65 results about "High performance communication" patented technology

Channel state information (CSI) can be used by a communications system to precondition transmissions between transmitter units and receiver units. In one aspect of the invention, disjoint sub-channel sets are assigned to transmit antennas located at a transmitter unit. Pilot symbols are generated and transmitted on a subset of the disjoint sub-channels. Upon receipt of the transmitted pilot symbols, the receiver units determine the CSI for the disjoint sub-channels that carried pilot symbols. These CSI values are reported to the transmitter unit, which will use these CSI values to generate CSI estimates for the disjoint sub-channels that did not carry pilot symbols. The amount of information necessary to report CSI on the reverse link can be further minimized through compression techniques and resource allocation techniques.

Transmitter and receiver units for use in a communications system and configurable to provide antenna, frequency, or temporal diversity, or a combination thereof, for transmitted signals. The transmitter unit includes a system data processor, one or more modulators, and one or more antennas. The system data processor receives and partitions an input data stream into a number of channel data streams and further processes the channel data streams to generate one or more modulation symbol vector streams. Each modulation symbol vector stream includes a sequence of modulation symbol vectors representative of data in one or more channel data streams. Each modulator receives and modulates a respective modulation symbol vector stream to provide an RF modulated signal, and each antenna receives and transmits a respective RF modulated signal. Each modulator may include an inverse (fast) Fourier transform (IFFT) and a cyclic prefix generator. The IFFT generates time-domain representations of the modulation symbol vectors, and the cyclic prefix generator repeats a portion of the time-domain representation of each modulation symbol vector. The channel data streams are modulated using multi-carrier modulation, e.g., OFDM modulation. Time division multiplexing (TDM) may also be used to increase flexibility.

The present invention includes a high performance communications cable for transmission media that includes core support-separators which define clearance channels to maintain spacing between transmission media or transmission media pairs. The core support-separator can be either interior to a cable jacket or be employed singularly without the benefit of a jacket and extends along the longitudinal length of the communications cable. The core support-separator has a central region that may include flap-tops along the radial edge that are available for partial or complete sealing of the clearance channels during manufacturing operations. The central region may also include a hollow center portion and include various geometric shapes to provide proper spacing between conductors. Each of the defined clearance channels allow for disposal therein of metal conductors and / or optical fibers.

A local area network connected to an infrastructure access device that provides the home LAN with access to voice, data and television services. The infrastructure access device includes a gateway to voice over Internet Protocol services, an interface to a data network for data access, a router to multiplex signals from the gateways and the data network and a Digital Subscriber Line (DSL) transceiver connected to a gateway device in the customer premises. The gateway device includes a DSL transceiver to communicate over the DSL connecting it to the infrastructure access device to provide the home LAN with high performance communications services without the use of POTS. The DSL transceiver may communicate using a switched carrier modulation scheme to conserve power and reduce crosstalk.

The invention discloses a virtual machine communication method based on a shared memory. A communication channel is established between guest virtual machines on a same host machine by management modules arranged in the guest virtual machines, the channel comprises two virtual shared memory circular queues for receiving and sending data and an event channel for sending an event signal. Two sharedmemory circular queues are maintained for each pair of guest virtual machines in a Xen virtual machine monitor, two sides of compunction map local shared memory circular queues into the two queues, and furthermore, a data channel with high bandwidth is realized. A virtual machine discovery module in a privileged virtual machine can maintain an event channel table in the Xen virtual machine monitor for collecting the information of all guest virtual machines on the same host machine; in addition, a copy of the event channel table is locally maintained on each guest virtual machine and is updated in fixed time, thereby providing necessary information for communication. The guest virtual machine acquires the information of a communication channel of a communication destination by querying the event channel table and realizes high-performance communication between virtual machines through the communication channel.

The present invention includes a high performance communications cable exhibiting reduced cross-talk between transmission media that includes one or more core support-separators having various shaped profiles which define a clearance to maintain a spacing between transmission media or transmission media pairs. The core may be formed of a conductive or insulative material to further reduce cross-talk. The central core region may include a hollow opening or duct for blown fiber (ABF). A method of producing this cable introduces a core support-separator as described above into a cable assembly. The specially shaped core support-separator can be either interior to the cable jacket or be employed singularly without the benefit of a jacket and extends along the longitudinal length of the communications cable. Alternatively, with no jacket for cable completion, a portion of the separator wherein a thin layer of material can act as a type of skin for future mechanical protection may exist. The specially shaped core support-separator has a central region that is either solid, partially solid, foamed, with a solid skin over the foam or hollow itself. The cable may include a plurality of shaped sections that extend outward from the central region along the length of the central region. Each of the adjacent specially shaped sections defines a distinct clearance channel that extends along the longitudinal length of the core support-separator. Each of the defined clearance channels allow for disposal therein of conductors and / or optical fibers.

A TDD antenna array S-CDMA system for increasing the capacity and quality of a wireless communications is disclosed. By simultaneous exploiting the spatial and code diversities, high performance communications between a plurality of remote terminals and a base station is achieved without sacrificing system flexibility and robustness. The time-division-duplex mode together with the inherent interference immunity of S-CDMA signals allow the spatial diversity to be exploited using simple and robust beamforming rather than demanding nulling. Measurements from an array of receiving antennas at the base station are utilized to estimate spatial signatures, timing offsets, transmission powers and other propagation parameters associated with a plurality of S-CDMA terminals. Such information is then used for system synchronization, downlink beamforming, as well as handoff management. In an examplary embodiment, the aforementioned processing is accomplished with minimum computations, thereby allowing the disclosed system to be applicable to a rapidly varying environment. Among many other inherent benefits of the present invention are large capacity and power efficiency, strong interference / fading resistance, robustness power control, and easy hand-off.

The present invention includes a high performance communications cable exhibiting reduced cross-talk between transmission media that includes one or more core support separators (122) having various shaped profiles which define a clearance to maintain a spacing between transmission media or transmission media pairs. The core may be formed of a conductive or insulative material to further reduce cross-talk. The central core region may include a hollow opening or duct for blown fiber (ABF). The specially shaped core support-separator can be either interior to the cable jacket or be employed singularly without the benefit of a jacket, then a portion of the separator wherein a thin layer of material can act as a type of skin for future mechanical protection may exist. The cable may include a plurality of shaped sections that extend outward from the central region and that define distinct clearance channels for disposal therein of conductors and / or optical fibers.

A circuit comprising a plurality of components sharing at least one shared resource, and a lottery manager. The lottery manager is adapted to receive request for ownership for the at least one shared resource from a subset of the plurality of components. Each of the subset of the plurality of components are assigned lottery tickets. The lottery manager is adapted to probabilistically choose one component from the subset of the plurality of components for assigning the at least one shared resource. The probabilistic choosing is weighted based on a number of lottery tickets being assigned to each of the subset of the plurality of components.

The present invention includes a high performance communications cable exhibiting reduced cross-talk between transmission media that includes one or more core support-separators having various shaped profiles which define a clearance to maintain a spacing between transmission media or transmission media pairs. The core may be formed of a conductive or insulative material. A method of producing this cable introduce core support-separators as described above into the cable assembly. The specially shaped core support-separator can be either interior to the cable jacket or be employed singularly without the benefit of a jacket and extends along the longitudinal length of the communications cable. Alternatively, with no jacket for cable completion, a portion of the separator wherein a thin layer of material can act as a type of skin for future mechanical protection is provided. The specially shaped core support-separator has a central region that is either solid or partially solid. The cable may include a plurality of shaped sections that extend outward from the central region along the length of the central region. The specially shaped sections of the core support-separator may be helixed as the core extends along the length of the communications cable. Each of the adjacent specially shaped sections defines a distinct clearance channel that extends along the longitudinal length of the core support-separator. Each of the defined clearance channels allow for disposal therein of conductors and / or optical fibers.

The invention discloses a broadband foldable reflective array antenna, and belongs to the technical field of antennas. The broadband foldable reflective array antenna employs a foldable reflective array antenna structure, and provides a brand new reflective array unit, so that the foldable reflective array of the reflective array unit solves the problem that breakthrough on gain bandwidth of a conventional foldable reflective array antenna is hard to achieve. The characteristics of high gain, low loss, compact structure and low cross polarization of a foldable reflective array antenna are fully explored. The broadband foldable reflective array antenna is suitable for microwave, millimeter wave, THz frequency ranges and applicable to high performance communication or radar systems.

A selectable compatibility electrical connector assembly for use in a high performance communication connection has a plug and a jack which mate together in the high performance mode. The plug has a printed wiring board (PWB) therein which is movable in longitudinal translation. The PWB has, on a surface thereof printed circuitry for altering the electrical characteristics and a plurality of conductive leads in contact with the surface. The PWB has a first position where the leads are in contact with the circuitry and a second position where they contact no circuitry. The jack has members therein which engage the PWB and move it from the first position to the second position when the plug is inserted into the jack, and which return the PWB to the first position when the plug is removed from the jack.

The invention discloses a longitudinal differential protection method based on the synchronous sampling point vector compensation principle, which is characterized by comprising the following steps: calculating the current compensation coefficient * of the current side in real time and calculating the differential current and the braking current of the current side according to the following formulas when the synchronous calculation condition is met under the condition that the normal communication channel is normal: Id is equal to the absolute value of the difference of *1 and **2, and Ir isequal to the absolute value of the sum of *1 and **2, and carrying out the differential calculation with the traditional differential protection calculation method. The longitudinal differential protection method based on the synchronous sampling point vector compensation principle overcome the defect that the dependence of the longitudinal protection in a digital station on a GPS clock, a high-precision clock or a high-performance communication channel and ensures the safe and reliable running of the longitudinal protection.

In a communication method such as IEEE 802.11a that uses a short training sequence, a wireless receiver must complete AGC, synchronization establishment and the like in the short training sequence period, and perform AFC is the remaining short training sequence period. With the present invention, a wireless transmitter varies the length of the training sequence in accordance with a factor such as a communication frame or a transmission destination. For instance, when a transmission rate is greater than a predetermined threshold value, a training sequence that includes a greater number of training symbols than a predetermined number is transmitted. The wireless receiver is able to allocate the training sequence that is longer than normal to AGC, synchronization establishment and the like, and therefore high performance communication can be realized.

The invention provides a broadband coded folded reflectarray antenna based on subwavelength single-layer reflecting units, and solves the problems that the folded reflectarray antenna is narrow in bandwidth and high in design complexity. According to the antenna in the invention, a polarized grid plate and a main array surface equal in area are vertically installed at equal interval; a feed sourceis installed in the geometrical centre of the main array surface; the main array surface in the invention is composed of two subwavelength single-layer reflecting units having 180 DEG phase difference and the same structure by periodic coded arrangement according to a classical reflection array phase theory; in the two reflecting units having the 180 DEG phase difference in the invention, one reflecting unit is the 0 reflecting unit; the other reflecting unit is the 1 reflecting unit, which is formed by counterclockwise rotation of the 0 reflecting unit in 90 DEG; the folded reflectarray antenna in the invention has the high-gain pencil beam; the design difficulty of the antenna array is reduced; the bandwidth is wide; the design complexity is low; the advantages of high gain, low loss, compact structure, low cross polarization and the like of the folded reflectarray antenna are sufficiently played; and the antenna can be applied to a high-performance communication or radar system.

The invention provides an SSL (Secure Sockets Layer) nonblocking communication method and a server therefor / The SSL nonblocking communication method comprises the following steps of: monitoring a network I / O (Input / Output) event by a server, and registering a read event if the I / O event is a connecting event; if the I / O event is a write event, executing write operation of writing second enciphered data in a buffering region into a network, obtaining a current handshake state according to a preset SSL handshake process and executing corresponding operation according to different handshake states; and if the I / O event is a read event, executing read operation of first enciphered data from the network, writing the first enciphered data into a preset buffering region, obtaining the current handshake state according to the preset SSL handshake process and executing corresponding operation according to different handshake states. According to the SSL nonblocking communication method and the server therefor disclosed by the invention, nonblocking high-performance communication of an SSL protocol can be ensured, the handshake interaction process of the whole SSL protocol can be controlled, related messages in the handshake interaction process are controlled easily, and a plurality of problems oriented to SSL protocol application are solved.

The invention discloses an a-axis oriented reinforced type AlN film and a preparation method thereof, and belongs to the technical field of electronic information functional materials and elements. The preparation method includes the steps that an n-type Si(100) substrate is adopted and put into a magnetron sputtering system cavity to be subjected to vacuumizing treatment, different magnetron sputtering processes and annealing treatment are combined, an a-axis oriented AlN buffering layer is prepared firstly, and the AlN film is grown on the basis of the a-axis oriented AlN buffering layer in a preferred orientation mode; as the lattice matching degree of the AlN film and the AlN buffering layer is high, the growth quality of the AlN film is improved, the surface roughness of the AlN film is lowered, the piezoelectric effect of the AlN film is improved, and transmission loss of acoustic surface waves is lowered. The preparation method is easy to operate and implement in the preparing process, is environmentally friendly and saves energy, the raw materials are in abundant supply and low in price, the batch production process is controllable, batch production, application and popularization are facilitated, and the a-axis oriented reinforced type AlN film is suitable for manufacturing high-performance communication elements in the modern communication technology.

A system for automatically transforming a given synchronous circuit description into an equivalent and provably correct desynchronized circuit description. Included in the automated transformation are techniques for synthesizing a variability-aware controller using a two-phase protocol, techniques for synthesizing a variability-aware controller using gated clocks and testability circuits, techniques for synthesizing a variability-aware controller optimized for performance, techniques for initializing the synthesized controller, techniques for dynamically minimizing power requirements, and techniques for interfacing the desynchronized circuit with external synchronous circuits. Also disclosed are techniques for implementing a system for automatically transforming a synchronous circuit description into an equivalent and provably correct desynchronized circuit description within the context of an electronic design automation design flow. Exemplary circuits used in the application of the aforementioned techniques are provided. Application of mathematical models and techniques used for proving equivalence between the input description and the resulting desynchronized circuit are presented and explained.

The present invention provides a transfer method and system for a peer-to-peer overlay network. The transfer method for the peer-to-peer overlay network is used for searching for a relay node between a source host node and a target host node in the peer-to-peer overlay network which comprises multiple host nodes and a bootstrap server. The transfer method comprises the following steps: acquiring coordinates information by the communication between the host node and the bootstrap servers, wherein the coordinates information is used for calculating the time delay between two host nodes based on a distance prediction mechanism; performing host node clustering to make a part of the host nodes as clustering agent nodes and the other host nodes as the host nodes belonging to the clustering agent nodes; selecting, from the clustering agent nodes, the relay node between the source host node and the target host node based on the distance prediction mechanism. With the transfer method and system for the peer-to-peer overlay network of the present invention, effective relay node can be found rapidly in the peer-to-peer overlay network, so that a substitute route with shorter time delay, higher efficiency and stronger stability is established, and high performance communication of peer-to-peer is realized.

The invention provides a high-medium single-layer miniature ceramic capacitor substrate material. Raw materials comprise main ingredients and doping agents. Chemical components of the main ingredients are SrTiO3. The doping agents are composed of, by mass, mwt% of Nb2O5, nwt% of SiO2, pwt% of Y2O3, qwt% of CaSnO3 and rwt% of composite oxide additives. The preparation method includes batching, ball-milling, drying, pelleting, forming, glue discharging, reduction atmosphere sintering and oxidation heat treatment. No Pb, Cd or other volatile or heavy metal elements are contained in the formula of the high-medium single-layer miniature ceramic capacitor substrate material, and the high-medium single-layer miniature ceramic capacitor substrate material is an environment-friendly and pollution-free medium ceramic material. The sintering temperature of ceramic is 1340-1400 DEG C, the dielectric constant is high, and a certain energy-saving advantage is achieved; the raw materials are sufficiently supplied at home, price is low, and the high-medium single-layer miniature ceramic capacitor substrate material is suitable for manufacturing high-performance communication components in the modern communication technology.

The invention relates to an ac coupling method to eliminate dc mistuning with a high-pass filter with multiple corner frequencies in wireless receive system. Wherein, for proper time point, switching the corner frequency of said filter from high to low to eliminate the dc component in signal. This invention cuts time consumption greatly, and satisfies well the standard in high-performance communication system.

The invention discloses a method, system and equipment for realizing high performance communication among modules and a memory medium and relates to the technical field of the communication between the modules. The method comprises the steps of defining that a protocol header of a communication protocol comprises field information such as a charset, protocol body length, a protocol body data type,a sender, a receiver, protocol body MD5 check length, protocol body MD5 value, sending time and an advanced encryption standard; defining that the protocol body of the communication body comprises two parts of a data type and data content, wherein the data type corresponds to the protocol body data type, the data content is presented in a form of a key value pair, and a single-byte key value pairidentifier is added before each key value pair and after the last key value pair; and carrying out data communication among the modules according to the defined communication protocol when the communication needs to be carried out among the modules. According to the method, the system, the equipment and the memory medium, transmission efficiency among the modules is high, a demand for transmitting messages among various modules can be satisfied, and high performance communication can be achieved.

A high speed data communication cable used on network is prepared as forming cable by four pairs of cable lines as each cable line pair being prepared by twisting two pieces of cable lines and being covered with insulation protective sheath then twisting four pairs together in certain sequence, forming each signal line by conductor cable core and insulation cover using copper covered steel as conductor cable core, applying CMP Teflon as material to prepare insulation protective sheath and insulation cover.