic reverse phase cancellation, relates to the technical field of interference suppression, and comprises a path characteristic extraction module, which extracts sampling data of a received signal, constructs a received signal matrix, generates a pilot signal, carries out filter processing on a noise matrix, calculates a channel frequency response matrix, and extracts path characteristics by using a peak value detection method. The method can comprehensively calculate the time delay component contribution of the channel time domain response by discretizing the channel frequency response matrix through limited sampling points and combining all frequency components in the frequency bandwidth, can enhance the dynamic response capability of the channel model by introducing time-varying environmental characteristics through a dynamic path time delay function, can improve the signal characteristic correction precision through dynamic compensation of path time delay error phase rotation, and can realize the channel description process with path grouping as the core.

In a 1X speed 2N-phase VR resolver, 2N coil-poles are evenly distributed around the stator, N being an integer not smaller than three. A primary coil and sine and cosine signal sensing coils are wound at each coil-pole. All primary coils are wound with the same number of turns, with their winding polarities alternating across the coil-poles. The number of turns and winding polarities for the sine and cosine signal sensing coils at the coil-pole position n (1≤n≤2N) are determined by the sine and cosine synthesis coefficients at position n of the 2N-phase cosine-ZF transform. The coil turns ratios between the sine and cosine signal sensing coils relative to the primary coil are determined by the absolute values of the coefficients, whereas the winding polarities are dictated by signs of the synthesis coefficients and directions of the corresponding primary coils. Considering the sensitivity to misalignment and eccentricity associated with a 1X sinusoidal rotor lobe, a 1X quasi-square-waveform rotor lobe provides a more practical and advantageous alternative.

The application relates to the field of satellite communication and discloses a satellite communication anti-interference transmission system, which comprises a phase rotation compensation module for removing Doppler frequency shift components; a channel state sensing unit for calculating an error vector magnitude variation gradient of pilot symbols; a transmission strategy control unit for generating a transmission reconstruction pulse when the variation gradient exceeds a slope threshold value; and a physical layer framing unit for truncating a physical layer long frame in response to the transmission reconstruction pulse, dividing residual service data into independent microframes, and reducing modulation order. The application uses a channel state variation gradient to capture interference energy injection characteristics, compresses a transmission strategy reconstruction response delay, effectively reduces data loss caused by transient error codes, and guarantees the physical continuity of a key data link in an electromagnetic countermeasure environment.

The application belongs to the technical field of wireless communication and terminal, and relates to a signal generation method, device, communication, system storage medium and electronic equipment. The method comprises the following steps: generating a first binary keying signal OOK waveform based on a low-power wake-up LP-WUS signal; and performing phase rotation on the first OOK waveform by using a sequence containing a plurality of phase rotation factors with the same modulus and a preset rule of phase change, so as to obtain a phase-rotated OOK waveform. According to the application, the frequency diversity gain of the LP-WUS signal is improved by performing phase rotation on the time-domain signal corresponding to the LP-WUS signal, so that the LP-WUS signal has strong anti-fading capability, and the detection rate and detection accuracy of the LP-WUS signal are improved.

A method and a device for receiving a PPDU in a wireless LAN system are presented. Specifically, a receiving STA receives a PPDU from a transmitting STA through a broadband and decodes the PPDU. The PPDU includes a legacy preamble and first and second signal fields. The legacy preamble and the first and second signal fields are generated on the basis of a first phase rotation value. When the broadband is a 320 MHz band, the first phase rotation value is [1 1 1 −1 1 1 1 −1 −1 −1 −1 1 −1 −1 1 −1].

The present application belongs to the field of microelectronic technology and coherent optical communication technology, and specifically relates to a low-delay high-throughput phase offset recovery circuit. The phase offset recovery circuit supports the processing of QPSK signals and 16QAM signals. The circuit structure comprises a phase rotation module, a multi-mode decision module, a partial error module, a final error module and a phase output module. The circuit completely performs calculation in the Cartesian coordinate, avoids the use of ordinary multipliers by using constant coefficient multiplication accumulators and square lookup tables, reduces the circuit size, and divides the error signal calculation into partial error and final error to reduce the calculation complexity. The output of the phase recovery value uses the data between adjacent clock cycles to reduce the delay and improve the recovery accuracy. The present application meets the accuracy and precision requirements of the carrier phase recovery of modern long-distance coherent optical communication, provides multi-format support and very small phase recovery calculation delay, and maintains a small circuit size.

The present application relates to a method for suppressing far sidelobe bulge of a phased array, comprising the following steps: S100: setting a phase rotation granularity of a phased array to 2x2, and measuring a residual phase percentage of the phased array; S200: determining a phase rotation granularity of the phased array that meets an index requirement according to the residual phase percentage of the phased array and a pre-given far sidelobe bulge index; S300: dividing the phased array into a plurality of sub-arrays according to the phase rotation granularity that meets the index requirement, and determining a rotation phase of each sub-array; S400: applying the determined rotation phase to each sub-array of the phased array. The method for suppressing far sidelobe bulge of a phased array can significantly improve far sidelobe bulge, thereby improving communication performance.

This application provides a motor control method and a motor control circuit. The motor control method includes: acquiring the d-axis voltage and q-axis voltage of the motor in a two-phase rotating coordinate system; if the motor rotor is in a low modulation region and the q-axis voltage is within a set prohibited range of the q-axis region, optimizing the q-axis voltage to generate an optimized q-axis voltage, the optimized q-axis voltage being equal to the boundary value of the prohibited range of the q-axis region with the same positive and negative sign as the q-axis voltage, the boundary value including an upper boundary value and a lower boundary value; and generating a PWM pulse signal for controlling the motor based on the d-axis voltage and the optimized q-axis voltage. By increasing the absolute value of the q-axis voltage, which is relatively small when the motor rotor is in the low modulation region, the width of the generated PWM pulse signal can be increased, thereby satisfying the minimum time window for current sampling, avoiding motor start-up failure or abnormal stop, and improving the stability of motor operation.

The application relates to the field of satellite communication and discloses a satellite communication anti-interference transmission system, which comprises a phase rotation compensation module for removing Doppler frequency shift components; a channel state sensing unit for calculating an error vector magnitude variation gradient of pilot symbols; a transmission strategy control unit for generating a transmission reconstruction pulse when the variation gradient exceeds a slope threshold value; and a physical layer framing unit for truncating a physical layer long frame in response to the transmission reconstruction pulse, dividing residual service data into independent microframes, and reducing modulation order. The application uses a channel state variation gradient to capture interference energy injection characteristics, compresses a transmission strategy reconstruction response delay, effectively reduces data loss caused by transient error codes, and guarantees the physical continuity of a key data link in an electromagnetic countermeasure environment.

A clustering unit (S120) clusters rays using ray information and basic information, which is information used to calculate the ray information. A phase addition unit (S150) calculates, for each ray, a phase rotation amount at a reception point calculated from the path length of a propagation path, and calculates a complex propagation loss, which is a propagation loss represented by a complex value with the phase rotation amount taken into account. A cluster information generation unit (S140, S160 to S170) sums the complex propagation losses of rays belonging to the same cluster for each cluster generated by the clustering unit, and sets the summed result as the total propagation loss and phase of an integrated ray obtained by integrating all rays belonging to the cluster.

Disclosed in the present invention is a method for reducing the PAPR of a multi-carrier faster-than-Nyquist system, comprising: sequentially performing coding, interleaving, constellation mapping, and serial-to-parallel conversion on a source sequence to obtain K subsequences; sequentially performing upsampling and pulse shaping on the K subsequences; modulating K shaped signal sequences onto K different subcarriers, and using different first phase rotation components to rotate a symbol sequence on each subcarrier by an initial phase to obtain K subcarrier signals; dividing the K subcarrier signals into U groups, multiplying a u-th (u=1, 2, ..., U) group of subcarrier signals by a corresponding second phase rotation component, respectively, and then superimposing all the subcarrier signals to obtain a signal having a reduced PAPR; and performing peak clipping processing on the signal having the reduced PAPR to obtain a signal having a further reduced PAPR. The present invention can effectively reduce the PAPR of a multi-carrier faster-than-Nyquist system and reduce system performance loss.

This invention provides a radar device, a radar signal generating device, and a radar signal generating method that can improve the detection accuracy of targets. The radar transmitting unit (100) includes: multiple transmitting antennas for transmitting signals; and a transmitting circuit that multiplexes the transmitting signals from the multiple transmitting antennas by imparting a phase rotation amount corresponding to a Doppler frequency shift to the transmitting signals. The transmitting circuit performs code multiplexing of the transmitting signals corresponding to a first Doppler frequency shift and uses different transmitting antennas to perform time multiplexing of the transmitting signals corresponding to a second Doppler frequency shift that is different from the first Doppler frequency shift.

The application discloses a signal modulation method, a demodulation method, a communication method, equipment and a system, and belongs to the technical field of wireless communication. The application decomposes a digital domain modulation process into three basic operations of zero padding mapping, inverse Fourier transform and point-by-point phase weighting. Diagonal elements of a chirp weighting matrix used for realizing the point-by-point phase weighting are unit modulus complex exponential terms, only point-by-point phase rotation is applied to the signal without changing the amplitude, and the orthogonal structure of the Fourier basis can be maintained. A zero padding mapping matrix used for realizing the zero padding mapping is used for mapping information symbols to predetermined frequency domain positions in a dimensionally expanded signal space, only a part of dimensions carry information, and the remaining dimensions are explicitly reserved as redundant dimensions, so that the processing gain and the data rate are decoupled, and the structured sparsity used for the processing gain is directly constructed in the digital domain. By adjusting, a significant processing gain is obtained, and the link quality and the data transmission rate can be compatible under a low signal-to-noise ratio condition.