44 results about "Single side band" patented technology

A UE may measure a signal strength or signal quality of a serving cell. The UE may select whether to use an LP-WUR, a main radio, or both the LP-WUR and the main radio for signal monitoring based on the measured signal strength or signal quality of the serving cell. The signal monitoring may be associated with at least one of WUS monitoring, SSB monitoring, or RRM measurement. The signal strength or the signal quality of the serving cell may be measured using the main radio. The UE may receive an indication of at least one threshold from a network node. Whether to use the LP-WUR, the main radio, or both the LP-WUR and the main radio for the signal monitoring may be selected based further on the at least one threshold.

1. The name of the design product: track (single sideband arc height track). 2. The use of the design product: used as a honeycomb curtain installation accessory. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view.

Overlaid frequency-domain reflection modulation is described. An apparatus is configured to shift a first order harmonic, with respect to an associated transmission signal, to a shifted frequency-domain position. The apparatus is configured to encode, based on the shifted frequency-domain position, an information bit over time-domain modulated information to generate an overlaid modulation information bit. The apparatus is configured to transmit, for a receiver and in accordance with a single sideband reflection, the overlaid modulation information bit. Another apparatus is configured to receive, from a transmitter and in accordance with a single sideband reflection, an overlaid modulation information bit based on a shifted first order harmonic, of an associated transmission signal, at a shifted frequency-domain position. The apparatus is configured to decode, based on the shifted frequency-domain position for the shifted first order harmonic, the overlaid modulation information bit in association with time-domain modulated information to generate an information bit.

Embodiments of the present disclosure relate to methods and apparatuses for sidelink synchronization signal block (S-SSB) transmission in unlicensed spectra. According to an embodiment of the present disclosure, a user equipment (UE) can include: a processor configured to: obtain configuration information for S-SSB in an unlicensed spectrum based on configuration or pre-configuration, wherein the configuration information includes condition (s) for determining a channel access failure prior to a target S-SSB occasion based on a listen before talk (LBT) type 1 procedure; perform a first LBT type 1 procedure associated with a first S-SSB occasion to initiate a first S-SSB channel occupancy starting from the first S-SSB occasion; and perform at least one of the following operations in response to determining a channel access failure prior to the first S-SSB occasion based on the first LBT type 1 procedure and the configuration information: performing a second LBT type 1 procedure associated with a second S-SSB occasion next to the first S-SSB occasion to initiate a second S-SSB channel occupancy starting from the second S-SSB occasion; continuing to perform the first LBT type 1 procedure prior to the second S-SSB occasion to initiate a second S-SSB channel occupancy starting from the second S-SSB occasion; or performing a first LBT type 2 procedure; a transmitter coupled to the processor and configured to transmit an S-SSB on the first S-SSB occasion in response to a channel being available for access prior to the first S-SSB occasion based on the first LBT type 1 procedure; and a receiver coupled to the processor.

An electronic device applies a frequency offset function to a first signal having a first frequency. The device includes a delay element configured to output a second signal corresponding to the first signal delayed by a duration equal to a first period of said signal divided by four. A circuit branch includes a first circuit configured to divide the frequency of the first signal by a given number coupled in series with a second circuit configured to implement an integration. The circuit branch outputs a third signal and a fourth signal. A single side band mixing circuit processes the first signal, second signal, third signal and fourth signal to generate an output signal.

To provide a measuring device that can measure the characteristics of a coherent receiver separately from the characteristics of a transmitter, without the need to measure the characteristics of the transmitter in advance. [Solution] The measuring device according to the present disclosure comprises: a conversion unit that converts a single-sideband signal affected by the transmission characteristics of a transmitter into a first electrical signal; a receiving unit that coherently receives the single-sideband signal; and a measuring unit that uses a second electrical signal generated by coherently receiving the first electrical signal to determine the transmission characteristics and the receiving characteristics of the receiving unit.

Embodiments of the present disclosure relate to methods and apparatuses for sidelink synchronization signal block (S-SSB) transmission in an unlicensed spectrum. According to an embodiment of the present disclosure, a user equipment (UE) can include: a processor configured to: obtain configuration information for S-SSB in an unlicensed spectrum based on configuration or pre-configuration, wherein the configuration information includes at least one of the following: a first configuration associated with a time interval between adjacent S-SSB occasions sharing a same channel occupancy time (COT); a second configuration for performing listen before talk (LBT) type 2; or a third configuration for performing LBT type 1; and perform an LBT procedure associated with an S-SSB occasion based on the configuration information; a transmitter coupled to the processor and configured to transmit an S-SSB on the S-SSB occasion in response to the LBT procedure being successful; and a receiver coupled to the processor.

The invention provides a signal generation system. The signal generation system comprises an external modulation laser, an optical splitter, a Mach-Zehnder modulator, a phase shifter, an attenuator, a coupler and a photoelectric conversion unit. According to the invention, Mach-Zehnder modulation is carried out on optical carriers through asymmetric double single side band signals, and millimeter wave / terahertz signals in the form of optical signals are obtained through destructive interference between output signals of a phase shifter and an attenuator and optical signals subjected to Mach-Zehnder modulation. And finally, millimeter wave / terahertz signals in an electric signal form are obtained through the photoelectric conversion unit. Millimeter wave / terahertz signals are generated by adopting a single push-pull Mach-Zehnder modulator and attenuator optical double-single-side-band modulation, transmitter precoding and a complex and expensive I / Q modulator are avoided, the complexity and cost of the system can be effectively reduced, meanwhile, the frequency interval can be flexibly adjusted, and the system performance is improved. And the tunable range of the system is increased.

The present invention provides a single sideband signal generator, comprising: a modulator configured to generate a first modulated optical signal and a second modulated optical signal having the same amplitude; and the sideband suppression light circuit based on the first light delay line is used for generating a full-carrier single-side-band signal, and / or the sideband suppression light circuit based on the second light delay line is used for generating a carrier-suppressed single-side-band signal. The present invention simplifies the structure by saving half the space occupied by redundant signal electrodes, and also reduces the RF power consumption by half by removing an RF mixer. The provided single side band (SSB) signal generator has the advantages of compact structure, low cost and energy conservation. By reasonably designing the length of the optical delay line, the generator can be easily expanded to a higher frequency range on the premise of not needing extra cost.

Receiving device, comprising: a frequency mixer (11) configured to mix a received signal input therein and a local signal generated by a local oscillator (12) in order to convert a frequency of the received signal into a baseband; an envelope demodulator (13) configured to perform an envelope demodulation of an output of the frequency mixer (11); an upper sideband demodulator (14) configured to demodulate only one upper sideband of an output from the frequency mixer (11) by single-sideband demodulation; a lower sideband demodulator (15) configured to demodulate only one lower sideband of the output from the frequency mixer (11) by single-sideband demodulation; a first adder (16) configured to add an output from the envelope demodulator (13) and a first inverted output obtained by inverting an output from the upper sideband demodulator (14); a second adder (17) configured to add the output from the envelope demodulator (13) and a second inverted output obtained by inverting an output from the lower sideband demodulator (15); and a third adder (18) configured to add the output from the envelope demodulator (13), a third inverted output obtained by inverting an output from the first adder, and a fourth inverted output obtained by inverting an output from the second adder to produce a demodulation signal.

A method performed by a user equipment (UE) in a wireless communication system includes receiving synchronization signal / physical broadcast channel block (SSB) based on a channel bandwidth. The SSB is received in a resource region based on 240 contiguous subcarriers within four orthogonal frequency division multiplexing (OFDM) symbols. Based on the channel bandwidth being 3 MHz, the SSB is received in a resource region within the four OFDM symbols in which some of the 240 contiguous subcarriers are punctured. The resource region includes 12 resource blocks (RBs).

The application relates to a kind of optical and millimeter wave fusion bidirectional transmission system and method based on optical heterodyne, and belongs to the technical field of space optical communication.The application generates single sideband optical signal by means of optical heterodyne method, provides single sideband light source with carrier for space optical link and millimeter wave link, realizes multiplexing of relevant devices between the transmitting end of two links, between the receiving end and between the receiving end of space optical link and the transmitting end of millimeter wave link, and reduces the structural complexity of fusion bidirectional system.The transmission system can be divided into isomorphic bidirectional transmission mode and heterogeneous bidirectional transmission mode.In isomorphic bidirectional transmission mode, photodetector is time division multiplexed by space optical link and millimeter wave link.In heterogeneous bidirectional transmission mode, two light signals sharing photodetector completely overlap in frequency domain, and the decomposition of two signals is realized by prior information method.The application reduces the structural complexity of system by device multiplexing design, and promotes the development of fusion transmission in space-based and air-based network.

The invention belongs to the technical field of optical communication, and particularly discloses an optical fiber-visible light converged communication system for transmitting end signal reverse probabilistic shaping. According to the method, carrier waves are injected into a base band, a single side band signal is formed, a KK receiving scheme meeting the minimum phase condition is combined with an RPS strategy of distributing constellation probability to an outer ring, efficient and steady recovery of a mixed link receiving signal under the conditions of low signal-to-noise ratio and limited peak power is achieved, and the method has the advantages of being simple in structure and convenient to operate. And the phase reconstruction reliability is improved by setting a proper carrier signal power ratio. The method overcomes the defects of insufficient stability of peak constraint and phase recovery when strong carrier waves and low signal-to-noise ratio coexist in a traditional direct detection link and high peak-to-average power ratio and aggravated mutual information degradation of conventional probability shaping under the low signal-to-noise ratio, has higher noise immunity and spectral efficiency, and can be applied to the field of wireless communication. The method is a feasible scheme for a 6G indoor optical wireless access and optical fiber wireless optical integrated network.

The invention discloses an ultra wide band radio frequency signal frequency measurement system and method based on wavelength coding, and belongs to the field of radio frequency signal frequency measurement. According to the invention, by means of the high-precision wavelength encoder, the equivalent radio frequency range of 20THz can be covered in single sampling; a wavelength encoder with complex spectral response and an advanced reconstruction algorithm compress the minimum distinguishable frequency difference to 125MHz, and high-precision frequency measurement is considered while the broadband is kept; the electro-optical modulator supports a carrier suppression single side band modulation scheme of broadband signals and can be recovered at one time at the same time; modulation, coding, detection and digital processing can be completed in the same chip or in the same package, an off-chip optical fiber compensation or high-power temperature control loop is not needed, and the size and power consumption are remarkably reduced. According to the invention, the technical problem that multi-frequency real-time measurement, high resolution and high bandwidth cannot be considered at the same time is solved, and the method is applied to high-resolution and ultra-wideband real-time measurement of multi-tone broadband radio frequency signals.

This invention provides a sensitivity-enhanced temperature measurement device based on an optoelectronic oscillator, comprising: a laser, an intensity modulator, a delay line interferometer, a sensitive arm fiber optic unit located in the space where the signal to be measured is located, a reference arm fiber optic unit, a photodetector, a microwave amplifier, a bandpass filter, a power divider, and a frequency measurement section. The intensity modulator generates an optical signal containing two frequency components: a carrier wave f0 and a first-order single-sideband wave f1. The delay line interferometer then separates these two frequency components, allowing them to propagate separately along the reference arm and sensitive arm fibers. These components are then returned to the delay line interferometer and combined to output an optical signal whose phase contains the temperature signal to be measured. The phase change of the optical signal caused by the temperature signal to be measured is then converted into a frequency change in the microwave signal output by the optoelectronic oscillator. This invention also provides a sensitivity-enhanced temperature measurement method. The device provided by this invention can effectively improve the sensitivity of temperature detection.

The invention discloses an optical carrier suppression single side band modulation device and method based on a variable optical coupler. The device comprises a laser, a first adjustable optical coupler, an optical single side band modulation module, a second optical phase shifter and a fourth adjustable optical coupler. And the first adjustable optical coupler divides the optical carrier into two paths according to a preset proportion, and the two paths are respectively input into the optical single side band modulation module and the second branch, so that the power matching of the two paths of carriers is ensured. The optical single side band modulation module comprises a second adjustable optical coupler, a first optical phase shifter and a third adjustable optical coupler, and accurate splitting ratio control and phase adjustment are achieved. And the second optical phase shifter performs phase adjustment on the second branch optical carrier to enable the second branch optical carrier to be opposite to the carrier phase in the modulation signal, and a high-purity optical carrier suppression single side band signal is output through combination of a fourth adjustable optical coupler. According to the invention, through cooperative configuration of the multi-stage adjustable device, process errors are effectively overcome, the carrier-to-sideband suppression ratio and the system power efficiency are improved, and the method can be applied to the fields of radio over fiber communication and the like.

The present disclosure relates to a device and a communication method with which it is possible to perform appropriate filtering / image suppression when single side band modulation is used for D2R transmission of an A-IoT device. A device that has a lower complexity than an NB-IoT device comprises: a transmission unit that transmits to a wireless base station by using single side band modulation; and a control unit that selects either an upper side band or a lower side band in the single side band modulation, and uses the selected side band to perform transmission control of a transmission signal to the wireless base station.

The invention provides a training method of a signal modulation identification model, and a signal modulation identification method and device. The method comprises the following steps: collecting sample single side band signals of a sample communication signal in a plurality of modulation modes; extracting a sample high-order cumulant feature of the sample single-side-band signal in any modulation mode, and determining a sample modulation signal feature according to the sample high-order cumulant feature; performing modulation mode prediction on the sample modulation signal features by adopting a signal modulation identification model to obtain prediction labels of the sample modulation signal features; wherein the prediction label is used for indicating a prediction modulation mode corresponding to the sample modulation signal feature; according to the method, the signal modulation identification model is trained according to the difference between the predicted modulation mode and any modulation mode, so that the signal modulation identification model can be accurately trained, and the modulation mode of the communication signal can be accurately and efficiently identified based on the signal modulation identification model obtained through training.

The invention discloses a high-dynamic high-sensitivity communication ranging integrated device and method based on homodyne simulation coherence. The device comprises a hardware phase frequency detection module, a temperature tuning module, a digital phase locking module, a single sideband radio frequency modulation module, an adjustable optical filtering module and a cooperative control module. After receiving signal light and local oscillation light are subjected to frequency mixing through a 90-degree optical mixer, a hardware XOR phase frequency detector detects carrier frequency difference and phase difference in real time; a cooperative control module in the FPGA performs multi-dimensional cooperative control on temperature tuning, DDS frequency, single side band radio frequency modulation and an optical filter, and + / -6GHz large-range Doppler compensation and high-precision carrier tracking are realized. A communication data frame is embedded in distance measurement, a GTX high-speed transceiver is used for configuring an independent high-precision clock and a phase four-diversity technology to realize picosecond-level time measurement, and communication and distance measurement integration is completed. The device supports 10Gbps / 5Gbps / 2.5 Gbps / 1.25 Gbps multi-rate switching, integrates radiation protection reinforcement, and is suitable for an inter-satellite high-dynamic laser communication ranging scene.

Embodiments of the present disclosure relate to methods and apparatuses for sidelink (SL) transmission and sidelink synchronization signal block (S-SSB) transmission in unlicensed spectra. According to an embodiment of the present disclosure, a user equipment (UE) can include: a processor configured to: obtain slot structure information for an unlicensed spectrum based on configuration or pre-configuration, wherein the slot structure information includes at least one of the following: a first set of starting symbols for SL transmission; a second set of starting symbols and a duration for S-SSB occasion (s); or time domain information indicating whether a slot includes S-SSB occasion (s) or not; and perform a channel access procedure to initiate a channel occupancy time (COT) for SL transmission based on the slot structure information, wherein the COT includes a plurality of consecutive slots; a transmitter coupled to the processor; and a receiver coupled to the processor.

The invention discloses a photon terahertz communication system based on differential Delta-Sigma modulation and independent double single side bands, and belongs to the field of terahertz communication. The system specifically comprises a transmitting end and a receiving end, a TX-DSP module of the transmitting end generates two paths of independent high-order baseband signals by applying differential DSM and independent double single side band technologies, drives an IQ modulator to modulate an input optical carrier, and obtains a terahertz signal by using a photon beat frequency method; the method comprises the following steps: transmitting a QAM sequence to an RX-DSP module at a receiving end through a single-mode optical fiber, carrying out resampling and digital down conversion to obtain two QPSK signals, respectively carrying out matched filtering, QPSK digital signal processing, hard decision, differential DSM demodulation and low-pass filtering to obtain two DMT signals, carrying out DMT demodulation again, carrying out FFT by removing a cyclic prefix, and converting a time domain signal back to a frequency domain to obtain an original QAM sequence; and the QAM sequence is demapped and recovered into an original binary information sequence. According to the invention, high-order modulation is realized, and the bit error rate performance is excellent.

Apparatuses and methods for multiplexing between always-on and on-demand synchronization signal blocks (SSBs). A method includes receiving a set of higher layer parameters, determining, based on the set of higher layer parameters, configurations for first and second sets of synchronization signals and physical broadcast channel (SS / PBCH) blocks, and identifying, based on the configurations, first and second frequency locations for the first and second sets of SS / PBCH blocks, respectively. The method further includes determining that the first set of SS / PBCH blocks is associated with a system information block 1 (SIB1), the first frequency location corresponds to a global synchronization channel number (GSCN) of an entry from a set of synchronization raster entries, the second set of SS / PBCH blocks is not associated with the SIB1, and the second frequency location does not correspond to a GSCN of any synchronization raster entry from the set of synchronization raster entries.

The invention discloses an all-optical terahertz envelope detection method, and relates to the technical field of optical terahertz technology and envelope detection, and the method comprises the steps: converting a received terahertz pilot frequency and a target electric signal into a single-side-band optical signal through an ultra-wideband electro-optical processing technology; the upper path adopts a laser injection locking technology to filter a target optical signal and amplify pilot frequency optical power, and the lower path retains the target optical signal through an optical filtering technology; the optical signals of the upper path and the lower path are coupled, the optical signals are converted into intermediate-frequency electric signals through the broadband electro-optical beat frequency technology, and then digital sampling is carried out to recover target communication or sensing information. The invention further discloses an all-optical terahertz envelope detection receiving system. According to the method, the terahertz signal envelope receiving bandwidth can be effectively improved, the problem that the bandwidth of an electronic envelope detector is limited is solved, and the detection sensitivity is improved; in addition, by using the homologous characteristic of the pilot frequency and the target signal, the frequency offset interference of the target signal can be eliminated, and the system complexity is reduced.

The present invention provides a single-sideband phase-sensitive detection method, system, device, storage medium, and computer program product, which relate to the technical fields of signal processing and signal amplification and can be applied to signal detection and other situations. Specifically, a target signal in a detection system is repeatedly triggered, the modulation phase of a modulated signal is changed at each trigger time, and the target signal triggered each time is modulated based on the modulated signal to obtain multiple sets of detection signals with different modulation phases. The multiple sets of detection signals are post-processed to obtain multiple sets of equivalent single-sideband modulated signals, and the multiple sets of equivalent single-sideband modulated signals are demodulated to obtain processed signals. This improves the signal detection bandwidth and sensitivity.

The application discloses a rocket engine turbine pump rotating speed extraction method based on parameter spectrum analysis, and solves the technical problems of high calculation complexity, long operation time and poor real-time performance of a calculation method for obtaining the phase information of the first-order signal of the vibration signal by carrying out Hilbert demodulation on the first-order signal of the vibration signal, deriving the phase information of the first-order signal of the vibration signal with respect to time, and finally calculating the instantaneous rotating speed of the turbine pump according to the derivation result, and comprises the following steps: collecting a fuel pump acceleration response signal, selecting a sliding window for the collected data to obtain a to-be-processed signal, carrying out band-pass filter processing on the to-be-processed signal, carrying out power spectrum calculation on the processed data in an autoregressive process to obtain a single-sideband power spectrum, and calculating the rotating speed of the turbine pump based on the peak frequency of the single-sideband power spectrum.

The application discloses a single sideband modulation gas detection method and system based on TDLAS and an electro-optic modulator, and belongs to the technical field of gas concentration detection. The method comprises the following steps: inputting a laser beam of a specific wavelength emitted by a laser into an electro-optic modulator, and driving the electro-optic modulator by a radio frequency signal; inputting the laser beam is modulated into output light containing a carrier frequency and two sideband frequencies by the electro-optic modulator; the output light is subjected to single sideband modulation by an optical filter to obtain single sideband laser corresponding to an absorption line of a gas to be detected; the single sideband laser is guided into a gas region to be detected and reflected to a detector; the reflected light signal is converted by an electronic circuit, and the output electric signal is subjected to data processing to obtain the gas concentration of the gas to be detected. The application can realize fast modulation and response, and has the advantages of high precision and high reliability.

Embodiments of this application provide a wireless communication method, a communication apparatus, and a communication system. In the method, a terminal determines, based on a detected SSB, a first index of the SSB in a first set and a second index of the SSB, and then determines a resource of the SSB. One SSB may correspond to one or more resources, and time division multiplexing may be performed between different resources. Therefore, there is a plurality of sending occasions for one SSB. Each SSB corresponds to one transmit beam direction, so that a sending occasion of an SSB corresponding to a transmit beam direction may be flexibly adjusted. When a plurality of SSBs in one set are sent, a sending sequence of SSBs corresponding to different transmit beam directions may be determined according to a service requirement, to further determine a resource occupied by each SSB.

The application relates to the field of optoelectronic technology, and relates to an on-chip acousto-optic modulation device and a preparation method thereof. The on-chip acousto-optic modulation device comprises a lithium niobate-chalcogenide material hetero-layer arranged on a substrate, an interdigital transducer arranged on the lithium niobate film layer, and a chalcogenide photonic waveguide structure formed by etching the chalcogenide material film layer, the chalcogenide photonic waveguide structure comprising a collinear acousto-optic coupling mode conversion structure and a cascaded asymmetric waveguide mode demultiplexing structure; the collinear acousto-optic coupling mode conversion structure can simultaneously bind input light waves and surface acoustic waves, and make the light waves and the surface acoustic waves transmit collinearly in the same direction, under the phase matching condition, make incident light produce mode conversion, complete conversion from a low-order mode to a high-order mode, and produce a single sideband; the cascaded asymmetric waveguide mode demultiplexing structure is used for filtering a carrier multiple times to realize high extinction ratio. The application greatly improves the modulation efficiency of the device and greatly improves the extinction ratio.

A single-sideband phase-sensitive detection method is provided. A time-dependent target signal of a to-be-detected system is repeatedly triggered. A plurality of modulation signal sets varying in modulation phase corresponding to a plurality of triggering moments are generated. The time-dependent target signal is modulated based on the plurality of modulation signal sets corresponding to each of the triggering moments to obtain a plurality of detection signal sets varying in time and modulation phase. The plurality of detection signal sets are processed to obtain a plurality of equivalent single-sideband modulation signal sets. The plurality of equivalent single-sideband modulation signal sets are demodulated to obtain a plurality of processed signals. A single-sideband phase-sensitive detection system, device, storage medium and computer program product are also provided.