35results about How to "Bandwidth unchanged" patented technology

The invention discloses a high bit rate and low range resolution of low sidelobe phase coded signal design method which mainly aims at solving the problems that the range sidelobe of a phase coded signal cannot be further reduced by the existing method and the existing phase coded signal is easy to identify. The implementation process of the high bit rate and low range resolution of low sidelobe phase coded signal design method comprises step 1, setting the code element length of a phase coded signal; step 2, setting a value of the main lobe width control quantity of the phase coded signal; step 3, building an objective function of the phase coded signal according to the code element length and the main lobe width control quantity of the phase coded signal; step 4, building constraint conditions of the phase coded signal; step 5, solving the objective function by an optimization algorithm under the constraint conditions to obtain an optimized phase coded signal. According to the high bit rate and low range resolution of low sidelobe phase coded signal design method, the range sidelobe of the phase coded signal can be further reduced, the identified difficulty of the phase coded signal can be increased, and the high bit rate and low range resolution of low sidelobe phase coded signal design method can be applied to the design of the phase coded signal.

The invention belongs to the field of a radar technology, and discloses a wide-main-lobe phase coding signal and mismatch filter combined optimization method. The method comprises the following steps: determining a code element length Ns of a phase coding signal s and a main lobe width control amount M of the phase coding signal; setting a length Nh of a mismatch filter h, and according to the code element length Ns of the phase coding signal s, the main lobe width control amount M of the phase coding signal and the length Nh of the mismatch filter h, constructing a target function about the phase coding signal s and the mismatch filter h; and based on a minimum p norm optimization algorithm, solving the target function of the phase coding signal s and the mismatch filter h, and obtaining the mismatch filter h and an optimized phase coding signal s'. The method can reduce the distance sidelobe level of the phase coding signal after pulse compression.

The invention discloses a photoreceiver preamplifier circuit with high sensitivity and a wide dynamic range. The circuit comprises a photodiode, a trans-impedance amplifier, a single-end-to differential amplifier, an output buffer circuit, a peak detection circuit and a direct current maladjustment eliminating circuit. Aiming at the input stage trans-impedance amplifier of the photoreceiver preamplifier circuit, the technical scheme designs a novel three-stage push-pull inverter structure, has the characteristics of high gain and low noise, and improves the sensitivity of the preamplifier; a virtual zero point is designed in a feedback loop, so that the work rate of the trans-impedance amplifier is improved, and the stability is increased; provides is a new automatic gain control technology with an adaptive function, so that the trans-impedance amplifier keeps bandwidth invariable and keeps the loop stable under the different optical input powers, and has the characteristic of wide dynamic range.

The invention belongs to the technical field of radar, and discloses a distributed MIMO (multiple-input multiple-output) radar orthogonal wide main lobe phase-coded signal design method, which can acquire low autocorrelation peak side lobe level and peak cross-correlation level in a condition of ensuring the bandwidth of the orthogonal wide main lobe phase-coded signal to be unchanged. The method comprises steps: the number of sub phase-coded signals in the orthogonal wide main lobe phase-coded signal, the symbol length of each sub phase-coded signal and a main lobe width control variable after each sub phase-coded signal is subjected to pulse compression are determined; according to the number of the sub phase-coded signals in the orthogonal wide main lobe phase-coded signal, the symbol length of each sub phase-coded signal and the main lobe width control variable after each sub phase-coded signal is subjected to pulse compression, an objective function for the orthogonal wide main lobe phase-coded signal is constructed; and the objective function for the orthogonal wide main lobe phase-coded signal is solved, and the orthogonal wide main lobe phase-coded signal is obtained.

The invention provides a method and a device for changing an annealing furnace transmission system on line. The method comprises the following steps of: arranging a transmission piece on a transmission shaft of a to-be-changed annealing kiln; additionally arranging an auxiliary drive device for driving the transmission piece; adjusting the rotation speed of the auxiliary drive device to match with the rotation speed of the transmission shaft which is originally driven by the annealing kiln transmission system, and driving the transmission piece and driving the transmission shaft to operate by utilizing the auxiliary drive device; changing a fault drive device of the annealing kiln to be a novel drive device; and turning off the driving of the auxiliary drive device to the transmission piece, and starting the novel drive device for driving the transmission piece. The method for changing the annealing furnace transmission system on line not only can be used for shortening the changing time length, but also can be used for reducing the labor power and the labor intensity. Besides, in a changing process of the annealing furnace transmission system, glass bandwidth is kept unchanged, so that waste glass is not generated in the whole changing process only by lowering pulling amount and pulling speed, and therefore, the economic benefits of glass manufacturing enterprises can be improved.

The disclosure relates to a method and device for processing PBCH bandwidth, a base station, and a computer-readable storage medium. Wherein, the processing method of the PBCH bandwidth includes: judging whether the current frequency band is a preset type frequency band, wherein, the preset type frequency band can use two kinds of subcarrier spacing SCS; if the current frequency band is a preset type frequency band, then reducing The number of PBCH information bits contained in the load and the number of resource elements RE occupied by the demodulation reference signal DMRS in the synchronization signal block SSB corresponding to the current frequency band remain unchanged, or the number of PBCH information bits contained in the load in the PBCH corresponding to the current frequency band remains unchanged. Change and reduce the number of REs occupied by DMRS in the SSB corresponding to the current frequency band. The embodiments of the present disclosure can solve the problem that the UE takes too long to search for the synchronization signal.

The invention discloses a high-voltage amplifier based on wireless data transmission isolation, and a control method thereof. The high-voltage amplifier comprises a main control processing unit and a plurality of auxiliary amplifier units; the main control processing unit comprises a main single-chip microcomputer, a main radio-frequency data transceiving module and a main power supply module; the main radio-frequency data transceiving module and the main power supply module are connected to the main single-chip microcomputer; the auxiliary amplifier units each comprise a slave radio-frequency data transceiving module, a signal conditioning and acquiring module, a slave single-chip microcomputer, a DDS waveform synthesis module, a filter module, a relay module, a same-phase / reverse-phase amplifier module and a slave power supply module; the slave radio-frequency data transceiving module, the signal conditioning and acquiring module, the relay module and the slave power supply module are connected with the slave single-chip microcomputer; and the slave single-chip microcomputer, the DDS waveform synthesis module, the filter module, the relay module and the same-phase / reverse-phase amplifier module are sequentially connected. By means of the high-voltage amplifier based on wireless data transmission isolation, and the control method thereof disclosed by the invention, the problem that the isolation voltage of an isolation amplifier is too low can be solved; and simultaneously, the amplifier waveform distortion problem based on the isolation amplifier or an optical coupler can be solved.

The invention belongs to the field of a radar technology, and discloses a mismatch filter optimization method of high-code-rate low-distance resolution phase coding signals. The optimization method comprises the following steps: determining phase coding signals s; according to the phase coding signals s and the length Nh of a mismatch filter h, constructing a target function of the mismatch filter h; constructing a constraint condition of the target function about the mismatch filter h; according to the constraint condition of the target function, solving the target function of the mismatch filter h; and determining the mismatch filter. The method provided by the invention can reduce the distance sidelobe level of the phase coding signals after pulse compression.

The invention discloses an adjustable high-frequency electromagnetic bandgap bandpass filter, which belongs to the field of microwave / millimeter wave filters. The high-frequency electromagnetic bandgap bandpass filter is manufactured by LTCC technology, and includes: an EBG resonant cavity and a bottom stack structure, and the EBG resonant cavity contains a capacitor structure. The filter of the present invention introduces a high-Q capacitor structure into the EBG cavity to greatly reduce the operating frequency of the filter, so that the small-sized EBG structure can also work in the low-frequency band, and the operating frequency can be adjusted by adjusting the size of the capacitor plate. The bandwidth remains unchanged; the present invention adopts a multi-layer structure, and increases the energy storage capacity of the filter and the Q value by adding a dielectric plate and a metal plate structure at the bottom layer; in addition, the present invention also has the advantages of simple and adjustable, simple structure, easy integration, etc. Advantages, can be applied in the high frequency field in the future.

The invention provides a method and a device for changing an annealing furnace transmission system on line. The method comprises the following steps of: arranging a transmission piece on a transmission shaft of a to-be-changed annealing kiln; additionally arranging an auxiliary drive device for driving the transmission piece; adjusting the rotation speed of the auxiliary drive device to match with the rotation speed of the transmission shaft which is originally driven by the annealing kiln transmission system, and driving the transmission piece and driving the transmission shaft to operate by utilizing the auxiliary drive device; changing a fault drive device of the annealing kiln to be a novel drive device; and turning off the driving of the auxiliary drive device to the transmission piece, and starting the novel drive device for driving the transmission piece. The method for changing the annealing furnace transmission system on line not only can be used for shortening the changing time length, but also can be used for reducing the labor power and the labor intensity. Besides, in a changing process of the annealing furnace transmission system, glass bandwidth is kept unchanged, so that waste glass is not generated in the whole changing process only by lowering pulling amount and pulling speed, and therefore, the economic benefits of glass manufacturing enterprises can be improved.

The invention discloses a trellis coded modulation method applicable to an electrical interconnection system among high speed backplane chips, and relates to a trellis coded modulation technology applicable to the electrical interconnection system among the high speed backplane chips. According to the method, by the collaborative design of channel coding and signal modulation, coding gain can be obtained on the premises of not increasing the channel bandwidth and not lowering the transmission rate of effective information, so that the performance of serial single link among chips is improved. A sending end of a system comprises a data parallel / serial conversion, a trellis coded modulation and a forward feedback equalizer. The trellis coded modulation utilizes a measure combining the convolutional encoding and the four-level pulse amplitude modulation. A receiving end of the system comprises a continuous time linear equalizer, a decision feedback equalizer, a clock data recovery, a soft output Viterbi decoding and a data parallel / serial conversion. The update of a coefficient of a filter of the decision feedback equalizer is based on an error correction signal after the soft decision Viterbi decoding.

The invention discloses a high bit rate and low range resolution of low sidelobe phase coded signal design method which mainly aims at solving the problems that the range sidelobe of a phase coded signal cannot be further reduced by the existing method and the existing phase coded signal is easy to identify. The implementation process of the high bit rate and low range resolution of low sidelobe phase coded signal design method comprises step 1, setting the code element length of a phase coded signal; step 2, setting a value of the main lobe width control quantity of the phase coded signal; step 3, building an objective function of the phase coded signal according to the code element length and the main lobe width control quantity of the phase coded signal; step 4, building constraint conditions of the phase coded signal; step 5, solving the objective function by an optimization algorithm under the constraint conditions to obtain an optimized phase coded signal. According to the high bit rate and low range resolution of low sidelobe phase coded signal design method, the range sidelobe of the phase coded signal can be further reduced, the identified difficulty of the phase coded signal can be increased, and the high bit rate and low range resolution of low sidelobe phase coded signal design method can be applied to the design of the phase coded signal.

The invention provides a programmable gain amplifier applicable to a transmitting end of a communication system. The programmable gain amplifier comprises a plurality of programmable gain amplification circuits and an output buffer stage applicable to the transmitting end, wherein every two programmable gain amplification circuits are connected in an alternating current coupling mode, and each programmable gain amplification circuit and the output buffer stage applicable to the transmitting end are also connected in the alternating current coupling mode; a signal output end of each programmable gain amplification circuit is connected with a signal input end of the subsequent programmable gain amplification circuit; and a signal output end of the last programmable gain amplification circuit is connected with a signal input end of the output buffer stage applicable to the transmitting end. By the adoption of the programmable gain amplifier provided by the embodiment of the invention, a larger gain regulating range can be provided, and requirements on linearity and bandwidth can be met.

In order to solve the problem that the management module of the existing modular switch has relatively single functions and is likely to cause waste of resources, the present invention discloses a modular switch and a method for exchanging data thereof, wherein the modular switch includes: a switch backplane and at least two Each switching service module includes the same number of data channel interfaces as other switching service modules, each data channel interface of each switching service module is directly connected to a data channel interface of another switching service module, and the same switching service module The switching service modules connected to each data channel interface of the service module are different from each other, and the lines between the data channel interfaces are arranged on the backplane. Directly connected, so that the management module is no longer needed to avoid waste of resources.

The invention discloses an adjustable high-frequency electromagnetic band gap band-pass filter, and belongs to the field of microwave / millimeter wave filters. The high-frequency electromagnetic band gap band-pass filter is manufactured by an LTCC process and comprises an EBG resonant cavity and a bottom stacking structure, and a capacitor structure is contained in the EBG resonant cavity. According to the filter, a high-Q-value capacitor structure is introduced into an EBG cavity, so that the working frequency of the filter is greatly reduced, a small-size EBG structure can also work in a low-frequency band, the working frequency can be adjusted by adjusting the size of a capacitor plate, and the relative bandwidth is kept unchanged; by adopting a multi-layer structure, the energy storage capacity of the filter is improved by adding the dielectric plate and the metal plate structure on the bottom layer, and the Q value is improved; in addition, the invention has the advantages of simplicity, adjustability, simple structure, easiness in integration and the like, and can be applied to the future high-frequency field.

The invention belongs to the technical field of radar, and discloses a quadrature wide main lobe phase coded signal and mismatched filter joint optimization method, which can reduce autocorrelation peak side lobe level and peak cross-correlation level after quadrature wide main lobe phase coded signals are subjected to pulse compression through the mismatched filters. The method comprises steps: the number of sub phase coded signals in the quadrature wide main lobe phase coded signals and the symbol length of each sub phase coded signal are determined; the length of each sub mismatched filter in the mismatched filter group is determined, and the main lobe width control quantity after each sub phase coded signal passes through the corresponding sub mismatched filter is determined; according to the quadrature wide main lobe phase coded signals, the mismatched filters and the main lobe width control quantity, an objective function for the quadrature wide main lobe phase coded signals and the mismatched filters is built; and the objective function is solved, and the quadrature wide main lobe phase coded signals after optimization and the mismatched filters after optimization are obtained.

The present invention provides a message transmission method, a backbone switch and an access switch. The method includes: when the communication link between the first backbone switch and the second backbone switch fails, the first backbone switch The ingress switch sends a notification message, and the notification message is used to instruct the first access switch to split the first V-shaped communication link in the same trunk between the first backbone switch, the second backbone switch, and the first access switch into separate The second communication link and the third communication link in the two trunks; the first backbone switch receives the response message sent by the first access switch; the first backbone switch sends the first access switch to the first access switch through the second communication link according to the response message The switch sends the message, so that the first access switch forwards the message to the second backbone switch through the third communication link. The embodiment of the present invention can keep the normal operation of the SVF system without splitting when the peer-link fails, so as to keep the bandwidth of the SVF system unchanged.

The invention belongs to the field of a radar technology, and discloses a wide-main-lobe phase coding signal and mismatch filter combined optimization method. The method comprises the following steps: determining a code element length Ns of a phase coding signal s and a main lobe width control amount M of the phase coding signal; setting a length Nh of a mismatch filter h, and according to the code element length Ns of the phase coding signal s, the main lobe width control amount M of the phase coding signal and the length Nh of the mismatch filter h, constructing a target function about the phase coding signal s and the mismatch filter h; and based on a minimum p norm optimization algorithm, solving the target function of the phase coding signal s and the mismatch filter h, and obtaining the mismatch filter h and an optimized phase coding signal s'. The method can reduce the distance sidelobe level of the phase coding signal after pulse compression.

The invention discloses a TIA overload current correction method and circuit used in an optical receiver in the technical field of optical communication. The steps of the method include: obtaining two AC voltage signals output by the pseudo-differential transimpedance amplifier circuit; obtaining the current overload signal value through the output two AC voltage signals; comparing the current overload signal value with a preset reference voltage value, and when When the value of the current overload signal is greater than the preset reference voltage value, the current part of one input terminal of the pseudo-differential transimpedance amplifier circuit is shunted to the other input terminal. The beneficial effect of the present invention is that in high-speed circuits and systems, the pseudo-differential TIA AC current is shunted to the virtual GND point instead of the physical GND point, reducing the components in the circuit and reducing the difficulty of circuit component layout; The stability of the TIA is maintained, and the bandwidth of the TIA remains unchanged; from the perspective of virtual GND, the parallel capacitance of the MOS device is halved, thereby reducing the parasitic capacitance.

The invention belongs to the technical field of radar, and discloses a distributed MIMO (multiple-input multiple-output) radar orthogonal wide main lobe phase-coded signal design method, which can acquire low autocorrelation peak side lobe level and peak cross-correlation level in a condition of ensuring the bandwidth of the orthogonal wide main lobe phase-coded signal to be unchanged. The method comprises steps: the number of sub phase-coded signals in the orthogonal wide main lobe phase-coded signal, the symbol length of each sub phase-coded signal and a main lobe width control variable after each sub phase-coded signal is subjected to pulse compression are determined; according to the number of the sub phase-coded signals in the orthogonal wide main lobe phase-coded signal, the symbol length of each sub phase-coded signal and the main lobe width control variable after each sub phase-coded signal is subjected to pulse compression, an objective function for the orthogonal wide main lobe phase-coded signal is constructed; and the objective function for the orthogonal wide main lobe phase-coded signal is solved, and the orthogonal wide main lobe phase-coded signal is obtained.

A passive filter circuit and a transmission circuit, the passive filter circuit includes: a first selection circuit whose input terminal is connected to an input signal, the first selection circuit includes a plurality of parallel first selection sub-circuits, each selection sub-circuit The circuit is suitable for being controlled to be turned on to transmit the input signal or controlled to be turned off to stop transmitting the input signal; a second selection circuit, whose input terminal is coupled to the output terminal of the first selection circuit, the second selection circuit The selection circuit includes a plurality of second selection sub-circuits connected in parallel, each second selection sub-circuit is adapted to be controlled to be turned on to pass the output signal of the first selection circuit, or controlled to be turned off to stop passing the first selection circuit. an output signal of the selection circuit; a first capacitor, one end of which is coupled to the output end of the first selection circuit; a first load, one end of which is coupled to the output end of the first selection circuit, and the other end of which is coupled to the output end of the first selection circuit A capacitor at the other end. The technical scheme of the present invention can realize gain control in the passive filter circuit.

The invention discloses a radio frequency optical comb instrument with independently adjustable bandwidth and frequency, which is suitable for the field of radio frequency photons. The radio frequencyoptical comb instrument includes: a light intensity modulator (2), a radio frequency signal generator (3), first and second 2*2 optical couplers (31) and (32), an erbium-doped fiber amplifier (4), first and second distributed feedback Bragg lasers (51) and (52), first and second optical isolators (61) and (62), first and second semiconductor optical amplifiers (71) and (72), first and second optical circulators (81) and (82), first and second fiber gratings (91) and (92), a single-mode fiber (11), a third optical isolator (63) and a photoelectric detector (13).