522results about How to "Maximize throughput" patented technology

Adaptive modulation techniques for multi-antenna transmissions with partial channel knowledge are described. Initially, a transmitter is described that includes a two-dimensional beamformer where coded data streams are power loaded and transmitted along two orthogonal basis beams. The transmitter optimally adjusts the basis beams, the power allocation between two beams, and the signal constellation. A partial CSI model for orthogonal frequency division multiplexed (OFDM) transmissions over multi-input multi-output (MIMO) frequency selective fading channels is then described. In particular, an adaptive MIMO-OFDM transmitter is described in which the adaptive two-dimensional coder-beamformer is applied on each OFDM subcarrier, along with an adaptive power and bit loading scheme across the OFDM subcarriers.

A communications network comprising a wireless local area network includes a plurality of access points connected to a host computer and each other, and a plurality of mobile units with each mobile unit being arranged for association with at least one access point. The mobile units are arranged to periodically scan for and identify the most eligible access point for association at the highest data rate on the basis of a performance criteria at the current data rate.

An interface point network (IPN) and a method for communication with a laboratory information system using an IPN, wherein the IPN includes at least one host computer in communication with at least one laboratory instrument, the laboratory information system and an interface point server in communication with the host computer and the laboratory information system, the interface point server being configured to function as a communication interface between the host computer and the laboratory information system in a manner responsive to a predetermined communication protocol. Use of bar code and RFID labels for tracking samples and in maintaining sample data is described.

A novel massively parallel supercomputer of petaOPS-scale includes node architectures based upon System-On-a-Chip technology, where each processing node comprises a single Application Specific Integrated Circuit (ASIC) having up to four processing elements. The ASIC nodes are interconnected by multiple independent networks that optimally maximize the throughput of packet communications between nodes with minimal latency. The multiple networks may include three high-speed networks for parallel algorithm message passing including a Torus, collective network, and a Global Asynchronous network that provides global barrier and notification functions. These multiple independent networks may be collaboratively or independently utilized according to the needs or phases of an algorithm for optimizing algorithm processing performance. Novel use of a DMA engine is provided to facilitate message passing among the nodes without the expenditure of processing resources at the node.

This invention provides an apparatus and method to aggregate individual fibre channel data streams in their native mode and to extend connectivity of fibre channel storage area networks across wide geographical distances over a high-speed data channel with forward error correction

An apparatus and method for cooperative relay in a multiple-antenna wireless communication system based on relay stations (RSs) are provided. The apparatus includes a serial / parallel converter for dividing data into N number of streams, a channel estimator for calculating a first transmission rate at which a RS performing the cooperative relay can perform decoding and a second transmission rate at which all relay stations performing the cooperative relay can commonly perform decoding, and determining transmission rates for each of the N-number streams, and an adaptive modulation and coding (AMC) unit for encoding and modulating the N-number streams according to their respective transmission rates.

Disclosed is a method for uplink scheduling in a communication system. The method for uplink scheduling in a communication system having a cellular structure hopping between sub-channels according to a predetermined rule whenever a signal is transmitted The communication system dividing a whole frequency band into a plurality of sub-carrier bands and including the sub-channels which are sets of the sub-carrier bands. The method includes determining a number of sub-channels to be allocated to a mobile station such that throughput of the mobile station is maximized based on a first predetermined condition in which a mobile station having a superior channel state is allocated with a greater number of sub-channels than a mobile station having an inferior channel state, and determining a modulation and coding scheme level according to a signal-to-interference and noise ratio (SINR) of a downlink channel reported by the mobile station based on a second predetermined condition capable of improving a channel state of the mobile station having an inferior channel state.

A method and apparatus are provided for communicating data across a communication link, in a manner that senses and dynamically adapts to the simultaneous transmission of voice information across the local loop. In accordance with one aspect of the invention, a method is provided for dynamically communicating data over a local loop using a modem comprising the steps of transmitting data in a full-band transmission state, sensing a band-limiting condition, and adjusting the transmission of data from the full-band transmission state to a bandlimited transmission state, in response to the sensing step. In accordance with the method, data may be transmitted by the modem across the local loop at the same time that voice information is communicated via telephone across the same local loop. A significant aspect of the present invention is the dynamic allocation of the data transmission bandwidth, whereby the invention senses a condition indicative of whether voice information is being communicated. If so, then the system shifts and / or narrows the data transmission bandwidth to allow for voice communications without interference from or with the data transmission. However, when no voice information is being communicated, the invention dynamically allocates the data transmission bandwidth to utilize at least a portion, if not all, of the frequency band otherwise used for communicating voice information.

A system is disclosed for the automatic detection of fraudulent activity on a transaction network, for which each transaction over the network has an associated identifier. In one embodiment, the system includes voice comparison means for comparing a first sampled voice of a user of a first transaction with a subsequently sampled voice of a user of a subsequent transaction having an identical identifier to that of the first transaction. Control means in the form of a voice-based fraud detection engine is provided for determining, from said comparison, a profile of user usage that is representative of a total number of different users of the associated identifier. In a preferred embodiment, the system also includes voice sampling means for sampling a voice of the user of the first transaction to generate a first voice sample.

A WCDMA system includes a Base Station (BS) transmitter, or forward transmitter and a pilot channel that transmits control signals between the BS and a Mobile Station (MS) to reconfigure their transmitter / receiver. Reconfiguration is performed according to the prediction of the channel attenuation and the threshold set at the BS or MS based on its channel power probability density function separated into three distinct equal probable regions. In one embodiment, Seamless Rate Change (SRC) / Transmitter Power Control (TPC) logic uses the predicted channel attenuation to signal both the transmitter and the receiver in a channel to reconfigure their transmit power level according to the power density function (pdf) of the channel power and threshold level. A transmission rate is reduced when the power level is below the threshold and increased when the channel power is above threshold. The pilot channel is used to signal the mobile station and the base station.

A WCDMA system includes a Base Station (BS) or forward transmitter and a pilot channel that transmits control signals between a Mobile Station (MS) and BS to reconfigure their transmitter / receiver according to the prediction of the channel power and channel power probability density function separated into three distinct equal probable regions. Data signals are encoded using a one-half Viterbi encoder and interleaved. The interleaved data bits are modulated using Quadrature Phase Shift Keying (QPSK) modulation. The QPSK data is multiplexed with the pilot channel and spread by an appropriate code in an OFDM transmitter modified by a long code. Output of the transmitter may be provided to two diverse antennas for reliable communications to the receiver. Data may be received at two diverse antennas. The outputs are provided to match filters coupled to a coherent rake receiver and a channel prediction system. The future attenuation of the channel coefficients and power are determined by the prediction system for several milliseconds. The power levels of each finger in the Rake receiver can be predicted and the strongest ones used in determining the optimum transmitter power or rate control for operating the system transmitters and receivers based on computing a long range power prediction of each finger of a rake receiver.

A fully automated method and apparatus is disclosed to laminate various structural articles with a layer of resin impregnated fiber tape. The tape laying member removes a releasable backing layer from the tape being employed, then deposits the unbacked tape on the surface of the structural article, and finally severs the end of the tape being deposited. An automated cut and restart procedure is employed in the present tape laying member to increase tape throughput.

The present disclosure is a novel utility of a software defined radio (SDR) based Distributed Antenna System (DAS) that is field reconfigurable and support multi-modulation schemes (modulation-independent), multi-carriers, multi-frequency bands and multi-channels. The present disclosure enables a high degree of flexibility to manage, control, enhance, facilitate the usage and performance of a distributed wireless network such as flexible simulcast, automatic traffic load-balancing, network and radio resource optimization, network calibration, autonomous / assisted commissioning, carrier pooling, automatic frequency selection, frequency carrier placement, traffic monitoring, traffic tagging, pilot beacon, etc. As a result, the SDR DAS can increase the efficiency and traffic capacity of the operators' wireless network.

A file system that balances the loading of filers and the capacity of drives that are associated with the filers is described. The file system includes a first disk drive that includes a first unused capacity and a second disk drive that includes a second unused capacity, wherein the second unused capacity is smaller than the first unused capacity. The file system further includes a first filer that is configured to fill requests from clients through access to at least the first disk drive. The file system further includes a second filer that is configured to fill requests from clients through access to at least the second disk drive. The second filer is configured to select an infrequently accessed file from the second disk drive and to push the infrequently accessed files to the first disk drive, thereby improving a balance of unused capacity between the first and second disk drives without substantially affecting a loading for each of the first and second filers.

Multi-user (MU-) MIMO systems with quantized feedback are designed to maximize the sum-rate via scheduling and linear precoding. To maximize throughput over the network, quantized CSIT is sent through a low-rate feedback link feedback from a plurality of users back to a base station. The base station then determines a subset of the plurality of users to transmit one or more signals to based on the received feedback and determines a preceding matrix based on the received feedback from the plurality of users wherein the precoding matrix maximizes a sum-rate throughput for the subset of the plurality of users. Additionally, based on the received feedback, the base station designs a quantization codebook. This codebook may be designed off-line and / or online. The codebook and / or precoding matrix are used to transmit signals to the users.

Systems and methods are provided that facilitate distributed multichannel wireless communication and provide the highest level quality of service (“QoS”) guarantee and support extremely high bandwidth applications such as voice over internet protocol (“VOIP”) streaming audio and video content (including high definition), and multicast applications and also supports convergent networks, ad hoc networks, and the like. A modular MAC architecture provides a group of nodes with the ability to simultaneously communicate with each other using multiple separate communication channels during the same timeslots. The additional throughput gained by employing multiple communication channels is amplified by dynamically mapping the communication channels and timeslots in a network so that multiple channels can be reused simultaneously throughout the network during the same timeslot in a fashion that does not create collisions.

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.

A data transmission method in a MIMO-OFDM communication system including at least one receiver for receiving a signal through a plurality of reception antennas and a transmitter for selecting a transmission channel using channel information being fed back from the receiver and transmitting a signal through a plurality of transmission antennas. The method includes selecting a spatial subchannel in which when bits are added by applying at least two spatial modes having different multiplexing gains for an individual subcarrier in a frequency domain, the minimum power increment is required during application of each spatial mode; allocating a spatial mode that requires the minimum total accumulated power, for each subcarrier; and selecting all subcarriers in the order of a subcarrier that requires the minimum power increment.

Computer-based methods and apparatuses, including computer program products, are described for detecting and limiting focused server overload in a network. A feedback message is received from a downstream server, wherein the feedback message includes a communication protocol statistic. The methods and apparatuses determine which of one or more counters that store a number of feedback messages received that include the statistic, from an array of counters, are associated with the downstream server using one or more hash functions based on information included in the feedback message. The one or more counters are incremented in response to the feedback message including the statistic. Using the one or more hash functions, a value of the number stored in the one or more counters is determined. The value is determined to be indicative of an overload episode in the network for the downstream server based on whether the value satisfies a predetermined criteria.

A communication system is disclosed that allows high data-rate transmission of data between components. N-bit parallel data is transmitted in K-frequency separated channels on the transmission medium so as to fully take advantage of the overall bandwidth of the transmission medium. Additionally, a cross-channel interference filter in a receiver section corrects for cross-channel interference in the communication system. As a result, a very high data-rate transmission can be accomplished with low data-bit transmission on individual channels. A transmitter system and a receiver system are described for the communication system.

A camera based vision system that recognizes and maximizes belt area utilization. A plurality of cameras are positioned at flow entry points of feed conveyors and at the singulator. The control algorithm recognizes individual items area, the rate at which individual objects are passing, and the area utilization of the collector belt. The video camera and computer based conveyor package management system monitor and control the number and size of the packages present on the infeed conveyors, collector conveyor, singulator conveyor and sorting conveyor in a package handling system wherein the camera data is used to measure the available area or space on the conveyors to maintain a desired density of packages on selected conveyor(s). The conveyor speed is controlled as a function of occupancy on a collector or just prior to a singulator or receiver.

A method for increasing the performance of a transmission control protocol (TCP) session transmitted over a telephony local loop between a client and a server. The method comprises: providing a proxy system between the client and the server, the client and the server being coupled through a network; intercepting, at the proxy system, a request transmitted by the client; transparently establishing a first TCP session between the client and the proxy system, and a second TCP session between the proxy system and the server; and storing data, received from the server in response to the request, in a buffer at the proxy system, when throughput between the server and proxy system is greater than throughput between the proxy system and the client.

A routing device for routing streams at a node in a packet transmission network receives a stream request, reads specified parameters and any values for loss and delay already incurred at preceding nodes in the network, or specified parameters as modified to take account of loss and delay already incurred at preceding nodes in the network, to determine in conjunction with existing streams already being handled by the routing device whether to accept or reject the stream, allocates one or more buffers to the stream if the stream request has been accepted, transmits the stream request with modified values for loss and delay, or with modified parameters to take account of loss and delay incurred at this and preceding nodes in the network if the stream request has been accepted, and returns a fail signal if the stream request has been rejected.

Transmission destination determiner 301 selects individual communication terminal apparatus as candidates to transmit packets to and determines a transmission destination apparatus based on CQI signals from these communication terminal apparatuses. Transmission power determiner 302 monitors transmission power resources and determines the transmission power of an HS-PDSCH and the transmission power of a pilot channel. HS-PDSCH SIR estimator 303 estimates the SIR of the HS-PDSCH at the transmission destination apparatus based on the CQI signal and the transmission power. MCS determiner 304 determines the maximum TBS based on the HS-PDSCH SIR and indicates an MCS corresponding to the determined TBS to modulator 153. By this means, it is possible to maximize throughput in consideration of the transmission power of the HS-PDSCH.

A System for providing communications over a communications network includes a communications interface and processor. The communications interface communicates over the communications network. The processor directs a communications scheduler to determine at least one metric for a path within the communications network. The processor also selects a data flow for the path and determines whether to transmit a packet in the selected data flow based on the at least one metric. The processor then directs a communications protocol handler to generate the packet for the selected data flow.