287results about How to "Error rate" patented technology

A method for making a laser driver circuit for burst mode is described. The method includes the following steps: First, a continuous mode laser driver circuit is selected, the chip having a temperature compensation output, a bias current setting input, and a reference current setting input. Next, the temperature compensation signal is converted to a reference current setting signal via a first bias adjustment circuit, and the reference current setting signal is input to the reference current setting input. Then, the bias current setting input is connected to ground via a second bias adjustment circuit. The reference current setting signal automatically adjusts the high level and the low level of the eye diagram of the laser according to the environmental temperature, so that the high level and the low level are kept stable to reduce the bit error rate in transmission.

A method and system for communicating insurance related services between an insured and an insurer through an Internet communication scheme includes a processing system for processing acquired event and sensored data to compute the cost of insurance for the same period as the data is acquired. An enhanced Internet communication scheme provides an insured access to the acquired data and its processing through enhanced presentation systems (e.g., maps with usage, service or special event processing or even automobile service diagnostics.) In addition, communication packages can provide estimates based upon user-supplied information identifying projected usages.

A method and system is described that flexibly and efficiently adjusts uplink data transmission rates in a wireless communication system. In particular, a transport format limit indicator (TFLI) indicating the allowed changes to available transport formats, including, for example, the maximum allowed uplink data transmission rate, is sent by a network node to a user equipment, without a prior request from the user equipment for such information. The user equipment may then adjust its uplink rate based on the TFLI when desired without having to make a request for rate information from the network node.

A broadcasting base station device transmits broadcast signals modulated by a hierarchical modulation scheme to a mobile terminal device. A hierarchical modulation setup section compares the reception quality of the broadcast signals at the location of the mobile terminal device to predetermined reference quality. Based on the result of the comparison, the hierarchical modulation setup section specifies a hierarchical modulation scheme. For example, the constellation in each quadrant is reduced or enlarged. Accordingly, the broadcasting base station device can transmit optimal broadcast signals that match with actual reception quality to each mobile terminal device.

A method and system provide the ability to automatically recognize biological particles. An image of biological particles (e.g., airborne pollen or urine) is obtained. One or more parts of the image are detected as containing one or more particles of interest. Feature vector(s) are extracted from each detected part of the image. Non-linearities are applied to each feature vector. Each part of the image is then classified into a category of biological particle based on the one or more feature vectors for each part of the image.

A fiber optic transmitter comprising a digital driver adapted to adjust the crossing point of a digital base signal, an optical source adapted to receive the digital base signal and produce a frequency modulated optical signal, and an optical spectrum reshaper adapted to convert the frequency modulated optical signal to an amplitude modulated optical signal. A method for transmitting a signal, comprising: adjusting the crossing point of a digital base signal; providing the adjusted signal to an optical source to produce a frequency modulated optical signal; and providing the frequency modulated optical signal to an optical spectrum reshaper to convert the frequency modulated optical signal to an amplitude modulated optical signal.

An apparatus for adjusting the transmission bit rate and fragmentation threshold of a wireless station in response to transmission errors is disclosed. In particular, the illustrative embodiment of the present invention is based on a wireless station that employs both an IEEE 802.11 radio and a Bluetooth radio, and determines whether transmission errors of the IEEE 802.11 radio are due to fading, or interference from the Bluetooth radio. It will be clear to those skilled in the art how to make and use alternative embodiments of the present invention for protocols other than IEEE 802.11 and Bluetooth, as well as stations that employ wireline or non-RF-wireless transceivers.

A base station has a time correlation calculating unit for estimating a variation-with-time characteristic of radio link quality using radio downlink quality information reported by a mobile station, a target error rate setting unit for changing over a target error rate adaptively using this variation-with-time characteristic, and an MCS decision unit for deciding a modulation scheme and / or encoding rate, in such a manner that packet error rate becomes equal to the target error rate, using the radio link quality information as well as reception success / failure information reported by the mobile station. The base station transmits a packet based upon the modulation scheme and / or encoding rate decided.

An integrated maximum a posteriori equalization and turbo product coding (IMAP-TPC) system for optical fiber communications systems (OFCS) is provided that uses probabilistic characterization of the electrical current in the presence of inter-symbol interference (ISI) and noise to compensate their effects and improve the bit error rate. In the IMAP-TPC system, turbo product code (TPC) decoding is integrated with a symbol-by-symbol maximum a posteriori (MAP) detector. The MAP detector calculates the log-likelihood ratio of a received symbol using the conditional electrical probability density information, and hence obtains a much more accurate reliability measure than the traditional measure used in the TPC decoder.

A circuit arrangement for correcting magneto-resistive head asymmetry includes a shift circuit which receives a read signal from a magneto-resistive head, and a polarity signal indicative of the polarity of any asymmetry of the read signal. Depending on the polarity of the asymmetry, the shift circuit either adds or subtracts a shift voltage to the read signal to produce a shifted read signal. The shift circuit outputs the read signal, the shifted read signal, and the shift voltage. First, second and third gain circuits are provided, which receive the read signal, the shifted read signal, and the shift voltage, respectively, and which each receive a respective control signal. The first, second and third gain circuits provide respective outputs amplified proportionally based on the respective control signals. Control circuitry provides the polarity signal to the shift circuit and the respective control signals to the first, second and third gain circuits, based on an amount of correction required. A common-mode-feedback circuit adjusts for changes in the common-mode caused by the waveform shaping.

Encoding / decoding memory devices and methods thereof may be provided. A memory device according to example embodiments may include a memory cell array and a processor including at least one of a decoder and an encoder. The processor may be configured to adjust a redundant information rate of each channel, where each of the channels is a path of the memory cell array from which data is at least one of stored and read. The redundant information rate may be adjusted by generating at least one codeword based on information from a previous codeword. Therefore, example embodiments may reduce an error rate when data is read from and written to the memory device.

Memory devices and / or encoding / decoding methods are provided. A memory device may include: a memory cell array; an internal decoder configured to apply, to a first codeword read from the memory cell array, a first decoding scheme selected based on a characteristic of a first channel in which the first codeword is read to perform error control codes (ECC) decoding of the first codeword, and apply, to a second codeword read from the memory cell array, a second decoding scheme selected based on a characteristic of a second channel in which the second codeword is read to perform the ECC decoding of the second codeword; and an external decoder configured to apply an external decoding scheme to the ECC-decoded first codeword and the ECC-decoded second codeword to perform the ECC decoding of the first codeword and the second codeword.

Apparatus for providing assistance in manual sorting of articles of mail performed by one or more operators having at their disposition storage elements or pigeon-holes corresponding to determined destinations, each article of mail containing at least one document. The apparatus has optoelectronic recognition means for identifying on an article of mail or on a document extracted therefrom, at least one item of data suitable for providing direct or indirect information about the destination of said article, comparator means for comparing said identified data item with a plurality of previously stored predetermined data items, allocation means for allocating a unique identity code to said recognized data item corresponding to a determined storage element allocated to a particular destination, and contactless transmission means for transmitting said identity code to all of the storage elements, each of said storage elements being provided with indicator means mounted on removable fixing means and responding selectively to said identity code.

A hierarchical data structure of digested payload information (e.g., information within a payload, or information spanning two or more payloads) allows a payload excerpt to be attributed to earlier network flow information. These compact data structures permit data storage reduction, while permitting efficient query processing with a low level of false positives. One example of such a compact data structure is a hierarchical Bloom filter. Different layers of the hierarchy may correspond to different block sizes.

A method for receiving a signal modulated according to a multilevel coding technique, comprising at least two coding levels each having different noise robustness, said signal including a plurality of symbols each comprising at least one bit, assigned to one of said coding levels, said method comprising at least one decoding iteration including successive steps of decoding each of said received bits, at least one of said decoding steps integrated the result of at least one possible previous decoding step. The invention is characterized in that it consists in decoding said bits according to a predetermined sequence taking into account the robustness of said levels, the bit(s) assigned to the decoding level having the higher noise robustness, called most robust level, being decoded first.

A method, apparatus and system for improving block error rate performance of a receiver having an iterative decoder in a communication system, the method, apparatus and system includes receiving an encoded frame of data, the encoded frame of data includes a quantity of code blocks where each code block has a corresponding code block size, determining a first maximum number of iterations for each of the code blocks of the encoded frame of data iteratively performing a decoding operation on a first code block until the occurrence of one of (a) the first maximum number of iterations has been reached and (b) the first code block has converged, and determining a second maximum number of iterations for the remaining code blocks of the encoded frame of data based on the number of actual iterations used to decode the first code block.

A controller sets an error count margin for each of multiple units of a non-volatile memory and detects whether the error count margin of any of the multiple units has been exceeded. In response to detecting that the error count margin of a memory unit is exceeded, the controller determines whether calibration of the memory unit would improve a bit error rate of the memory unit sufficiently to warrant calibration. If so, the controller performs calibration of the memory unit. In some implementations, the controller refrains from performing the calibration in response to determining that calibration of the memory unit would not improve the bit error rate of the memory unit sufficiently to warrant calibration, but instead relocates a desired part or all valid data within the memory unit and, if all valid data has been relocated from it, erases the memory unit.

A method for improving reliability of an electronic system by evaluating a soft error rate is disclosed. A gate-level representation of the electronic system is converted to a graph, the graph having vertices and edges that correspond to nodes and gates of the electronic system. Input vectors are generated, which correspond to inputs supplied to the electronic system. A soft error rate for the electronic system is evaluated during a simulated operation of the electronic system, and the evaluated soft error rate is correlated to a set of parameters used to configure the electronic system.

A central wireless microcomputer of a central wireless unit (transmitter) constituting a wireless AV system identifies a content type of video and audio data to be transmitted, according to EPG, and sets a transmission rate of the video and audio data to be transmitted, according to a detected communication condition. According to the content type thus identified, the central wireless microcomputer executes transmission rate modification control by modifying the transmission rate thus set, with reference to an MPEG rate. Thus, even when the communication condition deteriorates, it is possible to minimize deterioration of the video and audio data and maintain data transmission as much as possible.

A system involves a first SerDes link from a first integrated circuit (IC) to a second IC and a second link from the second IC to the first IC. Power consumption settings in circuitry of the first link are adjusted to control power consumption such that the bit error rate of the first link is maintained in a range, where the lower bound of the range is substantially greater than zero. Power consumption settings in circuitry for the second link are adjusted to control power consumption such that the bit error rate of the second link is maintained in range, where the lower bound of the range is substantially greater than zero. In one example, circuitry in the second IC detects errors in the first link and reports back via the second link. The first IC uses the reported information to determine a bit error rate for the first link.

N sets of feature vectors are generated from a set of observation vectors which are indicative of a pattern which it is desired to recognize. At least one of the sets of feature vectors is different than at least one other of the sets of feature vectors, and is preselected for purposes of containing at least some complimentary information with regard to the at least one other set of feature vectors. The N sets of feature vectors are combined in a manner to obtain an optimized set of feature vectors which best represents the pattern. The combination is performed via one of a weighted likelihood combination scheme and a rank-based state-selection scheme; preferably, it is done in accordance with an equation set forth herein. In one aspect, a weighted likelihood combination can be employed, while in another aspect, rank-based state selection can be employed. An apparatus suitable for performing the method is described, and implementation in a computer program product is also contemplated. The invention is applicable to any type of pattern recognition problem where robustness is important, such as, for example, recognition of speech, handwriting or optical characters under challenging conditions.

A cryptographic key distribution method, in which coherent light being suitable for optical fiber communication network is used and high security is secured, is provided. A sending end encodes random numbers so that symmetry probability distributions can be obtained at a receiving end, and also sets light intensity and a modulation index of signal light radiating from the sending end so that the SNR of an eavesdropper is less than 2 dB even when said eavesdropper uses a most suitable receiving equipment at the sending end, and also so that the SNR of the receiving end is more than −10 dB, and transmits signals. The receiving end calculates probability distributions of obtained signals and sets a discrimination threshold value after a set of random numbers was transmitted from the sending end. When the probability distributions have some abnormal states, it is judged that the eavesdropper exists, and distributing the cryptographic key is stopped and a fresh cryptographic key is distributed again.

In the method of handling mail items, while a mail item is on its first pass through the machine, the method consists in forming a digital image of the surface of the mail item, in deriving, from the image, a digital fingerprint characterizing the mail item, and in recording said digital fingerprint in a memory in correspondence with the bar code printed on the mail item. While the mail item is on its second pass through the machine, the method consists in reading the printed bar code that is printed on the mail item, and, if it has not been possible to extract completely the information contained in the printed code read off the mail item, in using said correspondence in the memory between the printed code that is printed on the mail item and the digital fingerprint that characterizes the mail item to continue machine-sorting the mail item, thereby contributing to reducing the error rate. The printed bar code that is printed on the mail item may be a mail item identity code, a customer applied identifier, or a sorting code for outward and / or inward sorting.

The automated detection of scene boundaries supports the user in browsing a video. Establishing the similarity between two respective frame sequences is made by choosing and comparing respective key-frames from each frame sequence, which are temporally as far apart from each other as possible but lie outside gradual transitions. Additionally or alternatively, film grammar- and probability-based taking into account of all types of transitions with respect to their separating and / or merging effect on the frame sequences surrounding the transitions and a differently weighted incorporation of the effects of the different types of transitions into uniting frame sequences k into scenes is provided. Thus, all types of transitions are incorporated in determining frame sequence boundaries as scene boundaries with a corresponding weighting, both their separating and merging effect is taken into account, and this knowledge is introduced on a probability basis into the decision in existing scene detection methods.

A method is provided for creating sequences for testing software created from data flow models and subjected to automatic test conditions by a data processing device and an executable test case generator software, whereby a test plan made up of individual test cases is generated by the test case generator software for the software to be tested. For each model block, test-relevant algorithms are implemented the form of a test case algorithm and a backward follow-up algorithm. In each test case, a value range for each of its input signals is assigned to a model block, by the test case algorithm. Each of such value ranges is followed up by means of the backward follow-up algorithm, in the system to be tested, through the individual blocks, up to the inputs of the system to be tested, and the results are checked and stored in memory.

Several subscriber signals are transmitted simultaneously and at the same frequency by a central transmitter to several decentralized receivers which do not cooperate with each other, by digital message transmission in a broadcast channel. A common transmission signal, which enables an error-free individual reception, should be generated with knowledge of all subscriber signals and of the current transmission conditions, by signal preprocessing methods on the transmission side. Known nonlinear precoding methods totally suppress the interference signals, so that the channel diversity cannot be used. In the claimed precoding method, the occurring interference signals are, on the contrary, taken into account. On the basis of a modulo arithmetic calculation, the transmission channel is not totally equalized, but virtually divided, so that the transmission of the subscriber signals is continued periodically; the signals are selected according to the minimal transmission power and pre-equalized, in a linear manner, and the residual interferences, still remaining between the subscriber signals, may assume special values from a preset set of values. The set of values is selected, so that the interference signals of the other subscribers are also merely reflected in the otherwise already existing periodic continuation and can be suppressed or used as required by a modulo decision, on the reception side.

In a system in which systematic code, comprising information alphabet elements to which parity alphabet elements have been added, is transmitted and received, (1) K0 dummy alphabet elements are added to K information alphabet elements to generate first code of K1 (=K+K0) information alphabet elements; (2) M parity alphabet elements, created from the first-code of K1 information alphabet elements, are added to this first code of K1 information alphabet elements, and the K0 dummy alphabet elements are deleted to generate systematic code of N (=K+M) alphabet elements; and (3) the systematic code is received on the receiving side, the K0 dummy alphabet elements are added to the received systematic code, and decoding of the code of N1 alphabet elements obtained by adding the K0 dummy alphabet elements, is performed.

Symbol timing for a wireless communication system, such as a multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) wireless LAN system, is determined by summing the powers for an appropriate set of channel impulse responses, integrating this power summation over an appropriate window (e.g., equivalent to the guard interval), and identifying the time at which the maximum integration occurs. Depending on the implementation, symbol timing can be determined for each receiver branch individually or for all receiver branches jointly. In either case, the determined symbol timing(s) can minimize the amount of inter-symbol and inter-channel interferences that are invoked in the system.

A method and modem for communicating serial input data over a transmission link. Serial input data is partitioned into parallel data elements prior to rotation by an invertible linear mapping. Resulting frames of parallel signal elements sequentially modulate a carrier, which is then transmitted over the link. After receipt of the modulated carrier from the link, the signal is demodulated and assembled into frames of parallel signal elements which are de-rotated by an inverse linear mapping. Thresholding the result of the inverse mapping recovers the parallel data elements, which are then re-assembled into serial output data. The linear mapping employs: 1) commuting rotation matrices for convolutionally rotating data vectors into signal vectors and vice-versa; 2) filter bank polyphase rotation matrices; or 3) computationally efficient multi-rate wavelet filter banks. Transmitter pre-emphasis places most of the information in lower baseband frequencies; complimentary de-emphasis occurs in the receiver. Logarithmic amplification of the baseband signal prior to carrier modulation improves modulation gain and transmit channel noise attenuation. Coefficients of the rotation matrix of the receiver are adaptively equalized to correct for transmission path distortion. FM double-side band is employed in systems requiring minimized cost and complexity. FM single-side band is employed in systems in which bandwidth reduction is desirable. AM is also employable.