402results about How to "Maximum performance" patented technology

The present invention provides a method and apparatus for increasing the performance of world-wide-web traffic over the Internet. A distributed network of specialized nodes of two types is dispersed around the Internet. A web client's requests are directed to a node of the first type chosen to be close to the client, and the client communicates with this node using a standard protocol such as HTTP. This first node receives the request, and communicates the request to a node of the second type chosen to be close to the request's ultimate destination (e.g., a web server capable of generating a response to the request.) The first node communicates the request to the second node using a different, specialized, protocol that has been designed for improved performance and specifically to reduce traffic volume and to reduce latency. The second node receives communication from the first node using this specialized protocol, converts it back to a standard protocol such as HTTP, and forwards the request to the destination computer or server. Responses from the destination to the client take the corresponding reverse route, and also are carried over a specialized protocol between the two nodes. In addition, these nodes can employ other techniques such as web caches that avoid or improve some communication steps. Thus, specialized, proprietary, or complex protocols and techniques can be quickly deployed to enhance web performance without requiring significant changes to the clients or servers.

A method for enabling intelligence at the edge. Features include: triggering by sensor data in a software layer hosted on either a gateway device or an embedded system. Software layer is connected to a local-area network. A repository of services, applications, and data processing engines is made accessible by the software layer. Matching the sensor data with semantic descriptions of occurrence of specific conditions through an expression language made available by the software layer. Automatic discovery of pattern events by continuously executing expressions. Intelligently composing services and applications across the gateway device and embedded systems across the network managed by the software layer for chaining applications and analytics expressions. Optimizing the layout of the applications and analytics based on resource availability. Monitoring the health of the software layer. Storing of raw sensor data or results of expressions in a local time-series database or cloud storage. Services and components can be containerized to ensure smooth running in any gateway environment.

MIMO transmission methods are applied to communicaiton systems in which a transmitter has more than one transmit antenna and a receiver has more than one receive antenna. Information to be transmitted is divided into a plurality of subsignals according to the number of used transmit antennas and each subsignal is processed separately before it is emitted by the respective transmit antenna. In the receiver the different receive signals are processed thus that subsignals are detected and decoded and the contribution of each detected and decoded subsignal is subtracted from the receive signals and whereby a feedback channel from receiver to transmitter is used to send control information to the transmitter depending on the receive situation. In order to optimize the usage of the MIMO channel the invention proposes the in the receiver the link quality of each subsignal is determined and information of each subsignal is transmitted to the receiver via the feedback channel and that in the transmitter properties of the subsignals are controlled by the link quality information.

The evolution of high rate data services within future wireless networks will call for new RF access technologies to enable substantial increases in overall system spectral efficiency at an acceptably low cost to the user. Space-Time Coding (STC) is an antenna array processing technology currently simulating considerable Interest across the wireless industry. The invention provides a space-time coding apparatus having an input, a trellis encoder, a modulator, a demultiplexer, and a set of signal outputs wherein the input is operable to receive a stream of data. This allows de-multiplexing to take place after coding and modulation has been performed. The trellis encoder comprises a convolutional encoder operable to sequentially group data to provide coded bits to provide QPSK symbols. By the selection of convolutional encoder rates and/or modulation alphabets STCs of any desired dimensionality may be produced including multi-dimensional codes.

Various embodiments of multi input multi output (MIMO) communication systems include a transmit Tomlinson-Harashima Precoding (THP) technique and a single carrier frequency domain equalization (SC-FDE) technique. Parallel THP-FDE and successive THP-FDE are proposed based on the minimum mean square error (MMSE) criterion. For the successive THP-FDE technique, where all transmit streams are subsequently precoded, both suboptimal and optimal MMSE ordering algorithm are set forth. Since the feedback processing is performed at the transmitter, no error propagation problem exists in the THP-FDE MIMO techniques, yielding significant performance improvements over conventional FDE MIMO techniques. Applying channel prediction and THP compensation techniques can also further enhance performance.

A computer implemented method for executing an ANSI SQL expression belonging to the SELECT-WHERE-equi-JOIN class on data residing in a distributed file system, said method comprising the steps of entering the ANSI SQL expression into a user interface; converting the ANSI SQL expression into a map-reduce program; running the map-reduce program on the distributed file system; storing the result set of the program in the distributed file system; and presenting the result set through a user interface.

A calibrated DC compensation system for a wireless communication device configured in a zero intermediate frequency (ZIF) architecture. The device includes a ZIF transceiver and a baseband processor, which further includes a calibrator that periodically performs a calibration procedure. The baseband processor includes gain control logic, DC control logic, a gain converter and the calibrator. The gain converter converts gain between the gain control logic and the DC control logic. The calibrator programs the gain converter with values determined during the calibration procedure. The gain converter may be a lookup table that stores gain conversion values based on measured gain of a baseband gain amplifier of the ZIF transceiver. The gain control logic may further include a gain adjust limiter that limits change of a gain adjust signal during operation based on a maximum limit or on one or more gain change limits. A second lookup table stores a plurality of DC adjust values, which are added during operation to further reduce DC offset. The calibration procedure includes sampling an output signal for each gain step of the baseband amplifier at two predetermined range values and corresponding DC offsets using successive approximation. The data is used to calculate gain, DC offset and DC differential values, which are used to determine the conversion values programmed into the lookup tables or the gain adjust limiter.

A method transmits a video over a network as a bit stream of packets. Real-time feedback information on conditions of the network is received while transmitting the packets. A probability of packet loss is based on the real-time feedback. Then, redundant packets are generated for selected packets of the bit stream if the probability of packet loss is greater than a predetermined threshold.

Improved decision feedback equalizer and decision directed timing recovery systems and methods suitable for use in connection with a dual mode QAM/VSB receiver system are disclosed. A trellis decoder operates in conjunction with a decision feedback equalizer circuit on trellis coded 8-VSB modulated signals. The trellis decoder includes a 4-state traceback memory circuit outputting a maximum likelihood decision as well as a number of intermediate decisions based upon the maximum likelihood sequence path. Any number of decisions, along the sequence, may be provided as an input signal to timing recovery system loops, with the particular decision along the sequence chosen on the basis of its delay through the trellis decoder. Variable delay circuitry is coupled to the other input of the timing recovery system loops in order to ensure that both input signals bear the same timestamp. Final decisions are output from the trellis decoder to a DFE in order to enhance the DFE's ability to operate in low SNR environments. A decision sequence estimation error signal is also generated and used to drive the tap updates of both the DFE and an FFE portion of the equalizer.

A method and apparatus for generating checksum values for data segments retrieved from a data storage device for transfer into a buffer memory, is provided. A checksum list is maintained to contain checksum values, wherein the checksum list includes a plurality of entries corresponding to the data segments stored in the buffer memory, each entry for storing a checksum value for a corresponding data segment stored in the buffer memory. For each data segment retrieved from the storage device: a checksum value is calculated for that data segment using a checksum circuit; an entry in the checksum list corresponding to that data segment is selected; the checksum value is stored in the selected entry in the checksum list; and that data segment is stored in the buffer memory. Preferably, the checksum circuit calculates the checksum for each data segment as that data segment is transferred into the buffer memory.

A system and method for automatically steering a vehicle along an intended path is provided. The system is architecturally partitioned. The partitioned design allows each of the system elements to be designed and maintained independently while allowing variation and flexibility in system configuration. An embodiment of the system elements may comprise a local navigation guidance unit, an external positioning system, a steering controller, and an installation and service computer. Additional elements of an embodiment of the system may comprise a steering position sensor, and at least one steering actuator. The system allows the operator to enter an intended target path and certain vehicle parameters. The local navigation guidance unit receives positional data from an external positioning system, preferably DGPS, indicative of a navigational path traversed by the vehicle. The guidance unit compares the positional data with the intended target path to obtain guidance error and transmits the guidance error to the steering controller. The system allows for determination of the current steering angle and generation of a steering angle adjustment based upon the intended target, the navigational path traversed by the vehicle, the vehicle parameters, the steering angle and the guidance error. The steering angle adjustment is used to actuate a steering mechanism to smoothly guide the vehicle along the intended target path.

A step-down switching voltage regulator includes M high-side switches connected between an input voltage and a node; N synchronous rectifiers connected between the node Vx and a ground voltage and an inductor connected between an input voltage and a node Vx and an inductor connected between the node Vx and an output node. An interface circuit decodes a control signal to identify: 1) a subset (m) of the high-side switches, 2) a subset (n) of the synchronous rectifiers. A control circuit drives the high-side switches and synchronous rectifiers in a repeating sequence that includes an inductor charging phase where the high-side switches in the subset m are activated to connect the node Vx to the input voltage; and an inductor discharging phase where the synchronous rectifiers in the subset n are activated to connect the node Vx to the ground voltage.

The present invention provides methods, systems, and computer program instructions for providing location-independent packet routing and secure access in a wireless networking environment (such as that encountered within a building), enabling client devices to travel seamlessly within the environment. Each client device uses a constant address. An address translation process that is transparent to the client and server is automatically performed as the device roams through the environment, enabling efficient client migration from one supporting access point to another. The secure access techniques provide user-centric authentication and allow policy-driven packet filtering, while taking advantage of encryption capabilities that are built in to the hardware at each endpoint.

A method is described for scheduling the remote starting of an engine of a vehicle. The vehicle includes a remote starting device and a controller coupled to a communication device and to the remote starting device. The remote starting device is responsive to commands from the controller. The method includes a first step of defining a schedule of starting times. A next step includes entering the schedule in the controller. A next step includes controlling an operation of the remote starting device in accordance with the schedule.

A replacement method is provided for replacing a to-be-replaced battery module with a replacing fresh battery module in a battery assembly formed by electrically connecting a plurality of battery modules in series or parallel. The method includes the step (S110) of charging the fresh battery module so that the quantity of charged electricity of the fresh battery module is 5 to 20% less than the quantity of charged electricity of a battery module other than the to-be-replaced battery module, and the step (S120) of replacing the to-be-replaced battery module with the charged fresh battery module.

A modified JAVA(™) execution environment is described. The modified environment supports multiple JAVA(™) applications on a single JAVA(™) virtual machine (JVM). This modified environment provides significant memory and performance improvements when running multiple applications on a single computer system. Notably, no changes are needed to the source code of an application to take advantage of the modified environment. Further, embodiments of the invention may support shared access to base classes through the use of overlays. Additionally, system resource permissions can be enforced based upon the user permissions associated with a running application. Notably, embodiments of the invention allow multiple applications to share the abstract window toolkit (AWT) on a per display basis. Since only a single garbage collection routine is necessary, applications see improved performance relative to running in different JVMs. Further, the shared base classes eliminate significant memory overhead.

Dynamic run-time verification of a module which is loaded in memory (in whole or in part) for execution is enabled by using pre-computed portion-level verification data for portions of the module smaller than the whole (e.g. at the page-level). A portion of the module as loaded into memory for execution can be verified. Pre-computed portion-level verification data is retrieved from storage and used to verify the loaded portions of the executable. Verification data may be, for example, a digitally signed hash of the portion. Where the operating system loader has modified the portion for execution, the modifications are reversed, removing any changes performed by the operating system. If the portion has not been tampered, this will return the portion to its original pre-loaded state. This version is then used to determine validity using the pre-computed portion-level verification. Additionally, during execution of the module, new portions/pages of the module which are loaded can be verified to ensure that they have not been changed, and a list of hot pages of the module can be made, including pages to be continually reverified, in order to ensure that no malicious changes have been made in the module.

The present invention facilitates processor speed adjustments within acceptable temperature ranges. In one embodiment, a present invention system includes a temperature sensor that senses the temperature of the processor. When the temperature sensor senses the processor temperature approaching predetermined levels one or more adjustments are performed. For example, the adjustment can include automatically increasing or decreasing a voltage level in response to crossing a temperature threshold.

A data transfer system comprising a first bus interface, a second bus interface, a first-in-first-out memory, a controller and a message unit. The message unit is operable to queue a plurality of data transfer request messages from the first bus interface and the second bus interface. The controller is operable to process each data transfer request message and transfer data between the first bus interface, the first-in-first-out memory and the second bus interface. The controller is configured to calculate error detection codes (EDCs) and chain EDC values.