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35results about How to "Bandwidth unchanged" patented technology

High bit rate and low range resolution of low sidelobe phase coded signal design method

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.
Owner:XIDIAN UNIV

Programmable gain amplifier applicable to transmitting end of communication system

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.
Owner:锐立平芯微电子(广州)有限责任公司

Wide-main-lobe phase coding signal and mismatch filter combined optimization method

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.
Owner:XIDIAN UNIV

Photoreceiver preamplifier circuit with high sensitivity and wide dynamic range

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.
Owner:HUAIYIN INSTITUTE OF TECHNOLOGY

Distributed MIMO (multiple-input multiple-output) radar orthogonal wide main lobe phase-coded signal design method

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.
Owner:XIDIAN UNIV +1

Mismatch filter optimization method of high-code-rate low-distance resolution phase coding signals

ActiveCN105044681ABandwidth unchangedReduced distance sidelobe levelsWave based measurement systemsVIT signalsPhase coding
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.
Owner:XIDIAN UNIV

Centralized MIMO radar waveform optimization method based on main lobe broadening

The invention provides a centralized MIMO radar waveform optimization method based on main lobe broadening, which is used for solving the problem of relatively high sidelobe level of angular domain signals existing in the prior art. The method comprises the implementation steps as follows: constructing a transmitting waveform matrix of a centralized MIMO radar system; calculating the angular domain signals; calculating a transmitting direction graph, and building an optimized objective function; carrying out autocorrelation and cross-correlation on the angular domain signals; building an optimized objective function of the autocorrelation sidelobe level and the cross-correlation level; building an optimized objective function of the autocorrelation main lobe level; building an optimized objective function of a main lobe broadening waveform of the centralized MIMO radar system; and acquiring a centralized MIMO radar waveform optimization result. According to the centralized MIMO radar waveform optimization method, the sidelobe level of the angular domain signals is reduced while the expected transmitting direction graph is matched.
Owner:XIDIAN UNIV

High-speed fully-differential noise reduction device for CMOS optical receivers

InactiveCN105471514AHigh bandwidthIncrease equivalent transconductanceElectromagnetic receiversCapacitanceLow noise
The invention discloses a high-speed fully-differential noise reduction device for CMOS optical receivers. The noise reduction device comprises a low-noise trans-impedance amplifier which is used for converting a current signal output by a photoelectric detector into a voltage signal and preliminarily amplifying the voltage signal and has low equivalent input noise current, a single-ended to differential circuit which is used for realizing conversion from single-ended to differential output, increasing the circuit bandwidth, amplifying the voltage signal, effectively reducing equivalent input noise current introduced by a back-end circuit and eliminating common-mode noise introduced by a power supply and the like, a two-stage three-order differential limiting amplifier which adopts a staggered active feedback and capacitance degeneration circuit and is used for amplifying the voltage signal to a voltage level needed for a digital processing unit, and an output buffer stage which is used for converting an output differential voltage signal into a single-ended output voltage signal. On the premise of keeping the overall gain and bandwidth of the circuit, the introduced noise is reduced, and the sensitivity of optical receivers is improved.
Owner:TIANJIN UNIV

Method and device for realizing load balancing

The invention discloses a method and a device for realizing load balancing. The method comprises the following steps: performing hash routing on a message for the first time to obtain a first member outlet, performing hash routing on the message for the second time through a backup group table if a link of the first member outlet is faulty, selecting other backup second member outlets except the first member outlet, and sending out the message from the second member outlet. According to the invention, load balancing is realized, the phenomena of message loss and packet loss are avoided, and the total bandwidth is kept unchanged.
Owner:苏州盛科科技有限公司

Method of message transmission, backbone switch and access switch

The invention provides a method of message transmission, a backbone switch and an access switch. The method comprises that when a communication link between a first backbone switch and a second backbone switch fails, the first backbone switch transmits a notification message to a first access switch, and the notification message is used for indicating the first access switch to divide a first V-shaped communication link in the same trunk among the first backbone switch, the second backbone switch and the first access switch into a second communication link and a third communication link in two trunks; the first backbone switch receives a response message transmitted by the first access switch; and the first backbone switch transmits a packet to the first access switch through the second communication link, so that the first access switch can transmit the packet to the second backbone switch through the third communication link. The embodiment of the invention can maintain the normal operation and non-splitting of an SVF system when the peer-link fails, thereby maintaining the same bandwidth of the SVF system.
Owner:HUAWEI DIGITAL TECH SUZHOU

Method and device for changing annealing furnace transmission system on line

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.
Owner:洛阳建材机械厂

Passive filter circuit and transmitting circuit

ActiveCN108736855ARealize the gain control functionBandwidth unchangedMultiple-port networksCapacitancePassive filtering
The invention discloses a passive filter circuit and a transmitting circuit. The passive filter circuit comprises a first selective circuit, a second selective circuit, a first capacitor and a first load. An input signal is connected into the input end of the first selective circuit, the first selective circuit comprises a plurality of first selective sub-circuits which are connected in parallel,and each first selective sub-circuit is suitable for being controlled to be switched on so as to transmit the input signal or being controlled to be switched off so as to stop transmitting the input signal. The input end of the second selective circuit is coupled with the output end of the first selective circuit, the second selective circuit comprises a plurality of second selective sub-circuitswhich are connected in parallel, and each second selective sub-circuit is suitable for being controlled to be switched on so as to transmit an output signal of the first selective circuit or being controlled to be switched off so as to stop transmitting the output signal of the first selective circuit. One end of the first capacitor is coupled with the output end of the first selective circuit. One end of the first load is coupled with the output end of the first selective circuit, and the other end of the first load is coupled with the other end of the first capacitor. According to the passive filter circuit and the transmitting circuit, gain control can be achieved in the passive filter circuit.
Owner:SPREADTRUM COMM (SHANGHAI) CO LTD

A high-voltage amplifier based on wireless data transmission isolation and its control method

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.
Owner:西安森领达电气信息有限公司

High-voltage amplifier based on wireless data transmission isolation, and control method thereof

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.
Owner:西安森领达电气信息有限公司

Method and apparatus for on-line replacement of annealing kiln drive system

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.
Owner:洛阳建材机械厂

Trellis coding modulation method applied to high-speed backplane chip-to-chip electrical interconnection system

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.
Owner:ZHEJIANG UNIV

Design method of low-sidelobe phase-encoded signal with high code rate and low range resolution

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.
Owner:XIDIAN UNIV

Adjustable high-frequency electromagnetic band gap band-pass filter

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.
Owner:JIANGNAN UNIV

Design method of quadrature wide main lobe phase encoding signal for distributed mimo radar

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.
Owner:XIDIAN UNIV +1

Passive filter circuit and transmitting circuit

ActiveCN108736855BRealize the gain control functionBandwidth unchangedMultiple-port networksCapacitanceSoftware engineering
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.
Owner:SPREADTRUM COMM (SHANGHAI) CO LTD
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