40results about How to "Fast frequency hopping" patented technology

A method of controlling a low power radio receiver including controlling the radio receiver for a first, relatively short, period of time to detect radio transmissions in a predetermined frequency band, and determining whether to control the radio receiver for a subsequent second relatively longer period of time to receive data from a subsequent radio transmission in the predetermined frequency band.

The invention discloses a multistandard I / Q (In-Phase / Quadrature-Phase) carrier generating device based on a fractional frequency-dividing frequency synthesizer. The device comprises a three-order differential loop filter (10), a preset module (11), a full-differential quadrature voltage-controlled oscillator (12), a switch type bumper (13), a continuous two-dividing frequency divider module (14), a multimode frequency divider (15), a frequency and phase discriminator / charge pump (16), a nonvolatile memory (17) and a digital processor (18). By utilizing the invention, the frequency can continuously cover the range from 0.7GHz to 6GHz by reasonable frequency distribution, and the rapid frequency hopping is realized by presetting the frequency by the digital processor with strong function.

The invention provides a frequency synthesizer capable of achieving low phase noise, low stray and quick change. An innovative phase noise prediction method is adopted, devices are reasonably selected, and the low phase noise is achieved; by means of phase-locked loop frequency presetting and microwave switch switching, frequency is quickly changed; meanwhile, a special isolation structure is adopted, reasonable distribution of the signal amplitude in a cavity structure is utilized, and accordingly low stray of the frequency synthesizer is guaranteed. The frequency synthesizer achieving multi-frequency output meets the requirements of the low phase noise, low stray and quick change.

The invention discloses a low-noise broadband frequency-hopping synthesizer, which adopts an interpolating frequency-mixing phase lock loop to reduce a frequency dividing ratio. The interpolating frequency-mixing phase lock loop divides reference source signals into two paths by a power divider to be respectively provided for a phase detection discriminator A and a phase detection discriminator B; the phase detection discriminator B, a low pass filter N, a voltage-controlled oscillator Q and a frequency divider constitute an interpolating local oscillator PLL; the interpolating local oscillator PLL provides point-frequency local-oscillation signals to perform down-conversion with the output of the frequency synthesizer; and the down-conversion performs output feedback to reduce the frequency dividing ratio and phase noise through the phase detection discriminator A. The low-noise broadband frequency-hopping synthesizer has the advantages of low noise, wide frequency range, high frequency-hopping speed, simple debugging and low cost.

The invention provides a broadband signal generator. The broadband signal generator is characterized by comprising a communication control module, an intermediate frequency processing module, an up and down frequency conversion module and a local oscillator module. The intermediate frequency processing module modulates various modes of modulating signals into central frequency and sends the signals to the first frequency conversion branch and the second frequency conversion branch, and then the signals are output at two frequency bands of 30-560 MHz and 560-1000 MHz after being frequency-converted twice by the local oscillator module. The broadband signal generator overcomes the problems of poor frequency accuracy, narrow frequency range, low reaction speed, less function and the like in the prior art and meanwhile improves the production efficiency and facilitates batch production.

The invention relates to a frequency agility synthesis method compatible with microwave large band width and mid-frequency small step and a device thereof. The invention is characterized in that direct simulation type frequency synthesis, direct digital frequency synthesis, and DSP(digital signal processor) technology are combined to perform frequency synthesis, so as to make the best of the advantages of the mentioned technologies, avoid technical defects, realize the optimization of all technical indexes of the frequency synthesizer, has a better expandability on the design of frequency band width and at the same time is compatible with large band width microwave frequency agility and mid-frequency small stepping frequency agility signal functions.

The embodiment of the invention discloses a communication method and device and a computer storage medium. The communication method comprises configuring, for a user equipment (UE), the frequency hopping configuration information corresponding to one or more bandwidth parts (BWPs), the frequency hopping configuration information being associated with a frequency hopping pattern employed for frequency hopping on the one or more BWPs; and carrying the frequency hopping configuration information on a BWP switching command or an awakening signal and sending the BWP switching command or the awakening signal to the UE.

The invention relates to a hopping frequency synthesizer for a front end of a millimeter wave holographic imaging system, which consists of a multipath phase-locked loop, a single-pole multi-throw switch, a frequency multiplier and a singlechip. The singlechip controls the frequency hopping of the multipath phase-locked loop and the on or off of the single-pole multi-throw switch. The multipath phase-locked loop comprises N single-path phase-locked loops, the N paths are more, the frequency conversion time of the whole frequency hopping source is shorter, and the frequency hopping time of the N paths of phase-locked loops is one Nth of that of the single path loop. The single-path phase-locked loop comprises a crystal oscillator, a frequency and phase detector, a filter, a voltage-controlled oscillator and a power divider, wherein the input of the frequency and phase detector is connected with the crystal oscillator and the feedback signal which is provided by the voltage-controlled oscillator, the output of the frequency and phase detector is connected with the filter, the power divider divides the output of the voltage-controlled oscillator into two paths, one path is output to the single-pole multi-throw switch, and the other path is fed back to the frequency and phase detector. The hopping frequency synthesizer outputs the wideband millimeter wave signals of 24 GHz-36GHz.

The invention relates to a short-wave pre-and-post-selector, which comprises a digital control circuit, transmitting-receiving switching circuits, band switching circuits, frequency hopping filters, a decoder, a broadband low noise amplifier and a receiving protection circuit, wherein the digital control circuit is electrically connected with an external short-wave radio station control unit through a control interface; serial codes sent by the short-wave radio station control unit are received by the digital control circuit and converted into parallel tuning codes respectively used for controlling the frequency hopping filters, the band switching circuits and the transmitting-receiving switching circuits so as to realize transmission on carrier signals different in frequency point and rapidly perform switching on carrier frequencies of useful signals; the transmitting-receiving switching circuits comprise a first transmitting-receiving switching circuit, a second transmitting-receiving switching circuit, a third transmitting-receiving switching circuit and a fourth transmitting-receiving switching circuit; the band switching circuits comprise a first band switching circuit and a second band switching circuit; the frequency hopping filters comprise a first frequency hopping filter and a second frequency hopping filter. The short-wave pre-and-post-selector disclosed by the invention has the advantages of being reasonable in structure, stable and reliable to use, strong in anti-jamming capability, low in cost, simple to control, fast in frequency hopping speed, low in power consumption, small in bottom noise and the like.

The invention belongs to the communication technological field and relates to a multi-carrier direct sequence spread spectrum code division multiple access (MC-DS-CDMA) and FFH (fast frequency hopping)-OFDM (orthogonal frequency division multiplexing)-based multi-carrier spread spectrum technology, in particular, a fast frequency hopping-based multi-carrier spread spectrum method. According to the method, the common features of MC-DS-CDMA and FFH-OFDM are considered, and the weakness of the inexistence of frequency diversity gain of a traditional MC-DS-CDMA is avoided. The fast frequency hopping-based multi-carrier spectrum spreading method is advantageous in fading resistance, interference resistance, code division multiple access and communication confidentiality.

The invention discloses a high performance frequency synthesizer comprising a power divider; a direct frequency synthesis module which receives the output signal of the power divider and outputs a local oscillation signal and a direct digital frequency synthesis module which receives the output signal of the power divider and accordingly outputs an intermediate frequency signal; a frequency mixing module which is used for receiving the local oscillation signal and the intermediate frequency signal and performs frequency mixing of the two signals to output a low phase noise and fast frequency hopping signal; a switch filtering module which is used for receiving the output signal of the frequency mixing module and filtering the signal; a frequency multiplication module which is used for receiving and shifting the frequency spectrum of the signal outputted by filtration of the switch filtering module and finally expanding to the C-band to output frequency multiplication signal power; and an amplification module which is used for receiving and amplifying and adjusting the frequency multiplication signal power so as to adjust the power flatness in the whole band. Effective integration is performed by the mode of combining the two frequencies, and the output signal of the integrated frequency synthesizer is enabled to be low in phase noise, low in stray and fast in frequency hopping speed.

The invention discloses a broadband low-stepping high-speed frequency synthesizer based on a DDS (Direct Digital Synthesizer) and a PLL (Phase Locked Loop). The frequency synthesizer comprises a DDS circuit, a PLL circuit, an up-conversion and signal amplification circuit and a time sequence control circuit, wherein the signal output end of the PLL circuit is connected with the signal input end of the upper-conversion and signal amplification circuit; the signal input end of the up-conversion and signal amplification circuit is connected with the signal output end of the DDS circuit; and the signal output end of the time sequence control circuit is connected with the signal input ends of the PLL circuit and the DDS circuit. According to the broadband low-stepping high-speed frequency synthesizer, L-band and KU-band local oscillations are generated through the PLL circuit in a large bandwidth and combined with a DDS frequency respectively, and frequency switching is realized through a high-speed switch combination method. An output frequency is on a KU band; frequency hopping of 10MHz stepping can be finished rapidly when an output bandwidth is 12-14GHz; and the overall frequency switching time is up to 2 microseconds. The broadband low-stepping high-speed frequency synthesizer has the characteristics of simple structure, high stability, high accuracy, easiness in implementation and the like.

An APP music intelligent lamp capable of light adjustment and toning comprises a mobile phone APP module, a Bluetooth communication module, a digital-to-analog converter, a PWM control module and a LED lamp, the LED lamp is a RGB LED lamp, the mobile phone APP module is in wireless connection with the Bluetooth communication module, the Bluetooth communication module is connected with the digital-to-analog converter, the digital-to-analog converter is connected with the PWM control module, the PWM control module is connected with the LED lamp, the Bluetooth communication module employs the Bluetooth frequency hopping algorithm and the mobile phone APP module to perform data transmission, the Bluetooth frequency hopping algorithm writes in the mobile phone APP and the Bluetooth communication module, and the PWM control module adjusts the color and the brightness of the LED lamp through changing of the duty ratio of the LED lamp. The APP music intelligent lamp capable of light adjustment and toning can directly perform back-calculation of a corresponding duty ratio of a required LED light through inputting corresponding parameters through the algorithm chip and circuit and perform dynamic adjusting of the color and the illumination in the condition of adjusting the duty ratio, the PWM light adjustment is more accurate in light adjustment, faster in color changing, more beautiful in color of light adjustment and more color changing in the light adjustment mode compared to a traditional mode.

The invention discloses a high-quality and fast-frequency-hopping TDD wireless transceiving system. The system comprises a baseband signal processing module, a first frequency synthesis module and a second frequency synthesis module; the transmitting end and the output end of the baseband signal processing module are connected to a transmitting circuit frequency mixer and a receiving circuit frequency mixer respectively; a first radio-frequency switch is arranged between the first frequency synthesis module and the second frequency synthesis module; and the input selection end of the first radio-frequency switch is electrically connected with the first frequency synthesis module and the second frequency synthesis module. The invention relates to the technical field of wireless communication systems, in particular to the high-quality and fast-frequency-hopping TDD wireless transceiving system. While one frequency synthesizer module works, the other frequency synthesizer module can enteranother frequency point working state in advance, and when ready, a path is switched by controlling the radio-frequency switch, thereby achieving the purposes of quickly switching a frequency and stably outputting a local oscillator signal.

The invention relates to a quick configuration method for an LTE (Long Term Evolution) SRS (Sounding Reference Signal) frequency domain position. Fixed frequency band channel sounding can prove a situation as shown by the accompanying drawing during uplink channel sounding at a fixed frequency domain position and a situation that channel sounding through a frequency hopping method is performed through a subprogram A, a subprogram B and a subprogram C. The invention provides a simplified algorithm and the calculation of n1, n2 and n3 is avoided; in the frequency hopping method, the algorithm can also improve the hop frequency of UE (User Equipment) channel sounding and can bring about uplink scheduling gains.

The invention provides an APP smart lamp. The smart lamp includes a cell phone APP module, a Bluetooth communication module, a digital analog converter, a PWM control module and an LED lamp. The cell phone APP module is in wireless connection with the Bluetooth communication module. The Bluetooth communication module is connected with the digital analog converter. The digital analog converter is connected with the PWM control module. The PWM control module is connected with the LED lamp. The Bluetooth communication module outputs signals to the PWM control module via the digital analog converter after receiving control signals of a cell phone APP. The Bluetooth communication module adopts a Bluetooth frequency hopping algorithm for performing data transmission with the cell phone APP module. Frequency bands are divided into a plurality of frequency hopping channels according to the frequency-hopping spread spectrum. In one connection process, a radio transceiver hops on and on from one channel to another according to a specific code sequence. Only a sending party and a receiving party perform communication according to the above rule while other interference source cannot perform interference according to said rule. Therefore, the Bluetooth system is more stable in communication connection, higher in communication rate and more insusceptible to interference and decoding compared with other systems.

The invention relates to an internal self-test system of a short-wave prognosis selector, comprising an FPGA control circuit and a pre / post-selector filter circuit electrically connected with the FPGAcontrol circuit. The FPGA control circuit is electrically connected with a main control unit of an external short-wave radio station through a control interface. The system is characterized in that the self-test system further comprises a self-test signal shaping circuit, a conversion circuit and a self-test signal testing circuit electrically connected with the FPGA control circuit. The internalself-test system of the short-wave prognosis selector of the invention is simple in structure, reasonable in design, small in volume, low in cost, fast in speed, high in reliability, fast in frequency hopping speed, low in power consumption, low in noise, good in frequency selectivity, stable and reliable in operation, and can effectively improve the technical index and electromagnetic compatibility of the short-wave radio station.

Disclosed is an APP music intelligent lamp. The APP music intelligent lamp comprises a music signal collection module, a signal processing module, a mobile phone APP module, a Bluetooth communication module, a digital analog converter, a PWM control module and an LED lamp, wherein the mobile phone APP module is in wireless connection with the Bluetooth communication module; the Bluetooth communication module is connected with the digital analog converter; the digital analog converter is connected with the PWM control module; the PWM control module is connected with the LED lamp; the Bluetooth communication module receives a control signal from a mobile phone APP and then outputs a signal to the PWM control module through the digital analog converter; the Bluetooth communication module and the mobile phone APP module are in data transmission by adopting a Bluetooth frequency hopping algorithm; by adoption of a frequency hopping technology, a frequency band is divided into multiple frequency hopping channels; and in one time of connection. a radio transceiver performs frequency hopping from one channel to another constantly based on a certain code sequence; only the receiving and transmitting sides can communicate according to the rule, and other interference sources cannot generate interference according to the same rule, so that compared with other system, the Bluetooth system is more stable in communication connection, higher in communication speed and is not subjected to interference and cracking easily.

The invention relates to a nine-channel space spectrum super-resolution estimation monitoring and direction-finding mobile station system, which comprises a small double-cone omnidirectional monitoring antenna, a nine-unit direction-finding antenna, an amplifier, a monopole monitoring antenna, a nine-channel signal switching module, a filter combiner, am amplifier module, a nine-channel receiver, a monitoring and direction-finding controller, a DSP (Digital Signal Processor) processing module, an imbedded industrial computer, a GPS (Global Positioning System) antenna, a GPS module, a 3G (3rd Generation) antenna, a 3G router, a power supply module, a remote control unit, an exchanger, and the like. The system has the following advantages: the system achieves remote and automatic monitoring and direction-finding of radio signals; an imbedded computer system is integrally arranged so that the structure is compact and light; a direction-dinging assembly solves the coupling problem between the antenna arrays and prevents coupling and phase between unit antennas from being blurred; the structure is compact and light, and the spanning maintenance is convenient; the grid connection is flexible, and can support different wired / wireless network data transmissions; moreover, collection, compression coding, automatic task monitoring, statistic analysis and abnormal state alarm of wireless signals are realized.

The invention discloses a multistandard I / Q (In-Phase / Quadrature-Phase) carrier generating device based on a fractional frequency-dividing frequency synthesizer. The device comprises a three-order differential loop filter (10), a preset module (11), a full-differential quadrature voltage-controlled oscillator (12), a switch type bumper (13), a continuous two-dividing frequency divider module (14), a multimode frequency divider (15), a frequency and phase discriminator / charge pump (16), a nonvolatile memory (17) and a digital processor (18). By utilizing the invention, the frequency can continuously cover the range from 0.7GHz to 6GHz by reasonable frequency distribution, and the rapid frequency hopping is realized by presetting the frequency by the digital processor with strong function.

The millimeter wave frequency agility frequency source comprises a phase-locked source module, a five-frequency-division module, a primary frequency conversion filtering module, a quadruplicated frequency module, a secondary frequency conversion filtering module, a clock module and a control module. The phase-locked source module outputs three paths of signals, the first path of output is connected with the primary frequency conversion module, the second path of output is connected with the five-frequency-division module, the third path of output is connected with the quadruplicated frequency module, the output of the five-frequency-division module is connected with the primary frequency conversion module, and the output of the clock module is connected with the quadruplicated frequency module. And the output of the quadruplicated frequency module and the primary frequency conversion module is connected with the secondary frequency conversion module to output millimeter wave signals through secondary frequency conversion. The millimeter wave frequency agility frequency source overcomes the defects that a traditional millimeter wave frequency agility frequency source is complex in typesetting design, large in debugging difficulty, large in size and not suitable for miniaturization and integration requirements of missile-borne electronic interference equipment.

The invention discloses a self-accelerating locked phase-locked loop, which comprises a frequency and phase detector, a charge pump, a low-pass filter, a voltage-controlled oscillator, a frequency divider, a rectifier, a filter, and a bandwidth control circuit. The frequency and phase detector, the charge pump, the low-pass filter, and the voltage-controlled oscillator are connected in sequence, and the output of the voltage-controlled oscillator is fed back to one input terminal of the frequency and phase detector through the frequency divider, and the other of the frequency and phase detector One input terminal is connected to a reference frequency source. The output terminal of the frequency and phase detector is also connected to the input terminal of the rectifier, and the rectifier, filter, and bandwidth control circuit are connected in sequence, and the bandwidth control circuit is used to generate a control word signal proportional to the output signal of the frequency and phase detector and input it to the low The pass filter controls the number of capacitors connected in the parallel capacitor array of the low-pass filter to control the bandwidth, so as to realize the accelerated locking of the phase-locked loop to the reference frequency.

The invention belongs to the technical field of communication, and in particular relates to a multi-carrier spread spectrum technology based on multi-carrier direct sequence spread spectrum code division multiple access (MC-DS-CDMA) and FFH-OFDM. A multi-carrier spread spectrum method based on fast frequency hopping, which takes into account the common characteristics of MC-DS-CDMA and FFH-OFDM, avoids the weakness of traditional MC-DS-CDMA without frequency diversity gain, and is effective in anti-fading, It has certain advantages in anti-interference, code division multiple access, and communication confidentiality.

The invention discloses a self-acceleration locking phase-locked loop, and the phase-locked loop comprises a phase frequency detector, a charge pump, a low-pass filter, a voltage-controlled oscillator, a frequency divider, a rectifier, a filter and a bandwidth control circuit. The phase frequency detector, the charge pump, the low-pass filter and the voltage-controlled oscillator are sequentially connected; the output of the voltage-controlled oscillator is fed back to one input end of the phase frequency detector through the frequency divider, and the other input end of the phase frequency detector is connected with the reference frequency source. The output end of the phase frequency detector is further connected with the input end of the rectifier, the rectifier, the filter and the bandwidth control circuit are sequentially connected, and the bandwidth control circuit is used for generating a control word signal in proportional relation with an output signal of the phase frequency detector and inputting the control word signal to the low-pass filter; the bandwidth is controlled by controlling the access number of capacitors in the parallel capacitor array of the low-pass filter, so that the phase-locked loop accelerates to lock the reference frequency.

The invention relates to a short-wave pre-and-post-selector, which comprises a digital control circuit, transmitting-receiving switching circuits, band switching circuits, frequency hopping filters, a decoder, a broadband low noise amplifier and a receiving protection circuit, wherein the digital control circuit is electrically connected with an external short-wave radio station control unit through a control interface; serial codes sent by the short-wave radio station control unit are received by the digital control circuit and converted into parallel tuning codes respectively used for controlling the frequency hopping filters, the band switching circuits and the transmitting-receiving switching circuits so as to realize transmission on carrier signals different in frequency point and rapidly perform switching on carrier frequencies of useful signals; the transmitting-receiving switching circuits comprise a first transmitting-receiving switching circuit, a second transmitting-receiving switching circuit, a third transmitting-receiving switching circuit and a fourth transmitting-receiving switching circuit; the band switching circuits comprise a first band switching circuit and a second band switching circuit; the frequency hopping filters comprise a first frequency hopping filter and a second frequency hopping filter. The short-wave pre-and-post-selector disclosed by the invention has the advantages of being reasonable in structure, stable and reliable to use, strong in anti-jamming capability, low in cost, simple to control, fast in frequency hopping speed, low in power consumption, small in bottom noise and the like.

The invention discloses a multimode microwave detection system and method based on a fast frequency hopping technology, and belongs to the technical field of microwave sensor detection. The system comprises a frequency sweeping local oscillation reference circuit LO1, a frequency hopping reference local oscillation circuit LO2, a frequency mixing circuit, a microwave sensor with a plurality of resonant membranes, a radio frequency detection circuit and a corresponding control circuit, through the two reference local oscillators and the frequency mixer, rapid frequency sweeping of a working interval of each resonant mode is realized, frequency hopping processing is carried out on irrelevant frequency bands, and the contradiction between real-time performance and aliasing problems in a multimode microwave detection technology is solved; based on the multi-mode microwave detection system, a detection circuit and a detection algorithm are used to realize rapid extraction of single-resonance-mode microwave parameters. Rapid frequency hopping and frequency sweeping of a microwave device in a wide frequency interval are achieved, low stray and phase noise levels are maintained, and the real-time performance and accuracy of microwave detection are guaranteed.

The invention discloses a frequency generating device comprising: a base frequency generating circuit, used to generate a reference frequency; a frequency synthesis circuit, connected to the base frequency generation circuit, used to generate a corresponding synthesized frequency according to the configuration parameters of the reference frequency and the frequency synthesis circuit; Frequency; frequency extraction circuit, connected with frequency synthesis circuit, used to extract high-order image frequency from synthesized frequency; phase-locked loop circuit, connected with frequency extraction circuit, used for configuration parameters according to high-order image frequency and phase-locked loop circuit Output the corresponding output frequency. The invention also discloses a frequency generating method. Through the above method, the present invention can reduce phase noise and spurs while realizing fast frequency hopping and high frequency resolution.

The invention discloses a radio frequency passive resonance sensing characteristic demodulation conversion circuit and relates to the technical field of wireless sensor conversion demodulation testing. The conversion circuit comprises an excitation source, a power distributor and an amplitude-phase receiving unit. The excitation source is divided into a plurality of paths through the power distributor and input to corresponding modules in the amplitude-phase receiving unit. The amplitude-phase receiving unit is used for down-converting a measured signal to an intermediate frequency signal, outputting the signal and sending the signal to a signal conditioning and quantization acquisition module at the back end. Then the signal is converted into discrete time-domain signals for processing atthe back end. The conversion circuit has the advantages of wide output frequency range, high frequency hopping speed, low phase noise, high frequency resolution, high frequency sweeping period, shortresponse time, etc.