124 results about "Signal quality index" patented technology

A method of determining a radio link quality state in a wireless communication system by predicting a signal quality metric of a secondary channel in the absence of the second signal. The predicted signal quality metric may be determined from a received reference signal on a first channel and a measured interference level of the second channel.

A method for restraining inter-cell interference in a mobile communication system is provided. The method uses the fast dynamic selection of the Fractional Frequency Reuse (FFR) technology and the Macro Diversity (MD) technology of the cell edge to increase the cell edge user data rate and provide excellent system capacity. The method is particularly suitable in a OFDMA mobile communication system downlink. The method comprises the steps of: (a) determining whether the cell edge user is able to operate the MD technology; (b) processing the fast dynamic selection of the FFR technology and the MD technology for the cell edge user, and the selection is made based on a instantaneous link Signal Quality Index (SQI); and (c) allocating the center subband or the edge subband to the cell edge user according to the selection.

A method and a device for determining the quality of signal used for measuring a physiological parameter. One embodiment of the present invention is directed towards a pulse oximeter, where the measured physiological parameter includes a patient's pulse rate and blood oxygen saturation. The signal quality, which is indicative of the accuracy and reliability of the measured physiological parameter, is calculated by combining a plurality of signal quality indicators, each of which is an indicator of a quality of the measured signal. The value of the signal quality metric is compared to a threshold and based on this comparison various decisions are made by the medical device. One decision is directed towards deciding whether or not to display the measured physiological parameter, to ensure that only accurate measured values are displayed. Another decision is directed towards providing feedback to guide the clinician to adjust the location of the sensor to a more suitable tissue location.

A read servo mechanism that uses levels of read data signal quality to maintain track centerline is presented. In a seek operation mode, a baseline signal quality value is sampled at a current tracking position and, once the baseline signal quality value is established, the head is stepped to change its position and the signal quality value sampled after each position change to determine change in signal quality until the change in signal quality is found to be insignificant. After a predetermined interval, the signal quality value is again sampled. If the signal quality value has changed significantly or the time that has expired since the seek operation mode ended is greater than some larger interval, the seek operation is repeated in an effort to search for a new baseline level of signal quality (and, therefore, the new track center).

A test stimulus includes two signals RR, S. Signal S is transmitted to a customer equipment interface and over a system under test to a complementary remote apparatus. The test apparatus has two inputs processed by a number of functional elements. The first input is the reference signal RR. The other input is a corresponding test signal R' generated at remote test apparatus as a test signal R, identical with reference signal RR, and transmitted over the system under test via the customer interface. These two versions of the same test signal are compared. Firstly, the signals RR, R' are processed by a psycho-acoustic model, the output of which is transmitted to a perceptual layer, and then to a conversion unit which also receives a further input from a non-optimum loudness rating unit. The output from the conversion unit is transmitted to a signal quality determination unit, which also receives an input from the customer equipment interface. The non-optimum loudness rating unit processes inputs from the customer equipment interface and signal generator. During an iterative process, the signal generator receives feedback control from the signal quality determination unit. The remote test apparatus similarly receives a modified version of signal S (viz S') from the network and compares it with a locally-generated reference version SR. In an alternative arrangement the same test apparatus is connected to both test points of the network and processes both signals S and R, either serially or in parallel.

A method for determining coverage gaps within a geographical area served by a wireless communication network includes: (a) receiving a location report from each of a plurality of mobile units; (b) storing all location reports received from the mobile units in a database; and (c) searching the database for a position within the geographical area at which an acceptable quality wireless signal has not been received. The location report may include a measured signal quality metric of the wireless link, which may be the signal strength of the wireless link, a bit error rate of the wireless link, or both. Location reports may be displayed on a map to show coverage quality and gaps. Statistical technique and quantitative techniques can be applied on the signal quality metrics reported.

A computer-driven device assists a user in self-regulating speech control of the device. The device processes an input signal representing human speech to compute acoustic signal quality indicators indicating conditions likely to be problematic to speech recognition, and advises the user of those conditions.

The invention discloses a transreceiver and a zero intermediate frequency emission calibrating method. The transreceiver comprises a zero intermediate frequency emission circuit and a receiving circuit, and also comprises a coupling module and a calibration parameter adjusting module, wherein the coupling module is arranged between the zero intermediate frequency emission circuit and the receiving circuit, and is used for coupling radio-frequency signals of the emission circuit to the receiving circuit; and the calibration parameter adjusting module is arranged on the receiving circuit, used for adjusting unbalance factors of the coupled signals in a close loop to make the signal quality index meet the predetermined demand, and uses the adjusted unbalance factors as calibration parametersto calibrate the emission signals of the emission circuit. The method of the invention can adaptively adjust the calibration parameters of the zero intermediate frequency signals with lower cost according to environmental requirements.

The invention is intended to provide an adaptive rate adjustment method of an LPWAN internet of things based on a network condition. The adaptive rate adjustment method comprises the steps of receiving uplink frames sent by a terminal; sampling SNR and RSSI values of latest N frames; making a statistics of a packet loss rate according to continuity of frame serial numbers; making a statistics of loads erl of SF (Spread Factor) sub-channels according to occupied channels and used SFs of the terminal; weighting to calculate an expected DR (Data Rate) <mote> of the terminal; when the packet lossrate of the terminal exceeds a packet loss threshold value in an ADR (Adaptive Data Rate) strategy, performing packet loss rate adjustment; when the packet loss rate of the terminal does not exceed the packet loss threshold value in the ADR strategy, performing normal rate adjustment; sending an ADR command to the terminal, and enabling the terminal to adjust a data transmission rate according toan own strategy after receiving the ADR command and make a response; and if a LoRaWAN server does not receive the response, considering that the sending is failed, and repeating to send till the response is received. The adaptive rate adjustment method has the following beneficial effects: the adaptive adjustment can be performed on the data rate of the terminal according to an own network condition including conditions such as a signal quality index, a channel load and the packet loss rate.

A physiological parameter processing method comprises the following steps: acquiring more than two physiological signals; analyzing the more than two physiological signals separately, to obtain a signal quality index of each physiological signal; processing the more than two physiological signals separately, to obtain homologous physiological parameters obtained by using the physiological signals; and converging, according to the obtained signal quality index of each physiological signal, the homologous physiological parameters obtained by using the physiological signals, to obtain a converged physiological parameter. In the foregoing physiological parameter processing method, more than two physiological signals and signal quality indexes thereof are acquired, and homologous physiological parameters obtained by using the physiological signals are converged according to the signal quality indexes, thereby overcoming a defect caused by acquiring a parameter only based on a single physiological signal; and when the single physiological signal is interfered, physiological parameters of other physiological signals can be used to make improvements.

The present disclosure relates to a system for physiological signal quality assessment, the system includes: a first filter module for implementing a filter process on an inputted first physiological signal; a first periodicity detection module for detecting periodicity of the filtered first physiological signal, and determining periodic segmentation point of the first physiological signal; a feature extracting module for extracting corresponding signal features of the first physiological signal in each heart period; and a fuzzy logic module for building up a fuzzy logic model according to the extracted signal features, and calculating a signal quality index for the first physiological signal in the relative period based on the built fuzzy logic model, and determining a signal attribute according to the signal quality index. A method for physiological signal quality assessment is provided as well. The system and method for physiological signal quality assessment calculate the signal quality index, determine the signal attribute according to the signal quality index, therefore recognize the abnormal signal out of the first physiological signal, and result in high quality physiological signals.

An optical disc apparatus includes a control section. The control section performs a first search while the tracking control is in the off state. The first search is for searching for a plurality of sets of the focus positions of the light beam and the spherical aberration amounts such that an amplitude of the tracking error signal is greater than a predetermined value. The control section performs a second search while the tracking control is in the on state. The second search is for determining a set of the focus position of the light beam and the spherical aberration amount such that the reproduced signal quality index is substantially optimal, among the plurality of sets of the focus positions of the light beam and the spherical aberration amounts obtained in the first search.

A gain control method which includes setting a first initial gain value to a first variable gain amplifier; measuring a first power value corresponding to incoming signals; measuring a second power value corresponding to a target signal; and resetting the first initial gain value according to the first power value and the second power value. Another gain control method is also disclosed, which includes updating a gain value of a first variable gain amplifier by combining an adjustment value with the gain value according to a first tuning direction; obtaining a signal quality indicator; comparing the signal quality indicator with a reference signal quality indicator to generate a comparison result; and referring to the comparison result, further updating the gain value according to the first tuning direction or a second tuning direction opposite to the first tuning direction.

The invention discloses an oxyhemoglobin saturation detection method and an oxyhemoglobin saturation detection system. The oxyhemoglobin saturation detection system comprises a preprocessing device, a standard model establishing device, an SSF processing device, a waveform characteristic judging device, a device for extracting waveforms of pulses one by one, a signal quality index calculating device, a device for calculating a distance between adjacent peaks of pulse signals, an R value calculating device, an R value Kalman filtering device and an oxyhemoglobin saturation calculating device. In the system adopting the oxyhemoglobin saturation detection method of the technical scheme, because sampled data close to the slope and maximum points of the waveforms of the pulses is selected as sample points for calculating the oxyhemoglobin saturation during calculation, the sample points better represent the oxygen content of blood in a human body, and calculation errors caused by noise interference when peak points / valley points serving as characteristic value points are extracted are avoided, so the noise interference can be effectively reduced, the signal-to-noise ratio of the oxyhemoglobin saturation is improved and the detection accuracy of the oxyhemoglobin saturation is improved.

The invention discloses a heart-rate estimation method and device based on fusion of electrocardiogram signals and pulse signals. The heart-rate estimation method includes the steps that heart rate estimation is carried out based on the electrocardiogram signals and the pulse signals respectively; the electrocardiogram signals and the pulse signals are subjected to signal quality evaluation respectively, and the signal quality index of the electrocardiogram signals and the signal quality index of the pulse signals are obtained; based on the two signal quality indexes, the two estimated heart rate values are subjected to kalman filtering processing; the two estimated heart rate values subjected to kalman filtering processing are subjected to weight fusion. By means of the heart-rate estimation method, the accuracy of heart-rate estimation can be effectively increased, and a reference is provided for clinical caring.

A method of operating a communication system is disclosed. A location associated with a first wireless device is received. For a first frequency band, a first stored signal quality indicator associated with the location is received. For a second frequency band, a second stored signal quality indicator associated with the location is received. Based on the first stored signal quality indicator and the second stored signal quality indicator, the first frequency band is selected.

A method for controlling antennas, performed by a virtual tunneling processor of a wireless access point, is provided and contains at least the following steps. Obtaining a plurality of first signal quality indices associated with a connecting device by respectively detecting the plurality of first signal quality indices by a plurality of antenna patterns, selecting a plurality of best antenna patterns as a plurality of antenna-pattern candidates according to the first signal quality indices, obtaining a plurality of second signal quality indices associated with the connecting device by respectively detecting the plurality of second signal quality indices by the antenna-pattern candidates, and storing the second signal quality indices in a database.

In data transmission of synchronous digital hierarchy (SDH), line unit not only refers to state of main and standby in crossing unit, but also refers to signal quality in each channel for gating channel to receive service information. The said line unit detects signal quality in each relevant channel of main and standby crossing unit. When signal qualities are identical between channels of main and standby, then channel in main crossing unit is selected in preference. When signal qualities are different between channels of main and standby, channel providing better quality is selected.

In one embodiment, the present invention provide a method for detecting signal quality metrics of a constant modulo (CM) signal received in two different signal paths, and combining the signal from the two signal paths based at least in part on the detected first and second signal quality metrics. Such method may be implemented in a radio receiver such as an automobile receiver.

The invention provides a signal receiving method and device and a terminal, and relates to the technical field of communication. The signal receiving method comprises the following steps of: receivinga signal; when the first signal receiving and transmitting module is in a signal receiving state; obtaining a first numerical value of a received signal quality index of the first signal receiving and transmitting module when the second signal receiving and transmitting module is in a signal receiving state, and obtaining a second numerical value of a received signal quality index of the first signal receiving and transmitting module when the second signal receiving and transmitting module is in a signal transmitting state; And controlling the transmitting power of the second signal processing module in the signal transmitting state according to the difference value between the first value and the second value. According to the embodiment of the invention, by controlling the transmittingpower of the second signal processing module in the signal transmitting state, the transmitting power of the second signal processing module can be in the preset range, and the problems that signal interference cannot be effectively avoided or the communication of an interference source cannot be ensured by turning off the transmitting signal of the interference source are solved.

The invention discloses a method for triggering cell reselection / switching by a mobile terminal. The method comprises the following steps: UE monitors a neighbor cell and a target cell after the neighbor cell satisfying a reselection / switching triggering condition is detected; within a triggering time, the UE respectively monitors the target cell and a service cell by using a relative signal quality index measured value and an absolute signal quality index measured value as cell signal quality values; the UE exits the cell reselection or switching triggering process if the target cell does not satisfy the reselection or switching triggering condition within the triggering time; and otherwise, the UE triggers a reselection or switching triggering event while the triggering time is satisfied. In a technical scheme of the invention, the reselection / switching triggering condition is judged within the triggering time by using the relative signal quality index measured value aiming at the service cell and the reselection / switching target cell, thereby reducing the dependence of the reselection / switching event triggering on the unreliable absolute signal quality index and improving the triggering accuracy of the reselection / switching event.

The invention provides a method for monitoring the signal quality by adopting a multichannel parallel correlation peak sampling mode, and belongs to the field of satellite navigation. The method comprises the following steps of: determining the number of sampling points based on a sampling frequency and the number of channels of a receiver according to an actual monitoring task demand of a user; then detecting a satellite to be monitored by adopting the multichannel parallel correlation peak sampling mode, acquiring correlation peak sampling values, and fitting the acquired correlation peak values; and acquiring a detection statistic of every two symmetric sampling points, and monitoring the correlation peak quality of a signal in real time by adopting a weighted difference method according to the detection statistic of every two symmetric sampling points. Hardware facilities are not required to be changed, and the method is suitable for satellite bands; only aiming at detection of a satellite signal, all channels are set according to the satellite signal; due to a plurality of channels for sampling, the sampling rate is increased because of the advantage that the time is replacedwith the space; furthermore, the quality of the satellite signal is detected, and the cost is saved.

The invention relates to a signal receiving method and a signal receiving system of a mobile terminal. The method comprises the steps of receiving a signal from at least one antenna in an initiate mode of a plurality of antennas, wherein the plurality of antennas are respectively connected with a radio frequency front end through switches, and the switches respectively control the connected antennas to switch on or not switch on; measuring a signal quality index of the received signal; comparing the signal quality index with a threshold, and determining the quantity of antennas to switch on according to a comparison result; and outputting a control signal to each switch according to the quantity of the antennas determined to switch on.

An optical information processing apparatus includes: an optical head for irradiating an optical information recording medium with light, converting the light reflected by the optical information recording medium into a head signal and outputting the head signal; a signal quality index detector for detecting a signal quality index representing quality of the head signal on the basis of the head signal; and a two-dimensional probe for varying the focal position and the spherical aberration of the light radiated onto the optical information recording medium so as to search for a focal position and a spherical aberration that optimize the signal quality index detected by the signal quality index detector.

The invention discloses a power adjusting device and method. The device comprises a receiving module, an obtaining module, an adjusting module and a sending module. The receiving module is used for receiving signals of a terminal device. The obtaining module is used for obtaining a signal quality index according to the signals received by the receiving module, wherein the signal quality index is used for identifying the signal quality of signals which are sent by the power adjusting device and received by the terminal device. The adjusting module is used for adjusting the emission power according to the signal quality index after the obtaining module obtains the signal quality index. The sending module is used for sending signals according to the emission power adjusted by the adjusting module. According to the above scheme, the power adjusting device is capable of dynamically adjusting the emission power according to the signal quality index of the signals received by the terminal device, the receiving performance of the terminal device is ensured, and the reliability of communication is enhanced.

The invention discloses a beam detection method and a beam detection device, which are used for solving the problem of lack of good communication quality for detecting downlink beams in the prior art.The beam detection method comprises the following steps: the terminal equipment receives a beam quality monitoring signal sent by the network equipment by using M beams; Determining signal quality indexes of the M beam quality monitoring signals, and determining a beam quality index of a beam for sending the beam quality monitoring signal based on the signal quality index of each beam quality monitoring signal in the M beam quality monitoring signals; Generating a first detection report, The method comprises the following steps: indicating information of beams of which at least one beam quality index does not meet a first threshold in M beams, wherein the at least one beam quality index does not meet at least one of the beam quality index of the beam with the first threshold, the indication information of the beam with the at least one beam quality index meeting the second threshold and the beam quality index of the beam with the at least one beam quality index meeting the second threshold; And sending the first detection report to the network device.

A physiological parameter processing method includes acquiring a main physiological signal, and analyzing the main physiological signal to acquire the signal quality indexes of the main physiological signal; acquiring auxiliary physiological signals, and analyzing the auxiliary physiological signals to acquire the signal quality indexes of the auxiliary physiological signals; controlling the physiological parameter acquiring process by processing the main physiological signal according to the signal quality indexes of the main physiological signal and the signal quality indexes of the auxiliary physiological signals; outputting the physiological parameters. The physiological parameter processing method has the advantages that the auxiliary physiological signals are utilized to assist with main physiological signal processing, the information source is expanded as compared with that of a processing manner relying on one single physiological signal, especially when the signal quality of the single physiological signal is poor, and the false alarms and alarm failures can be avoided by the aid of the auxiliary physiological signals; in addition, the invention further provides a physiological parameter processing system and monitoring equipment adopting the physiological parameter processing method and system.

The invention discloses a respiration rate extraction method. The method includes the following steps of acquiring an original ECG signal and obtaining an ECG signal to be processed based on the original ECG signal; filtering the ECG signal to be processed to obtain a first respiration signal and calculating a first respiration rate at the current time based on the first respiration signal; performing wavelet transformation on the ECG signal to be processed to obtain a second respiration signal and obtaining a second respiratory rate at the current time based on the second respiration signal through calculation; and analyzing the first respiration signal and the second respiration signal based on a signal quality index to obtain a first weighting factor corresponding to the first respiration rate and a second weighting factor corresponding to the second respiration rate through calculation, and obtaining the respiration rate at the current time through calculation. The invention further discloses a respiration rate extraction apparatus. According to the invention, the respiration signals can be easily and efficiently extracted, and the accurate and stable respiration rate can be obtained through calculation.

A method of evaluating the quality of a read signal from the viewpoint of the detection margin of a Viterbi decoder in the PRML method in which a target signal level varies depending on the read signal, and an optical disc apparatus implementing the method. A method of evaluating the quality of a signal pattern comprising a combination of minimum run lengths from the viewpoint of edge shift, and an optical disc apparatus implementing the method. From the target signal level that varies depending on the read signal, a target signal is generated based on a decoding result, and an error target signal is generated in which the decoding result is edge-shifted. The signal quality is evaluated by calculating a Euclidean distance between these signals and the read signal. A virtual state that is not included in the Viterbi decoder and that is less than the minimum run length is defined, and a target signal level for the virtual state is generated using a target signal level table inside the Viterbi decoder, based on the concept of convolution. In this way, the signal quality can be evaluated by the same method as mentioned above even in cases where the pattern of a combination of the minimum run lengths has edge-shifted.