196results about How to "Guaranteed Orthogonality" patented technology

The invention provides a downlink control information configuration method which comprises the following steps: a base station configures a plurality of sets of information for a terminal through a special high-level signaling for the terminal; and the base station instructs the terminal to adopt one set of the information configured by the special high-level signaling for the terminal to receive a DMRS and / or a physical downlink shared channel PDSCH according to related information of DCI Format 1A. The invention further provides a downlink control information acquisition method which comprises the following steps: the terminal acquires the plurality of sets of information configured by the base station through the special high-level signaling for the terminal; and the terminal determines which set of the information among the plurality of sets of information is adopted to receive a DMRS and / or a physical downlink shared channel PDSCH according to the related information of DCI Format 1A. The invention further provides a base station and a terminal.

The present invention relates to a method and apparatus for generating a reference signal sequence in a wireless communication system. User equipment receives a cell-specific sequence hopping parameter from a base station, receives, from the base station, a user equipment (UE)-specific sequence group hopping (SGH) parameter which is specific to said user equipment, and generates a reference signal sequence on the basis of a base sequence number of a base sequence, wherein the base sequence number is determined for each slot on the basis of the cell-specific sequence hopping parameter and of the use equipment-specific sequence group hopping parameter. Here, the determination of whether or not to apply sequence hopping to the base sequence number indicated by the user equipment-specific sequence group hopping parameter overrides that of whether or not to apply sequence hopping to the base sequence number indicated by the cell-specific sequence hopping parameter.

The application exposes a miniature four-channel circular flow type triaxial silicon jet gyro; the jet gyro comprises a four-channel circular flow type triaxial angular velocity sensitive element and a PCB, and the sensitive element is electrically connected with the PCB, wherein the sensitive element comprises a PMMA upper cover, an upper silicon board, a lower silicon board, a PMMA bottom cover and a piezoelectric ceramic round oscillator; the piezoelectric ceramic round oscillator is embedded in the PMMA upper cover; the upper silicon board is provided with a jet network; the lower silicon board is provided with a jet network and a hot line; the PMMA upper cover, the upper silicon board, the lower silicon board and the PMMA bottom cover are successively bonded to form the sensitive element. The jet gyro adopts one piezoelectric ceramic round oscillator to drive four-channel circular flow, not only is simple in structure, long in life and low in power consumption, and implements deformation direction of the piezoelectric ceramic round oscillator and direction turning of jet flow network planes; the area of the piezoelectric ceramic round oscillator is large, the driving ability is strong, the jet velocity is high, and the jet gyro sensitivity is high; and angular velocities of three orthogonal directions can be sensitive at the same time, and multi-axis integration is achieved.

The invention discloses a near-field plume mass-spectroscopic diagnostic E*B probe based on the Faraday cup and belongs to the technical field of plasma mass-spectroscopic diagnosis. The probe mainly applied to measuring near-field plumes of an ion thruster and of a Hall thruster comprises a central frame, ferrite permanent magnets, a flat electrode plate, an electrode plate holder, a collimator tube, a drift tube, a Faraday cup, six carbon steel shells and an anti-sputtering heat-insulating layer. According to the connectional relation, the central frame is used as a core part, the ferrite permanent magnets are distributed on upper and lower surfaces of the central frame, the electrode plate is fixed in the central frame, and an orthogonal electromagnetic field area is formed. The six carbon steel shells are used for packaging, and the front ends of the shells are coated with an anti-sputtering heat-insulating layer. The collimator tube of stainless steel and the drift tube are fitly fixed to the centers of two ends of the central frame through shaft holes. Ions different in valence are screened by adjusting voltage among the electrode plates, univalent and bivalent ion currents are acquired with the Faraday cup of aluminum, and the ratio of near-field plum bivalent ions is acquired by analytical computing.

The invention discloses a method for allocating uplink reference signals, which comprises the following steps that: a base station judges whether asymmetric user equipment (UE) exists in an uplink member carrier of a multi-carrier polymerization system, wherein the asymmetric user equipment (UE) refers to the user equipments (UE) which use the same uplink member carrier and different downlink member carrier; if the base station judges that the asymmetric user equipment (UE) exists in the uplink member carrier, the base station indicates the serial number of the uplink reference signal root sequence to the asymmetric user equipment (UE) according to a signaling, and the asymmetric user equipment (UE) allocates an uplink reference signal according to the signaling. The method definitely indicates the reference signal sequence in the uplink member carrier by the signaling, can avoid the interference between the UE because the downlink member carrier uses different Cell ID, and can ensure the orthogonality of the uplink reference signal sequences.

The invention discloses a method, device and system for transmitting demodulation reference signals (DMRSs), for solving the problem that the orthogonality of each UE pilot frequency cannot be ensued when multiple UE is simultaneously accessed in the prior art. The method provided by the embodiments of the invention comprises: according to a correspondence table of an antenna port and a transmission layer number, respectively selecting a correspondence provided with the same transmission layer number as each UE for at least two UE which performs MU-MIMO communication at the same resource, and respectively distributing the antenna ports in each selected correspondence to the corresponding UE, the different antenna ports being distributed to the different UE; and notifying the corresponding UE of the index numbers of the selected correspondence, and sending the DMRSs through the antenna ports in the selected correspondence. According to the embodiments of the invention, the orthogonality of the DMRSs of multiple simultaneously accessed UE can be ensured, the system capacity is enhanced, simultaneous access of UE with multiple different transmission layer numbers can be supported, and the system flexibility is improved.

The present invention provides a method and apparatus for generating a reference signal sequence by user equipment (UE) in a wireless communication system. The UE receives a UE-specific sequence group hopping (SGH) parameter that is specific to itself, and generates a reference signal sequence based on a base sequence in each slot unit. The base sequence is classified into sequence-group numbers determined in each of the slot units by the UE-specific SGH parameter indicating whether SGH has been carried out, and base sequence numbers.

Provided are a method and an apparatus for transmitting an uplink (UL) reference signal (RS) in a wireless communication system. A first user equipment (UE) served through a macro eNodeB (eNB) generates a first UL RS on the basis of a first indicator and transmits the generated first UL RS. A second UE served through a pico eNB having the same cell identifier (ID) as the macro eNB generates a second UL RS on the basis of a second indicator and transmits the generated second UL RS. The bandwidth to which the first UL RS is transmitted is overlapped with the bandwidth to which the second UL RS is transmitted.

The invention provides a method and device for correcting wireless local area network (WLAN) chip radio-frequency transmitter LO leakage. The device is formed by an analog compensation circuit and digital LO leakage estimation and correction. In order to eliminate the LO leakage introduced by a radio-frequency circuit at a transmitter and enable emitting signals to be accord with the frequency spectrum requirement of a WLAN protocol, the device is added with the compensation circuit at the radio frequency portion; then the deviation values of I / Q two paths of signals are estimated through a digital one-dimensional scanning method; and the estimation results are written into the compensation circuit of the radio frequency portion, thereby realizing the correction of the LO leakage of the transmitter.

A z-direction magnetic field sensor with a magnetic orbit structure comprises a basement, two pairs of input electrodes and output electrodes, two pairs of giant magneto resistive (GMR) sensitive elements and GMR reference elements and an accumulator of magnetic line of force arranged in a symmetrical mode. The two pairs of the input electrodes and the output electrodes are plated on the surface of the basement, and each pair of the GMR sensitive element and the GMR reference element and each pair of the input electrode and the output electrode form a Wheatstone bridge. A first pit and a second pit are arranged on the basement in a symmetrical mode, the Wheatstone bridge is arranged between the first pit and the second pit, edges of the inner planes of the first pit and the second pit and slopes of the first pit and the second pit and the pits are all provided with soft magnetic films in a plating mode to form an inner accumulator of the pit, the slope accumulator of the pit, and the edge accumulator of the pit in sequence, due to the fact that a central accumulator is arranged in the middle area between the first pit and the second pit, the accumulator of the magnetic line of force is formed. The z-direction magnetic field sensor with the magnetic orbit structure has the advantages of being simple and compact in structure, small in size, low in cost, convenient to manufacture, and high in resolution capability and the like.

The invention belongs to the radar technology field and the signal processing field, and relates to application of a multiple input multiple output (MIMO) type system, in particular to an MIMO radar sparse imaging algorithm based on a hybrid matching pursuit algorithm. The MIMO radar sparse imaging algorithm comprises the steps that firstly, M emitting array elements emit orthometric phase-coded signals, and N receiving array elements receive the phase-coded signals; secondly, a matched filter of a receiver of each receiving array element conducts matched filtering on the received phase-coded signals; thirdly, fourier transform is conducted on the matched-filtered signals, and a spatial spectral domain echo expression is obtained. Index selection of each time in the HMP algorithm is realized through an OMP algorithm, orthogonality of base signal selection is guaranteed through the operation, and spatial surface elements which are very close to one another can be distinguished when fourier similar characteristics exist in a dictionary matrix; meanwhile, backtracking selection operation in the HMP algorithm is the same as that in an SP algorithm.

The invention discloses a user random access method and device based on ephemeris broadcast auxiliary positioning, which are applied to mobile communication system for satellite. A ground terminal receives a downlink synchronization sequence and an ephemeris periodically broadcasted by a satellite; in a downlink time-frequency synchronization stage, a signal arrival time difference and a Doppler frequency offset sequence are obtained, the Doppler frequency offset sequence is converted into another group of timing information, and in combination with a satellite ephemeris table, a satellite-to-ground distance is estimated and satellite-to-ground propagation time delay is predicted to serve as a random access uplink timing advance. According to the invention, a positioning algorithm based ontime arrival difference is used; the established model can cope with various satellite-ground distance measurement conditions in a satellite scene, so that the timing advance error of each terminal signal can be in a cyclic prefix, and the orthogonality between uplink signals of different terminal users in a cell range when orthogonal frequency division multiple access transmission is adopted isensured. Compared with a random access timing advance scheme redesigned by a leader sequence, the method does not need to increase access power consumption and is easy to implement.

The invention discloses an uplink control information feedback and receiving method, a base station and a relay station, which can maintain the orthogonality of a PUCCH (Physical Uplink Control Channel) of the relay station and a PUCCH of UE (user equipment) while realizing the flexible PUCCH resource distribution of the relay station. The uplink control information feedback method comprises the following steps of: receiving PUCCH format 2 / 2a / 2b channel resources distributed by the base station; and feeding back uplink control information on the PUCCH format 2 / 2a / 2b channel resources, wherein the uplink control information comprises answering information and / or SRI information. The method for receiving the uplink control information comprises the following steps of: assigning the PUCCH format 2 / 2a / 2b channel resources to the relay station, and receiving the uplink control information fed back by the relay station on the PUCCH format 2 / 2a / 2b channel resources, wherein the uplink control information comprises answering information and / or SRI information. The embodiment of the invention can maintain the orthogonality of the PUCCH of the relay station and the PUCCH of the UE while realizing the flexible PUCCH resource distribution of the relay station.

The invention belongs to the radar technology field and signal processing field and more particularly, to a tensor-sparse-representation-based MIMO radar's imaging method for a multi-input and multi-output type system. The method comprises: transmitting by M emission array elements mutually orthogonal phase coded signals; receiving by N receiving array elements the phase coded signals; using a matched filter to perform matched filtering to the received radar signals; conducting the Fourier transform to the signals after matched filtering to obtain the spatial spectral echo expression; performing mesh generation to the scene; and discretizing the radar echoes to obtain the mathematical expression for radar imaging and focusing under the compression sensing framework. The method of the invention overcomes the shortcoming of a DAS method which has intrinsically low resolutions and high side lobes. Compared with other classic imaging method featuring compression sensing, the THMP method of the invention fully utilizes the tensor characteristics of received signals to conduct sparse signal recovery, which avoids the information loss of the internal structure of the signals brought about by the vectorized operations.

The invention provides a space-time block coded spatial modulation method, belongs to the technical field of communication and is used for improving diversity gain of a system. The method comprises the steps that an input information bit sequence is allocated; space constellation matrix selection is carried out on a previous part of bits; constellation symbol mapping is carried out on a rear partof bits; modulated symbols are preprocessed through a P matrix to obtain new modulation symbols; cross processing is carried out on the new modulation symbols; a novel space-time block coded codewordmatrix X is obtained through coding; and the codewords C of a novel space-time block coded spatial modulation scheme are obtained; in order to ensure full diversity, corresponding phase rotation is carried out on transmitted codewords; the codewords are not overlapped with each other; and the full diversity space-time coded design is realized. According to the method, a single mapping symbol is coded and then is allocated to different transmitting antennas for transmission in a plurality of time slots, the diversity gain is clearly improved, and the bit error rate performance of the system isimproved.

The invention discloses a polarization multiplexing band interpolation based OFDMA-PON (orthogonal frequency division multiple access-passive optical network) system which is characterized in that: two paths of OFDM (orthogonal frequency division multiplexing) signals are respectively produced at an optical line terminal, and sub-bands of the two paths of OFDM signals are mutually interleaved; and through respectively carrying out optical modulation and polarization control on the OFDM signals, two paths of optical OFDM signals in the x and y polarization directions are respectively obtained, and then combined into one path so as to form optical OFDM signals without protection bands, in such a way, the bandwidth of the system is fully used. An optical distribution network divides the received optical OFDM signals into optical OFDM signals in the x and y polarization directions, then an optical beam splitter divides the OFDM signals into multiple paths, and an optical filter extracts the optical OFDM signals divided by the optical beam splitter, selects required different sub-band optical OFDM signals or different numbers of sub-band optical OFDM signals, and sends the selected signals to respective optical network units, thereby achieving the variable-speed access of the optical network units.

The invention provides a time lead indication method and device, a base station and a terminal. The method comprises the steps of sending sub-carrier interval configuration information of a physical uplink sharing channel (PUSCH) and / or a physical uplink control channel (PUCCH) to the terminal; receiving a lead code fed back by the terminal according to the sub-carrier interval configuration information; according to the lead code, acquiring a quantized value of the time lead corresponding to a tracking area; and sending the quantized value of the time lead to the terminal. According to the method, device, base station and terminal provided by the embodiment of the invention, under the condition of ensuring that the signaling overhead is invariable, the indication of the uplink time lead is effectively achieved, and the condition that the random access mechanism of 5G NR can adjust the quantized interval of the time lead according to the uplink carrier interval is ensured, and the uplink orthogonality is achieved.

A modularized atomic energy microscope is disclosed, comprising seven modules. The first one is stepper motor the second is sample support with four-dimensional adjustment fixed on stepper motor, the third is z direction scanner, the fourth consists of microbracket needle point and focusing lens, the fifth is xy direction scanner, the sixth consists of semiconductor laser with focusing lens, reflector, imaging lens and four-quadrant photoelectric sensor, the seventh consists of optical microscope, CCD camera, monitor. The invention has convenient adjustment and replacement to modularized atomic energy microscope, and using each module to construct atomic energy microscope with different structure is easy and sample has function of coarse positioning.

The invention relates to an inertia measurement unit, in particular to a minisize embedded inertia measurement unit having the anti-high overload performance, which solves the problems of low installation accuracy and poor anti-overload performance of the existing inertia measurement unit. The minisize embedded inertia measurement unit having the anti-high overload performance comprises an installation body, three accelerometers and three spinning tops, wherein the installation body is an integrated structure; the installation body is provided with three concave platforms for accommodating the three accelerometers, three concave platforms for accommodating the three spinning tops, a hollow bus routing structure, a hollow outlet structure and a hollow embedment structure; the three accelerometers are respectively installed on the three concave platforms thereof, and the three spinning tops are respectively installed on the three concave platforms thereof. The invention effectively solves the problems of low installation accuracy and poor anti-overload performance of the existing inertia measurement unit, and is especially applicable to the guidance-function reconstruction and application of high-overload weapons such as cannonballs and the like.

The invention discloses a flight test and ground simulation aerodynamic force data comprehensive modeling method, which is used for establishing a full-airspace and full-speed-domain aerodynamic forcemathematical model of an aircraft according to more than 10 flight test data samples and aerodynamic force ground simulation data in a flight envelope range of the aircraft. The method comprises thefollowing steps: firstly, performing aerodynamic force calculation ground simulation within a flight envelope range of an aircraft, obtaining aerodynamic force simulation data in a full airspace and afull speed domain, and converting the aerodynamic force simulation data into an aerodynamic force simulation sample; And performing a flight test, obtaining more than 10 times of flight test state measurement data, and obtaining an aerodynamic force identification data sample of the flight test according to an aerodynamic force identification method. And finally, taking the aerodynamic force identification data sample and the aerodynamic force simulation sample together as a total sample, and establishing an aircraft full-airspace and full-speed-domain aerodynamic mathematical model integrating flight test and ground simulation data through machine learning by utilizing an artificial intelligence-based BP neural network method.

The invention discloses a method for solving three-dimensional coordinate conversion parameters with random rotation angles. The method comprises the following steps: firstly, obtaining three-dimensional coordinates of common points under two coordinate systems; secondly, establishing a Bursa conversion model; thirdly, establishing a constraint equation; fourthly, establishing an error equation; fifthly, solving the error equation; sixthly, calculating errors in unit weight; seventhly, estimating validity of a rotation matrix, scale factors and three-dimensional translation components according to a variance-covariance matrix; eighthly, displaying results of the rotation matrix. According to the method, nine parameters in the rotation matrix are taken as unknown parameters, and the constraint equation is established as a constraint condition to be introduced into the error equation for solving parameters of the three-dimensional coordinate conversion with the random rotation angles;; the method is rigorous, the mathematical model is simple and easy to realize, the unknown parameters do not need to be linearized, and initial values of the rotation angles in the two three-dimensionalcoordinate systems can be randomly given.

The invention relates to a hypersonic velocity pointed conical appearance heat flux density modeling approach based on functional optimization. The approach comprises the steps of utilizing a hypersonic velocity calorimetric wind tunnel to conduct a ground calorimetric test on n pointed conical models with different shrink ratios of an aircraft; obtaining heat flux density distribution laws of n models with different shrink ratios in the hypersonic velocity calorimetric wind tunnel to obtain heat flux density test values Qwi respectively, wherein 1<=i<=n; adjusting wind tunnel test parameters in the hypersonic velocity calorimetric wind tunnel, and obtaining a first set of heat flux density test values Qwij, wherein j is wind tunnel test times; obtaining heat flux density distribution laws of a first set of aircrafts; totally obtaining heat flux density distribution laws Qwk of k sets of aircrafts; applying a functional optimization algorithm, introducing a wind tunnel quality variable a and a calibration model parameter b, conducting iterative operation on Qwk, solving an optimal spatial alternation, and obtaining pointed conical heat flux density model Qw. The hypersonic velocity pointed conical appearance heat flux density modeling approach based on the functional optimization avoids one-sidedness of a modeling method in the prior art and interference of human experience factors.

A method for transmitting channel measurement pilot is provided in the present invention. The method includes that: M cells constitute a group of channel measurement pilot orthogonal cells, the location of time-frequency resources for transmitting the channel measurement pilot by any cell in the group is orthogonal with the location of time-frequency resources for transmitting the channel measurement pilot by other cells in the group; for any cell in the group, the channel measurement pilot is transmitted by avoiding the time-frequency resources occupied by a downlink specific pilot of the present cell. The corresponding apparatus is also provided in the present invention. The present invention not only ensures the orthogonality of the channel measurement pilot pattern in one group of cells, meets the measurement requirement of coordinated multiple point transmission, but also avoids the downlink specific pilot of antenna port 5.

The invention relates to a method of abutting joint of two total segments in the shipbuilding process, which utilizes a laser theodolite to measure the same surface degree of an abutting joint seam. The laser theodolite must be arranged to be orthogonal with the center line of a hull. Under the condition of a ruling line detected to be beyond a size, the remain is cut to ensure the surface degree tolerance of a finished abutting joint surface to be at most 2 mm. The method increases the construction abutting joint accuracy and speed of the two total segments and reduces hull trimming workload and the occurring of two positioning accidents. The laser theodolite is used to measure, score and finish an end surface, and firstly the same surface degree of the abutting joint surface and the orthogonality of the abutting joint surface and a center surface must be ensured. A baseline on a bottom folding target rod is utilized to measure the deflection degree of the bottom baseline, therefore the slope of the baseline is determined, and finally the method ensures the angle between the abutting joint plane and a baseline surface to be a right angle.

The invention discloses a brand new orthogonality-training-based clock estimation method of bi-direction relay channel physical layer network coding. In a bi-direction relay channel PNC, two signals arrive at a relay node at different time, and then relative time migration exists. According to the method, firstly, the relative time migration is converted into the difference of two absolute time migrations, secondly, the two absolute time migrations are estimated, and finally, the estimation value of the relative time migration is obtained. According to the estimation of the two absolute time migrations, two estimation algorithms including the optimization sampling point algorithm and the interpolation algorithm based on discrete Fourier transform are put forward. The estimation on any absolute time migration can be achieved through any algorithm. By means of a Matlab simulation platform, the feasibility of the brand new orthogonality-training-based clock estimation method is verified, and the optimal algorithm combination is found. By means of the combination, when the signal to noise ratio is small, the mean square error of the system is very close to the theory lower bound, and meanwhile the calculation amount is small.

The invention discloses a method for extracting the fault signal feature information of an aero-engine rotor system, and the method comprises the steps: collecting a rotor rub-impact vibration signal,and carrying out the FDM decomposition of the collected rotor rub-impact vibration signal to obtain complete rotor rub-impact vibration signal FIBFs components; constructing a Hankel matrix of the rotor rub-impact vibration signal after noise reduction, and drawing a singular value curve of the rotor rub-impact vibration signal after noise reduction; determining a singular value catastrophe point, carrying out the reconstruction of an order number, and carrying out the envelope spectrum analysis, thereby achieving the effective extraction of fault information. According to the invention, themethod achieves the reasonable extraction of the fault feature frequency of a rotor system based on the FDM decomposition and singular value differential spectrum analysis, and achieves the efficientfiltering of the noise signal component in the rub-impact vibration signal, thereby achieving the extraction of the weak fault feature information from the low-frequency strong noise background, and achieving the effective extraction of the fault information.

The invention provides a joint compensation method of mode dependent loss and polarization dependent loss. The method comprises the following steps: S1, performing constellation modulation on a bit signal; S2, performing mode polarization time encoding on the signal after the constellation modulation; S3, performing light modulation on the signal after the mode polarization time encoding; S4, performing light polarization beam combination on the signal after the light modulation; S5, performing mode coupling on the signal after the light polarization beam combination; S6, decoupling the signal in mode coupling; S7, performing light polarization beam splitting on the decoupled signal; S8, performing coherent demodulation on the signal after the light polarization beam splitting; S9, performing channel equalization on the signal after the coherent demodulation; S10, performing mode polarization time decoding on the signal after the channel equalization; and S11, performing constellation demodulation on the decoded signal. Through the adoption of the method provided by the invention, the mode dependent loss and the polarization dependent loss in the transmission process can be effectively inhibited, and the system performance is improved.

The invention discloses a key generation method applied to a multi-user large-scale MIMO (Multiple Input Multiple Output) system, which comprises the following steps: generating a key in a beam domain: firstly, respectively carrying out link detection on a base station and each user, and designing a precoding matrix and a receiving matrix according to a detection result; then the base station andeach user respectively using the precoding matrix and the receiving matrix to send pilot signals to each other, and respectively preprocessing the received signals and forming an initial secret key through channel estimation; and finally, obtaining a consistent random key between the base station and each user through information reconciliation and privacy amplification. According to the technicalscheme of the invention, when an existing single-user point-to-point secret key generation mode is applied to a multi-user large-scale MIMO communication system, the multi-user point-to-point secretkey can be generated. The problems of overlong pilot signal length and high pilot overhead caused by the increase of the number of antennas and the number of users are solved, meanwhile, the designedprecoding and receiving matrixes can realize the key rate maximization, and the safety of a communication system is ensured by a non-overlapping beam set.

The invention provides a method for generating waveforms in radio communication and in particular provides a method for generating waveforms of non-sinusoidal orthogonal bandpass signals in time domain. The method has the beneficial effects of simple hardware structure and low implementation cost. The method can generate the waveforms, with in-band energy concentration the same as that of the prolate spheroidal wave function (PSWF) of baseband, of the orthogonal bandpass signals in time domain in any frequency range, ensures the number of the orthogonal waveforms to double that of the original PSWF waveforms and can be used for improving the frequency band use ratios and the power use ratios of the radio communication systems. The generation method is characterized by determining the parameters according to the spectrum mapping relation and the sampling theorem, solving the numerical solution of PSWF of baseband by the numerical solution method, converting the signals to the analog signal waveforms through analog-to-digital conversion and low-pass filtering and carrying out time domain multiplication on the analog signal waveforms and the same frequency orthogonal sine / cosine functions with phase difference shown in the specification respectively, thereby obtaining the orthogonal waveforms.