121 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.

Systems, apparatus, processes, and computer-readable media for wireless communication are disclosed. For example, an example of a process includes receiving a reflected signal from a target. In some cases, the reflected signal may include tracking reference signal (TRS) resources and radar reference signal (RS) resources. In some cases, the reflected signal may include a sidelink (SL) single sideband (SSB) resource and an SL radar RS resource. The process also includes determining a Doppler estimate for the target based on the reflected signal.

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 five-dimensional coherent detection method and a receiver. Based on a dual-polarization 90-degree optical mixer, four pairs of balanced photoelectric detectors, a single-ended photoelectric detector and a digital domain optical field reconstruction module, complex optical field reconstruction of single-sideband or double-sideband modulation local oscillation light is realized, and beat frequency damage between local oscillation and signals is eliminated; and simultaneous coherent detection of polarization multiplexing signal light and single-sideband or double-sideband modulation local oscillation light is supported. Only one path of single-end photoelectric detector needs to be additionally arranged, extra modulation information is transmitted through local oscillation light, and the dimension of a received signal is linearly expanded to five dimensions with the lowest hardware complexity. According to the invention, the linear extension of the receiving dimension is realized with the lowest hardware complexity.

The invention discloses a single side band time modulator with ultra-wideband instantaneous bandwidth. The single side band time modulator is provided with an orthogonal generation unit, an I-path modulation unit, a Q-path modulation unit, an output buffer unit and a time sequence control unit. Radio frequency input differential signals RFin + and RFin-are connected with the orthogonal generation unit, the output of the orthogonal generation unit is connected with the I-path modulation unit and the Q-path modulation unit, then input signals are modulated in the I-path modulation unit and the Q-path modulation unit respectively, the output end of the output buffer unit is the output end of the single-side-band time modulator, a modulation signal RFout is output at a single end, and the output end of the output buffer unit is connected with the output end of the single-side-band time modulator. The digital time sequence unit controls the I-path modulation unit and the Q-path modulation unit to realize vector modulation, so that a single sideband time modulation function is realized, extremely high modulation frequency input is realized, and the ultra-wideband instantaneous bandwidth is realized.

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.

The present invention discloses an analog orthogonal signal phase correction device, belonging to the technical field of semiconductor integrated circuits. The analog orthogonal signal phase correction device comprises a first single-sideband mixer (100), a second single-sideband mixer (200) and a regenerative frequency divider (300); the regenerative frequency divider (300) is used to generate an orthogonal two-frequency output; the first single-sideband mixer (100) and the second single-sideband mixer (200) are used to cooperate with the regenerative frequency divider (300) to calibrate the phase error. The analog orthogonal signal phase correction device has a simple structure and a wide correction range.

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.

The invention discloses an encryption communication method and system based on probability shaping and double single side band modulation, and the method comprises the steps: receiving an original bit stream and an initial secret key, and generating a chaotic sequence according to the initial secret key through employing a hyperchaotic model; calculating according to the chaos sequence to obtain a mask factor; performing constellation mapping processing on the original bit stream to obtain a constellation diagram; performing rotation encryption on the constellation diagram according to the mask factor to obtain an encrypted signal; performing QPSK modulation on the encrypted signal to obtain a left sideband carrier signal; performing constellation mapping after performing repeated superposition on the initial key to obtain a key signal; probabilistic shaping and QPSK modulation are carried out on the key signal to obtain a right sideband carrier signal; superposing the left sideband carrier signal and the right sideband carrier signal to obtain a mixed signal, and sending the mixed signal to a receiver through a transmitter; and the security and reliability of key transmission are improved while the signal transmission efficiency is ensured.

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 discloses a method for improving the measurement precision of a multi-frequency continuous wave radar. The method comprises the following steps of: ensuring that all signals of a responder fall within the receiving bandwidth and the dynamic range of the multi-frequency continuous wave radar; the multi-frequency continuous wave radar radiates an electromagnetic wave signal to a measurement target; the electromagnetic wave signal is received by the responder and is reflected by the measured target; the responder performs amplitude and single side band frequency modulation on the received signal and radiates the modulated signal to the outside; the multi-frequency continuous wave radar receiving system simultaneously receives a measured target reflection signal and a responder signal, and sends a baseband signal to the signal and data processing system; and the signal and data processing system discriminates the received signal, extracts a baseband signal of the responder, and completes radar tracking and measurement. According to the method, the influence of multiple scattering points of a measured target on the radar measurement precision is overcome by using the responder, the power and the measurement precision of the multi-frequency continuous wave radar are improved, and the problem that the multi-frequency continuous wave radar cannot track a low-speed target is also avoided.

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.

The invention relates to a broadband power division and 90-degree coupling integrated device for a single sideband receiver, and the device comprises a radio frequency incident port, a local oscillator incident port, a first emergent port, a second emergent port, a third emergent port, a fourth emergent port, a connection load port, a 90-degree coupler, and a power divider. The radio frequency incident port and the connection load port, the first emergent port and the second emergent port, and the third emergent port and the fourth emergent port are connected through 90-degree couplers, the local oscillator incident port is connected with the power divider, and connection channels between the three 90-degree couplers and the power divider form an integrated cross structure. Compared with the prior art, the power divider and the 90-degree coupler are integrated and connected to form an integrated cross-shaped structure, so that the input wave loss is reduced, and the transmission bandwidth is not limited any more.

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.

The invention relates to the technical field of single-fiber signal two-way transmission, and discloses a signal transmission method and system, and the method is applied to a transmitter, and comprises the steps: generating a double-sideband optical modulation signal based on an optical signal and an electric signal; filtering and combining the double-sideband light modulation signal to generate a wavelength division multiplexing single-sideband signal; and sending the wavelength division multiplexing single side band signal to a receiver through an uplink transmission direction or a downlink transmission direction, so that the receiver performs filtering and wave splitting on the wavelength division multiplexing single side band signal to generate a restored electric signal. According to the invention, the number of high-performance filters and signal transmission loss can be effectively reduced.

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.