75 results about "Noise bandwidth" patented technology

The invention discloses a loop self-regulation method of a satellite navigation receiver. Judgment and steps for optimizing loop parameters are increased on the basis of keeping original tracking loop structures of the receiver, and loop orders and noise bandwidth can be automatically adjusted according to carrier dynamic information. The method does not need to add a complete inertial navigationsystem additionally.

The invention relates to a PUSCH (physical uplink shared channel) transmission method and a mobile terminal in a dynamic TDD (time division duplex) system for supporting carrier aggregation. The invention discloses the PUSCH transmission method, which comprises the following steps: in the system for supporting the carrier aggregation, if one or a plurality of serving cells work in a dynamic TDD mode, when in cross-carrier scheduling, eNB (effective noise bandwidth) can determine a synchronous HARQ (hybrid automatic retransmission request) timing relationship of a PUSCH to be scheduled through the working modes of a scheduling serving cell and a scheduled serving cell as well as the TDD uplink-downlink configuration of the scheduling serving cell and the scheduled serving cell. UE (user equipment) can determine a synchronous HARQ timing relationship of the PUSCH through the working modes of the scheduling serving cell and the scheduled serving cell as well as the TDD uplink-downlink configuration of the scheduling serving cell and the scheduled serving cell, detects an uplink scheduling instruction and finally sends the PUSCH according to the scheduling instruction.

The invention provides a loop tracking method and system. The method includes the following steps that: received satellite signals are converted to digital intermediate-frequency signals; the coherent integral values of an instant branch, a lead branch and a lag branch are calculated according to the digital intermediate-frequency signals; the coherent integral values of the instant branch is inputted into a carrier loop phase discriminator, the coherent integral values of the lead branch and the lag branch are inputted into a code loop phase discriminator; a linear state equation is established, and results outputted by the carrier loop phase discriminator and the code loop phase discriminator are adopted as observation vectors, and Kalman filtering is performed on the observation vectors. According to the loop tracking method and system of the invention, the Kalman filtering and the traditional tracking loops are coupled; the output of the code loop phase discriminator and the carrier loop phase discriminator is adopted as an integrated body so as to be subjected to adaptive processing; dynamic adjustment of loop noise bandwidth can be realized, and the loop noise bandwidth can be adjusted in real time adaptively with the change of an environment; the advantages of the Kalman filtering in dynamic data processing can be given to full play; higher-accuracy of positioning and navigation can be achieved in a high-dynamic environment.

The invention discloses a noise coefficient measurement method based on two detection modes, and belongs to the technical field of tests. The method comprises the steps of computing a noise power generated by a vector network analyzer according to powers acquired by two detection modes which respectively adopt an average value and an effective value, and working out a noise coefficient of the vector network analyzer according to a relation between the noise powers and the noise coefficients; then connecting a measured piece, measuring an overall noise power generated by the measured piece and the vector network analyzer and a gain of the measured piece, and working out a noise coefficient of the measured piece and the vector network analyzer cascaded together; and at last, working out a noise coefficient of the measured piece according to a noise coefficient cascading formula. According to the method, measurement of the noise coefficient can be achieved without precisely calibrating a noise source, high precision and rapid scanning measurement of the noise coefficient can be achieved without configuring a noise coefficient analyzer, and thus the test cost is reduced; furthermore, the noise bandwidth can be counteracted during a computation process, so that the adverse effects of the bandwidth accuracy on measurement precision are overcome.

The invention proposes a method for tracking a weak maneuvering target angle through an airborne digital array radar. The method comprises the steps: taking a pitch angle error and an azimuth angle error as observation values, so as to respectively carry out the real-time measurement of curved line knee points; enabling a digital loop filter to employ a smaller loop equivalent noise bandwidth to tracking a target when there is a knee point. The method increases the angle error convergence rate of an angle tracking loop, reduces the filtering disturbance at the knee point, and maintains the continuity of tracking.

A method for testing radio frequency interference (RFI) of electromagnetic compatibility (EMC) chamber includes: setting a threshold value of noise bandwidth (NBW) on the computer in response to user's operation, activating a signal source in the EMC chamber to transmit test signals using the computer, adjusting the antenna to a predetermined height and orients a polarization direction along a vertical direction, and controlling the signal source to rotate using the computer, testing the EMC chamber to obtain a NBW value, and comparing the NBW value with the threshold value to determine the RFI of the EMC chamber.

The invention discloses a receiver carrier wave tracking implementation method based on multi-information fusion assistance. According to the method, the radial speed of a satellite relative to a user is calculated according to information such as a satellite orbit and the position and speed of the user, and the Doppler frequency shift of a received carrier wave is predicated, wherein the information is obtained after a receiver is positioned; the actually measured value of the Doppler frequency shift of the carrier wave is output by a tracking loop in the receiver; correction is carried out on measurement remnants of the Doppler frequency shift through the Kalman filtering method, and the corrected optimal estimated value of the Doppler frequency shift is fed back to the tracking loop. According to the loop design method, dynamic influences caused due to the fact that the satellite moves relative to the user, a loop filter can be designed to work under a narrow noise bandwidth, the loop filtering effect is enhanced, and a system integrates robustness and high sensitivity. According to the Kalman filtering method adopted in the method and system, gain can be adjusted dynamically, optimal estimation of feedback of the Doppler frequency shift is achieved, and therefore the method and system have high commercial value.

The invention provides a CMOS (Complementary Metal Oxide Semiconductor) image sensor which comprises a pixel unit, wherein the pixel unit comprises a reset transistor, a selecting transistor and an amplifying transistor; the reset transistor comprises a source electrode, and the source electrode is used as an inducing node of the pixel unit. The CMOS image sensor also comprises a reset unit, wherein the reset unit improves the potential of the inducing node to a high potential when an input first signal is the high potential and increases the channel resistance of the reset transistor when the first signal is converted into a low potential from the high potential. By increasing the conducting resistance of the reset transistor, the reset noise bandwidth is relatively reduced so that more reset noise can be removed by a negative feedback operation amplifier.

The invention discloses a method for a base station to report UE (user experience) capability, a base station and a system. The system comprises the base station, a UE and a core network; the base station comprises a UE capability obtaining module and a UE capability reporting module, wherein the UE capability obtaining module is used for sending initial UE message to the core network during the UE access process after receiving RRC (radio resource control) connection building completion message, and simultaneously obtaining UE capability from the UE; and the UE capability reporting module is used for reporting UE capability to the core network after receiving initial context building request message of the core network. The method, the base station and the system do not wait initial context building request message after eNB (effective noise bandwidth) sends initial UE message, directly initiate a UE capability obtaining process, can more rapidly reply UE capability message to the core network after receiving initial context building request message, and continuously access a flow, so as to ensure that the UE capability obtaining process is advanced, and the UE capability obtaining process and the initial UE message processing process are processed simultaneously, and save access time delay.

The invention provides a GPS weak signal tracking method in a high dynamic environment. Problems that lock losing is likely to happen due to a narrow single phase locked loop noise bandwidth and too much noise is likely to be introduced due to a wide single frequency locked loop noise bandwidth when the GPS is in the high dynamic environment are solved in a new mode of using a two-order frequency locked loop (FLL) to assist a three-order phase locked loop (PLL) formed by the phase locked loop and the frequency locked loop. A UKF filter mode is combined to track weak signals. A nonlinear Kalman filler mode is adopted to enable a receiver to process signals with a low carrier to noise ratio. Signals tracked by the front phase locked loop and the frequency locked loop pass through the UKF filter, the UKF filter estimates a position, a speed, clock skew and a clock frequency difference, and thus a code phase and a carrier frequency are corrected. In the GPS high dynamic and multipath complex environment, a new research method is provided, and a strong promotion ability is provided.

The present technology provides robust, high quality expansion of the speech within a narrow bandwidth acoustic signal which can overcome or substantially alleviate problems associated with expanding the bandwidth of the noise within the acoustic signal. The present technology carries out a multi-faceted analysis to accurately identify noise within the narrow bandwidth acoustic signal. Noise classification information regarding the noise within the narrow bandwidth acoustic signal is used to determine whether to expand the bandwidth of the narrow bandwidth acoustic signal. By expanding the bandwidth based on the noise classification information, the present technology can expand the speech bandwidth of the narrow bandwidth acoustic signal and prevent or limit the bandwidth expansion of the noise.

The invention discloses a method for supplying service for a terminal through a TDD (Time Division Duplex) cell. The method comprises the following steps of: setting a cell generating interference between a frequency band and an FDD (Frequency Division Duplex) frequency band to be an upstream cell just for transmitting upstream data or a downstream cell just for transmitting downstream data on a TDD eNB (Effective Noise Bandwidth) in advance, and saving configuration information of the upstream cell and configuration information of the downstream cell in the eNB; sending the configuration information of the upstream cell and the configuration information of the downstream cell to UE (User Equipment) by the eNB; receiving the configuration information of the upstream cell and the configuration information of the downstream cell by the UE, and carrying out data transmission between the UE and the eNB through the upstream cell and/or the downstream cell. The invention also discloses a system for supplying service for the terminal through the TDD cell. According to the system disclosed by the invention, the interference between frequency bands of an FDD system and a TDD system is solved, the coexistence of the FDD system and the TDD system is realized, the frequency spectrum resource can be fully utilized, the high utilization ratio of the frequency spectrum resource is ensured, and the resource is saved.

The invention discloses a method for effective noise bandwidth (eNB) global identification configuration. Under a network sharing mode, the global eNB identification (ID) of eNB is configured in a web master configuration system. The public land mobile network (PLMN) ID of the global eNB ID is set according to the identification of a service provider, and the eNB belongs to the service provider. When an eNB system is successfully started, the global eNB ID of the eNB is sent to a foreground data base in a synchronous mode through the web master configuration system. The eNB system reads the global eNB ID of the eNB and stores the global eNB ID of the eNB. During a signal interactive process, the PLMN ID in the global eNB ID of the eNB of signal information is filled as the PLMN ID of the stored global eNB ID. The invention further discloses a system for eNB global identification configuration and an eNB system. The eNB can be accurately and uniquely identified under the network sharing mode, and a filling problem of the PLMN ID in the global eNB ID is solved.

The invention discloses an uplink data transmission method and a device. The method includes that user equipment (UE) determines that uplink data to be sent is the last pack of data in the UE cache; a logo is added in the uplink data to be sent, wherein the logo is used for indicating that the uplink data to be sent are the last pack of data in the UE cache; the uplink data to be sent is sent to effective noise bandwidth (eNB). The method can avoid the authorization of the eNB for the UE feedback new data packets after the last pack of the data is transmitted in the UE cache, and the waste of resources is further avoided.

The invention discloses a communication method of periodic service, effective noise bandwidth (eNB) and user experience (UE), and relates to the technical field of communication. The method is low in complexity of resource scheduling and energy-saving. The communication method of the periodic service includes that periodic uplink resource scheduling parameters are sent to the UE, and the UE conveniently confirms uplink sources and transmission forms of transmission of uplink date according to the periodic uplink resource scheduling parameters. The periodic uplink resource scheduling parameters comprise positions of the uplink sources on the time domain and the frequency domain, transmission forms of the uplink data, and uplink data sent by the UE.

The invention relates to the field of communications, and particularly discloses an optical signal-to-noise ratio measurement method. The method comprises the steps of conducting light dispersion compensation on the signal light, then transmitting the signal light to a delay self-coherence interferometer, obtaining interference light intensity changes based on the delay self-coherence interferometer, wherein the delay difference between two arms of the delay self-coherence interferometer is larger than the code element period of signal light transmission signals; obtaining an interference light intensity change range, dividing the range into a plurality of continuous intervals, and obtaining a frequency histogram of interference light intensity distribution; inputting the frequency histogram into a pre-trained machine learning model to obtain an optical signal-to-noise ratio of signal light; meanwhile, the machine learning model is obtained by training a plurality of groups of frequency histograms with known optical signal-to-noise ratios and corresponding optical signal-to-noise ratios as a training set, optical signal-to-noise ratio monitoring can be realized at a receiving end and a link node, the measurement precision is higher, and the influence of signal and noise bandwidth changes is not easy to occur.

The invention discloses a method and device for configuring a noise threshold and a noise bandwidth. The method comprises the steps that a recording signal is obtained by recording noise of a work environment of a monitoring device; according to the recording signal, the activity period intensity and the time-frequency characteristic distribution interval are determined; according to the activityperiod intensity and the time-frequency characteristic distribution interval, the noise threshold intensity change characteristics and the time-frequency distribution change characteristics are built;according to the noise threshold intensity change characteristics and the time-frequency distribution change characteristics, configuration parameters of the monitoring device are determined; according to the configuration parameters, the noise threshold and the noise bandwidth of the monitoring device are configured. By means of the method, the technical problems are solved that when the noise threshold and the noise bandwidth are manually set or detected through noise filtering, the requirements for the detection effectiveness in different noise environments and under different running conditions are difficult to met.

An interfered channel self-detection GPS vector tracking loop scheme includes five steps: 1. according to arrangement and a fusion relation of information flow in GPS vector tracking loop, a precise GPS vector tracking loop (including a VFLL and a VDLL) system models are derived and established; 2. according to the system models of the VFLL and VDLL, transfer functions and noise bandwidth models of the VFLL and VDLL are established; 3. an interfered channel self-detection GPS vector tracking loop scheme working process is designed; 4. an interfered channel self-detection GPS vector tracking loop combined filter model is designed; and 5. a channel error on-line detection algorithm is utilized to detect and eliminate interfered channels in the GPS vector tracking loop. The method provided by the invention can effectively identify and isolate the interfered signal channels, thereby improving anti-interference of GPS vector tracking and navigation calculation precision of a GPS vector receiver.

The invention belongs to the field of satellite receiver baseband signal processing, and relates to a processing method of a satellite receiver tracking loop assisted by inertial information. According to the invention, accelerated speed information output by inertial navigation is used to assist the satellite receiver tracking loop to reduce the dynamic stress error of a carrier tracking loop; the equivalent noise bandwidth of the tracking loop can be reduced; long-time coherent integration is realized; the thermal noise error of the loop can be reduced; the tracking performance of the loop for a low carrier-to-noise ratio signal is improved; the realization form of the satellite signal tracking loop under the assistance of inertia information is disclosed; the calculation of the loop assistance quantity of the inertia information, the loop filter order, the loop filter bandwidth, the loop filter realization structure and the loop filter switching application form are mainly comprised; the tracking dynamic performance of a satellite receiver is improved; and the sensitivity of the receiver is improved.