103 results about "Single side band" patented technology

This disclosure describes an auto-calibration of mixers in a quantum orchestration platform. Predistortion is computed according to an RF signal that is downconverted with a local oscillator tone that is offset from an upconverter tone. Three tones present in the original RF signal are distinguished and used to construct a cost function. The minimization of the cost function is used to cancel an unwanted LO leakage and an image tone. Because the quantum orchestration platform generates both the unconverted IQ signals and the cost function for their optimization, the optimization can be performed in real time inside a single device without the need to communicate with external devices. This allows for the optimization of single sideband upconverted signals in a fraction of the time it typically takes using distributed systems employing separate waveform generators and spectrum analyzers.

The invention discloses an independent double-single-side-band direct detection system based on geometric shaping and digital chaotic encryption, and belongs to the field of terahertz communication. According to the detection system, an external cavity laser ECL of a sending end generates continuous optical carriers, the continuous optical carriers are input into an I / Q modulator, a TX-DSP module generates two independent vector radio frequency signals of GS-QPSK and GS-NQAM through geometric shaping and a three-dimensional multi-vortex chaos system technology, the I / Q modulator is driven to modulate the input optical carriers, and the optical carriers are transmitted to a receiver. After being amplified, the terahertz signals are input into a one-way carrier photoelectric detector for frequency beating to obtain independent double-sideband terahertz signals, the independent double-sideband terahertz signals are input into a frequency mixer of a receiving end for frequency mixing with generated local oscillation signals, down-conversion of the signals is achieved, and fundamental frequency signals are obtained; and then the data are input to an RX-DSP module, normalization, down-sampling, signal separation, de-mapping, symbol-level and bit-level decryption and other operations are carried out, and finally two paths of original data are obtained to solve the bit error rate. According to the invention, the system communication capacity is improved, and the security of independent double-sideband signal transmission is improved.

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.

The present invention relates to a signal transmission technique in an asymmetric scenario. According to the present disclosure, a method of a terminal may be provided, the method comprising the steps of: performing downlink synchronization for a first TRP on the basis of a first SSB received from the first TRP; performing downlink synchronization for a second TRP on the basis of a second SSB received from the second TRP; receiving a system information block (SIB) from the first TRP on the basis of the first SSB; and performing a random access procedure with the first TRP and the second TRP.

The invention relates to the technical field of optical fiber sensing, and provides a coefficient compensation device and method for correcting Brillouin gain spectrum distortion of a BOTDA (Brillouin Optical Time Domain Analysis). The compensation device comprises a laser and a coupler, the probe light branch optical path emits probe light into the sensing optical fiber, the pump branch optical path emits pump light into the sensing optical fiber, a stimulated Brillouin scattering effect is generated in the sensing optical fiber, and a probe light signal carrying Brillouin scattering information is obtained; the optical fiber Bragg grating filters an incoming detection light signal to obtain a first single side band signal; the detector converts the first single side band signal into a Brillouin scattering signal and inputs the Brillouin scattering signal into the processing module; the industrial personal computer is used for acquiring power fluctuation characteristics of the probe light under different frequencies when the coefficient compensation device does not generate the stimulated Brillouin scattering effect so as to calculate a compensation coefficient; and when the stimulated Brillouin scattering effect occurs, compensating the Brillouin scattering signal output by the detector by using the compensation coefficient to obtain the compensated Brillouin scattering signal.

The invention discloses a frequency stabilization and line width narrowing method for a semiconductor laser, and relates to the application of the semiconductor laser in a PDH frequency locking technology, and the method comprises the steps: S1, carrying out the first beam splitting of transmission and reflection of a light beam of a DFB laser, reflecting the reflected light beam back into the laser, and suppressing random phase noise generated by spontaneous radiation; s2, the transmission beam subjected to phase noise suppression is subjected to second-time beam splitting of transmission and reflection, the transmission beam subjected to second-time beam splitting is isolated and then passes through an electro-optic phase modulator, a carrier generated by the electro-optic phase modulator is coupled to an ultra-stable cavity, an interference signal generated by the carrier and a sideband reflection signal serves as a frequency discrimination signal, and the frequency discrimination signal is transmitted to the ultra-stable cavity; locking the carrier frequency to the longitudinal mode frequency of the ultra-stable cavity; and S3, the reflected light beam in the second beam splitting is coupled to an IQ modulator, carrier suppression single-side-band laser is generated, and the frequency-tunable narrow-linewidth frequency ultra-stable light source is obtained by changing the frequency of the radio frequency signal.

The invention discloses a self-adaptive directional sound control method and system based on a multi-loudspeaker array. The method comprises the following steps: constructing an acoustic array by utilizing a plurality of loudspeakers distributed in different directions in the mobile terminal, performing single side band up-conversion processing on an audio signal, performing digital beam forming according to a target direction, and generating a plurality of paths of driving signals with phase difference and time delay difference, thereby forming a high-directivity sound field in a space. The system collects sound field feedback signals through a built-in microphone, and adopts a minimum mean square algorithm to adjust beam parameters in real time so as to compensate for terminal attitude, shielding and environmental noise changes and realize stable directional output of a sound field. The system further comprises a parameter library and sensor fusion module which supports adaptive calibration and multi-beam output of different devices. According to the invention, programmable directional sound transmission is realized without hardware modification, and the method has high privacy, low power consumption and strong robustness, and is suitable for private communication of an intelligent terminal and a multi-user audio partition playing scene.

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.

The present invention discloses a multi - carrier modulation scheme for reconstructing orthogonal chirp multiplexing signals based on the KK relationship. By constructing a single - sideband OCDM modulation signal and using digital up - conversion technology, the real part and the imaginary part of the frequency - converted OCDM signal satisfy the Kramers - Kroning relationship. At the receiving end, a KK receiver is adopted to reconstruct the real - part and imaginary - part information of the OCDM signal, ultimately improving the receiving sensitivity of the communication system.

The present invention relates to a user equipment (UE) served by a source cell of a first network node supporting a radio access network (RAN) distributed unit (DU) function and / or Layer 2 protocol processing. The UE includes a processor and memory, and executes instructions to select from a plurality of candidate target cells controlled by the first network node based on L3 measurements and generate L1 measurements. For L1 / L2 triggered mobility (LTM), the UE determines whether the candidate cells meet preset conditions for handover and preferably periodically transmits L1 measurement reports to the first node. The preset conditions include whether single-sideband (SSB) is detected and whether a first timer associated with the L3 measurement report has not expired since a first timestamp. The UE determines whether the timer has expired since a second timestamp, and the L3 measurement report is the most recent at the time of generating the L1 measurement report.

An electronic device may include wireless circuitry with light sources that emit optical local oscillator (LO) signals onto optical paths coupled to a photomixer of an antenna. An electro-optical modulator (EOM) on an optical path may modulate one of the LO signals using an intermediate frequency signal and single sideband carrier suppression. The antenna may transmit and receive radio-frequency signals at the same frequency without adjustment to the LO signals. The frequency of the radio-frequency signals is equal to an offset between LO signals plus the frequency of the intermediate frequency signal. This may allow the device to switch between transmission and reception and / or frequencies of the radio-frequency signal without adjusting the optical LO signals, which prevents needing to re-lock the phases of the light sources and optimizes wireless performance.

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.

Frequency shift of a clock signal The present description relates to an electronic device (200) configured to apply a frequency shift function to a first signal (Clk_F) having a first frequency (F) comprising: - a delay element (206) adapted to provide a second signal (Clk_F_D) corresponding to the first signal delayed by a duration equal to a first period of said first signal (Clk_F) divided by four; - a branch successively comprising a first circuit (201) adapted to divide the frequency of a signal by a number, a second integrator circuit (203), said branch being adapted to provide a third signal (Q_comp) and a fourth signal (I_comp); and a third single-sideband mixer circuit (208). Figure for abstract: Fig. 2

The invention relates to the field of optical access networks, and provides a phase bias optimization method and device for a passive optical network modulator, and the method comprises the steps: obtaining a single side band signal; driving a passive optical network modulator by using the single sideband signal, and modulating an optical carrier of the passive optical network modulator to obtain a modulated optical signal; acquiring a spectrum of the modulated optical signal; and adjusting the phase bias value of the passive optical network modulator according to the power difference between the primary sideband and the secondary sideband in the spectrum until the spectrum of the modulated optical signal obtained after adjustment is determined to present the single sideband characteristic. According to the invention, the phase bias of the passive optical network modulator is adjusted in real time by monitoring the power difference of the main and secondary sidebands in the spectrum of the modulated optical signal, so that the optimization efficiency and accuracy of the phase bias are improved.

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.

The invention belongs to the technical field of optics, and particularly relates to an unequal-interval frequency comb generation and detection device and method based on a single side band modulator. In order to improve phase coherence between comb teeth, an arbitrary waveform generator generates a modulation signal, the modulation signal is amplified by a power amplifier and then input into a single-side-band phase modulator, a laser is connected with an optical signal input end of the single-side-band phase modulator, and an output end of the single-side-band phase modulator is connected with an optical beam splitter. The light beam splitter divides light into two paths, one path serves as reference light to enter the first detector, the first detector converts the reference light into an electric signal and then carries out FFT observation, the other path serves as detection light, is absorbed by the gas chamber and then is input into the second detector, and the second detector converts the detection light into an electric signal and then carries out FFT observation.

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.

The present invention discloses an independent dual-single-sideband direct detection system based on geometric shaping and digital chaos encryption, which belongs to the field of terahertz communication. In the detection system, the external cavity laser ECL at the transmitting end generates a continuous optical carrier, which is input to the I / Q modulator. The TX-DSP module uses geometric shaping and three-dimensional multi-vortex chaotic system technology to generate two independent vector radio frequency signals of GS-QPSK and GS-NQAM, drives the I / Q modulator to modulate the input optical carrier, and after amplification, inputs it to a single-row carrier photodetector for beat frequency to obtain an independent double-sideband terahertz signal, which is input to the mixer at the receiving end for mixing with the generated local oscillator signal to achieve signal down-conversion and obtain a baseband signal; then it is input to the RX-DSP module for normalization, down-sampling, signal separation, demapping, symbol-level and bit-level decryption, and finally obtains two channels of original data to calculate the bit error rate. The present invention improves the communication capacity of the system and improves the security of independent double-sideband signal transmission.

Circuit and method for electro-optic modulation of an RF signal to produce a single-sideband reduced-carrier phase-shifted (SSB-RC-PS) modulated signal includes: receiving an optical carrier signal; receiving the RF signal; modulating the RF signal with a first portion of the optical carrier to produce a single sideband (SSB) modulated signal; amplitude and phase modulating a second portion of the optical carrier signal and combining with the modulated signal to produce a first combined signal, the amplitude modulation and phase modulation of the second portion of the optical carrier signal are dynamically controlled to directly match the amplitude and inversely match the phase of the modulated signal; and amplitude modulating and phase modulating a third portion of the optical carrier signal and combining third portion with the first combined signal to produce the second combined signal, the product of which is a single sideband reduced carrier phase shifted (SSB-RC-PS) modulated signal.

The invention relates to a digitally-controlled quadrature modulation laser single side band frequency shift and phase locking device and method, a field programmable logic gate array of the device is connected with four digital-to-analog converters, every two digital-to-analog converters are connected with a quadrature modulator, the two quadrature modulators are also connected to an optical quadrature modulator, and the optical quadrature modulator is connected with the four digital-to-analog converters. The output of the laser source realizes single side band frequency shift through an optical quadrature modulator, part of optical signals are converted into electric signals through a third beam splitter, and parameters of the optical modulator are adjusted in real time through a voltage control port. And the other path of laser is interfered with the frequency-shifted optical signal in the beam combiner through the first beam splitter, demodulated by the orthogonal down-conversion mixer, fed back with phase information, and transmitted back to the field programmable logic gate array through the three-channel analog-to-digital converter to form closed-loop control. According to the invention, the influence of sideband signals generated by adjustment is reduced; moreover, the frequency shift bandwidth can be higher, the influence of a spatial light path is reduced, and the stability is improved.

An acousto-optic modulator that includes a waveguide on an acoustic actuator is disclosed. The waveguide carries an optical signal having a UV or visible wavelength. When the acoustic actuator is activated, the optical signal in the waveguide is bathed in intense acoustic waves. By using a waveguide having the appropriate dimensions to strongly confine both the optical signal and the acoustic waves, strong optomechanical coupling may be achieved between the optical and acoustic modes, resulting in an efficient modulator. By employing either intra-modal or inter-modal conversion, the modulator may be used to implement a variety of dual- or single-sideband functions, including an isolator, a phase modulator, a single-sideband frequency shifter, or a high-extinction shutter.

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 relates to a joint equalization method based on a generalized noise whitening filter, which comprises the following steps of: after an MIMO (Multiple Input Multiple Output) linear equalizer is used for processing sideband residual crosstalk and inter-symbol crosstalk at a receiving end, whitening and equalizing amplified low-frequency and high-frequency noise through a cascaded three-tap generalized noise whitening filter; and a maximum likelihood sequence estimation (MLSE) algorithm is used to eliminate the known inter-symbol crosstalk introduced by the whitening filter so as to realize joint equalization. According to the invention, the influence of sideband residual crosstalk and intersymbol crosstalk on the double-single sideband signal can be suppressed at the same time, the problem of amplifying low-frequency and high-frequency noise at the same time in linear equalization can be solved, the transmission performance of the system is improved, meanwhile, a protection frequency band can be removed, and the spectrum utilization rate of the system is improved.