228 results about "Data aided" patented technology

A method, system, and program for managing failover of J2EE compliant middleware in a high availability system are provided. A primary node and a secondary node each run the same J2EE compliant middleware stack comprising layers including a load balancer, a web server, a web application server, a message control server, a monitoring server, and a database control server. In the primary node, all layers are active. In the secondary node, part of the layers are active and part of the layers are in standby. A data replication partition shared between the primary node and the secondary node includes persistent resource data accessible to a selection of the layers of the primary node. A heartbeat controller monitors each node, including the middleware stack, and upon detection of a failure, controls transfer of the services provided by the primary node to the secondary node by transferring virtual IP addresses from the primary node to the secondary node, remounting the data replication partition for access by the secondary node, and activating the standby layers which require access to the data in the data replication partition.

A method is disclosed that a Mobile Station MS performs at switch-on to search the most favorable target cell in UMTS systems like the 3GPP CDMA—LCR (Low Chip Rate) option at 1.28 Mcps—TDD (Time Division Duplex) mode and the equivalent TD-SCDMA (Time Division—Synchronous CDMA). Signal at the MS antenna is the sum of different RF downlink frames coming from different carriers in the assigned frequency ranges. A DL synchronization timeslot and a BCCH TS0 are both transmitted with full power in the frames, the first one includes one out of 32 SYNC codes assigned on cell basis. Following a conventional approach the absence of a common downlink pilot and without prior knowledge of the used frequencies would force the MS, for all the frequencies of the channel raster stored in the SIM card, the correlation of the received frame with all the 32 SYNCs stored in the MS, in order to detect the BSIC of a cell to which associate the power measures. Following the two-step method of the invention the power measures are performed in two-step scan of the PLMN band without interleaved correlation steps; once a final frequency is selected the respective frame is the only correlated one. At least one frame duration about 5 ms long of the whole 15 MHz bandwidth is acquired, IF converted, A/D converted and the digital set is stored. A rough scan is performed multiplying the digital set by a digital IF tuned in steps wide as the channel band (1.6 MHz) along the 15 MHz band, and filtering the baseband signal with a Root Raise Cosine low-pass filter. The 5 ms baseband signal is subdivided into 15 blocks of half timeslot (337.5 μs) and the power of each block is measured. The power of the strongest block indicates the priority of the respective frequency. The strongest power values are put in a Spectral Table together with respective frame load indicators. The load indicator is the percentage of timeslots in a frame almost equally loaded as the strongest block. The three strongest frequencies are selected for the successive scan. The second step search is performed like the first one but the IF steps are now 200 kHz wide and cover the only 1.6 MHz spectrum around a selected frequency. A final frequency is selected for the successive correlation step. Then the frequency error of the MS reference oscillator is corrected with data-aided techniques and a calibration value stored for successive connections (FIG. 9).

Data from GPS satellites within the field of view of a ground station are retransmitted to LEO satellites, such as Iridium satellites, and cross-linked if necessary before being transmitted to a user. The user is then able to combine the fed-forward data with data received directly from GPS satellites in order to resolve errors due to interference or jamming. Iridium and data aiding thus provides a means for extending GPS performance under a variety of data-impaired conditions because it can provide certain aiding information over its data link in real time.

A data processing system for delivering an open profile personalization system based profile data structures that contain one or more interest nodes. The interest nodes include respective sets of targets and qualifiers, where the targets and qualifiers comprise typed-attributes to be used in the filtering of information files for delivery as a result set for the interest nodes. Targets and qualifiers are applied the typed-attributes of available information files to produce the filtered set. Web pages showing the personalized results include tools based on sophisticated content analysis to assist the user in creation and editing of the open profile. A method for presenting and updating the web pages is responsive to the use of these tools.

The present invention provides systems and methods for navigational signal tracking in low power mode to conserve the power of handheld navigation receivers. In an embodiment, the receiver cycles between sleep and wakeup states. During the sleep state, most of the components of the receiver are powered off to conserve power, and during the wakeup state, the receiver tracks navigational signals. In an embodiment, the duty cycle of the sleep/wakeup states depends on the receiver dynamic state, e.g., whether the receiver is accelerating. In another embodiment, during the wakeup state, the receiver selects a tracking mode based on the signal strength. Under weak signal conditions, a tracking mode using a long integration to track the satellite signal is disclosed. In one embodiment, a tracking mode tracks the navigation signal by performing data aided integration using known or predicted data bits, such as the TLM and HOW words.

A network driving environment integrated perception model based on a convolutional and hollow convolutional structure simultaneously realizes object detection and semantic segmentation. A video imageof a road environment is shot through a forward-looking camera system mounted on a vehicle. The residual network model is used to get the bottom feature map of the image. The converged network is designed, which includes two sub-modules: object detection and semantic segmentation. The two modules share the bottom feature map. Among them, the object detection module is responsible for predicting the confidence level of the object frame and the category, and the semantic segmentation module is responsible for predicting the pixel level of each category. The appropriate loss function is selectedfor each of the two modules, and the perceptual model tends to converge in both modules after alternate training. Finally, the joint loss function is used to train the two modules simultaneously to get the final perceptual model. The model can simultaneously complete object detection and semantic segmentation with small computation amount, and the perceptual model uses a large amount of data of object detection to assist the semantic segmentation module to learn the image distribution law.

The invention relates to an earth face evapotranspiration remote sensing inversion method and system based on MODIS data. The earth face evapotranspiration remote sensing inversion method comprises the following steps that (1), a research area is confirmed, relative MODIS data porducts in the research area are achieved and pretreated; (2), a scatter diagram of space change information is built by the utilization of the pretreated MODIS data products, a remote sensing inversion of pixel sized surface evaporation ratio EF is conducted; (3), according to the relative MODIS data products, remote sensing inversions of pixel sized surface net radiation Rn and soil heat flux G are conducted; (4), according to the surface evaporation ratio EF, the surface net radiation Rn and the soil heat flux G, a remote sensing inversion of pixel sized earth face evapotranspiration LE is conducted. The earth face evapotranspiration remote sensing inversion method only needs to input the MODIS data, the problem that the current evapotranspiration remote sensing inversion usually needs more ground observation data to assist is solved, and the earth face evapotranspiration remote sensing inversion method can be used for the evapotranspiration remote sensing inversion in the area with no data or with few data.

A quadrature transceiving system for compensating a direct current (CD) offset, a gain imbalance and a phase imbalance between an I-channel signal and a Q-channel in a quadrature transmitting system is disclosed. The quadrature transceiving system includes a transmitter for detecting a DC offset, a gain imbalance and a phase imbalance by using an average of a data aided signals included in a RF transmitting signal and compensating one of the I-channel and the Q-channel based on the detected imbalances and DC offset; and a receiver for detecting a DC offset, a gain imbalance and a phase imbalance by varying loop filter gain and compensating one of the I-channel and the Q-channel based on the detected imbalances and DC offset.

Tracking digital asset infringement activities and infringers on peer-to-peer networks. One method for assessing notice effectiveness of unauthorized distributors of content on a peer-to-peer network comprises processing peer data from a plurality of peers on the network, wherein the peer data aids in identification of individual unauthorized distributors. The embodiment includes creating a trial with a trial base population of the unauthorized distributors and a trial capture window, determining metrics for measuring the notice effectiveness, selecting a randomization methodology for the trial, performing the trial with the trial base population over the trial capture window according to the randomization methodology and issuing notices to some of the unauthorized distributors. The method also includes characterizing the unauthorized distributors into characterized data of at least one of characterization of unauthorized distribution activity and characterization of notice actions, and segmenting the characterized data into groupings according to one or more variables.

Some improvements to the conventional algorithms for data aided frequency synchronisation in cellular systems are introduced in a new method executable by the user equipments of various standards, i.e. 3GPP CDMA-TDMA, FDD mode at 3.84 Mcps, TDD mode at 3.84 Mcps, TDD mode at 1.28 Mcps; CWTS TD-SCDMA; GSM/DCS/GPRS. The method begins to obtain the suboptimal frequency errors Deltafi using a well known formula which calculates the argument of the autocorrelation over a subset of the baseband samples of the detected training sequence. The errors Deltafi are stored into a shift register L-position long and averaged to obtain an estimated frequency error Deltafi used for recursively correcting the reference frequency of the local oscillator, as: fi=fi-1+KDeltafi where K (0<=K<=1) is a weighting factor. Contrarily to the simple averaged error of the prior art, a sign criterion is used by which the average is performed on the only terms having the most recurrent algebraic sign among the stored terms Deltafi. The content of the shift register is corrected after each non-null frequency correction by subtracting K.Deltafi to all the stored terms Deltafi. Besides the frequency is corrected upon the following optional conditions, each other independents: The number of terms Deltafi having equal algebraic sign is greater than a constant alpha lower than L. The standard deviation sigma of the averaged terms Deltafi is lower than beta.sigmaold, being sigmaold the sigma of the last non-null frequency correction, and beta a constant >=1. After a minimum number gamma of iterations between two non-null frequency corrections are spent, being gamma a constant comprised between 1 and L. According to another variant the iterations of the recursive update are subdivided into an initial group with a higher K value for achieving fast convergence and a subsequent group with a lower K for achieving the required accuracy (FIG. 13).

The invention discloses an indoor navigation method based on the combination of region location, inertial navigation and map path. The indoor navigation method comprises the following steps: S1, region identification location; S2, inertial navigation; S3, map path data aided navigation. According to the invention, the indoor navigation method heavily relies on sensor data and map path data of a terminal and less relies on wireless signals, so that the laying and maintenance costs are greatly reduced; meanwhile, the location and navigation technology for cooperating the sensor data, the map path data and the wireless signals greatly improve the accuracy of indoor location and navigation.

The invention discloses a method and device for identifying a target object in a road, and relates to the technical field of computers. A specific embodiment of the method comprises the steps of collecting point cloud data of a road, wherein the point cloud data comprises three-dimensional space coordinate information and reflection intensity information of each point cloud; converting the point cloud data into four-dimensional semantic targets based on the three-dimensional space coordinate information and the reflection intensity information of each point cloud, and clustering the four-dimensional semantic targets to obtain a target point cloud cluster; and identifying a target object in each target point cloud cluster. According to the embodiment, sample learning and other data auxiliary registration are not needed, and the target object can be fully automatically and rapidly identified based on the spatial features of the three-dimensional point cloud data, and the hardware cost isreduced while the calculation process is simplified.

A system and method of timing estimation for use in a digital receiver within a communication system. An algorithm calculates the timing offset by evaluating the spectral component at the symbol clock frequency. The spectral component is generated using a nonlinearity operation. However, the maximum likelihood non-data-aided timing estimation equation reveals an alternative approximation for the logarithm of the hyperbolic cosine function present in the maximum likelihood equation, which offers a compromise between implementation complexity and variance performance. The estimated timing offset is then fed to a timing correction unit, which calculates the data samples corresponding to the sampling clock phase and removes the redundant samples. The ideal sampled signal is then forwarded to additional synchronization and functional units for further processing.

The invention discloses a satellite-borne AIS signal serial separation method based on parameter estimation. The method comprises the steps that a cross-correlation algorithm is used for conducting time delay and frequency offset combined estimation on mixed satellite-borne AIS baseband signals, and the signals are corrected according to an estimation result; incoherent detection and CRC verification are conducted on the corrected signals to obtain a correct sequence, parameter estimation under data assistance is conducted by using the sequence to obtain amplitude information and phase information of the mixed signals; number re-modulation is conducted on the detected code element sequence by using delay, frequency offset, phase and amplitude which are obtained through estimation to construct one route of modulation signal, the route of constructed signal is subtracted from the mixed signals, and then separation of one route of signal is realized; repeated separation is conducted on the rest of the mixed signals, and then serial separation of the mixed signals is realized. The satellite-borne AIS signal serial separation method based on parameter estimation solves the problem that in a satellite-borne AIS system, correct detection is hard to realize due to aliasing caused by slot collision which is generated when the receiving end of a satellite receives signals.

In a transmission system that employs terrestrial repeaters to supply signals to mobile receivers, an auxiliary channel is added in addition to a primary channel, at the terrestrial repeaters to transmit data of a local nature. The auxiliary channel can carry local data, which could be different at each terrestrial repeater and, hence at each different metropolitan area. The primary channel carries the data transmitted in the global network or other wide area network. In this manner pre-existing receivers in use prior to the addition of the auxiliary channel can still receive the global data. Another advantage is that a user only needs to tune to the auxiliary channel, and as the mobile receiver moves from one metropolitan area to another the data content of the auxiliary channel is automatically changed to that of the new metropolitan area. This is realized by adding the auxiliary channel at each desired terrestrial repeater. The primary channel including the global data content is supplied to the repeater in any desired manner, for example, a satellite network or some other terrestrial network. Before the global data content is re-transmitted the local data content intended for this metropolitan area only is added via the auxiliary channel for transmission. Then, the combined global and local data content is re-transmitted by the repeater.

Data aided carrier phase and symbol timing synchronizers are implemented at baseband as digital modulators isolating input signal inphase and quadrature component signals fed into inphase and quadrature Laurent transforms that function as data detector to provide odd and even data bit multiplexed output data signal while cross coupling the inphase and quadrature transformed outputs for removing data modulation in error signals to correct phase errors and timing errors in the received signal so as to provide reliable data demodulation of noisy received signals having dynamic carrier phase and symbol timing errors as found in continuous phase modulation communications systems such as Gaussian minimum shift keying communications systems.

A data-aided, multi-symbol phase estimation (MSPE) scheme is described for improving receiver sensitivity in the direct-detection of optical differential multi-level phase-shift keying (ODmPSK) signals including optical differential quadrature phase-shift keying (ODQPSK) signals, ODQPSK signals with amplitude shift keying (ODQPSK+ASK), optical differential 8-level phase-shift keying (OD8PSK) signals with eight phase levels, and optical differential phase-shift keying signals with more than eight phase levels. The use of data-aided MSPE substantially reduces the “differential detection penalty,” with receiver sensitivity approaching that of coherent detection schemes.

A frequency compensation circuit for compensating for a frequency offset in a received signal, the received signal including a periodically repeated pilot sequence for phase locking. The circuit comprises a phase estimator for estimating a phase of the received signal; a phase compensator, associated with the phase estimator, for compensating for the phase; a frequency estimator, comprising a maximum likelihood estimator comprising a first modification for estimating a frequency offset which is small relative to a symbol time, from the pilot sequence, the frequency estimator being connected downstream of the phase compensator; and a frequency compensator for applying a compensation to the signal, thereby to compensate for the frequency offset. The compensator is suitable for the exacting conditions of the DVB-S2 standard.

Methods, systems, and apparatuses for data-assisted content programming are described. Link access data for a website is collected, such as numbers and times of views and clicks for links of the website, and link generated revenue information. The link access data is optionally stored. A link performance measure is generated for a link based on the link access data. An indication of the calculated link performance measure for the link is graphically displayed in a content scheduler. The indication may be based on an actual click through rate for the link, on an average click through rate for links in a module in which the link resides, link user engagement information, revenue generated by the link, or on other link access data. The content scheduler may display a website content schedule timeline or a webpage preview that includes the graphical indication.

The invention provides methods and apparatuses to detect spectrum inversion based on estimated frequency offset in carrier signal. In one embodiment, a receiver includes an I/Q swap module to output an in-phase component and a quadrature-phase component; a frequency offset estimator to determine an offset in carry frequency of the in-phase and quadrature-phase components; and a spectrum inversiondetector coupled to the frequency offset estimator and the I/Q swap module. The spectrum inversion detector is configured to signal the I/Q swap module to swap the in-phase component and the quadrature-phase component when an absolute value of the offset in carry frequency is above a predetermined threshold.

The present invention provides an apparatus for transmitting data using turbo code. The apparatus includes an auxiliary bit adding unit configured to add padding bits to information bits, a convolutional turbo code (CTC) encoder configured to encode the padding bit-added information bits using turbo codes to generate coded data, a padding removing unit configured to remove the padding bits from the coded data, and a transmission processing unit configured to transmit the padding bit-removed coded data. The auxiliary bit adding unit adjusts the length of the padding bits according to a maximum size of an input that can be processed by the CRC encoder, and adds the length-adjusted padding bits to the information bits. Limited radio resources can be effectively used and the efficiency of data transmission can be improved.

The present invention provides systems and methods for enabling a navigation signal receiver to perform both data assisted and non-data assisted integration to provide better integration during signal acquisition, reacquisition and tracking. In data assisted integration mode, a receiver uses known or predicted data bits to remove the modulated data bits of a received signal prior to integration. In non data assisted integration mode, when the data bits are not known or predictable, the receiver uses an optimal estimation or maximum likelihood algorithm to determine the polarities of the modulated data bits of the received signal. This may be done by determining which of various possible bit pattern yields the maximum integrated power. When the modulated data bits are not known or predictable over a limited range, the receiver carries out data assisted integration over the known or predictable data bits and additional non data assisted integration.