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Beam division multiple access system and method for mobile communication system
InactiveCN101542937AMultiple accessAvoid interferenceSpatial transmit diversityWireless communicationTime division multiple accessCode division multiple access
The present invention is related to a beam division multiple access system and a method thereof. The base station according to the present invention comprises a initial mobile station information receiver for receiving initial mobile station information that a mobile station omnidirectionally transmits in an initial communication step, a mobile station location and speed detector for detecting a location and a moving speed of the mobile station from the initial mobile station information, a downlink beam generator for generating a downlink beam based on the location and the moving speed of the mobile station transferred from the mobile station location and speed detector, and adjusting at least one of a width and a direction of each the downlink beam, and a downlink beam transmitter for transmitting the downlink beam generated by the downlink beam generator to the mobile station through a phase array antenna.
Owner:KOREA ADVANCED INST OF SCI & TECH
Virtual machine failover
InactiveUS20140164709A1Reduce traffic problemsSmall granularityMemory architecture accessing/allocationMemory adressing/allocation/relocationComputer hardwareMemory address
Disclosed is a computer system (100) comprising a processor unit (110) adapted to run a virtual machine in a first operating mode; a cache (120) accessible to the processor unit, said cache including a cache controller (122); and a memory (140) accessible to the cache controller for storing an image of said virtual machine; wherein the processor unit is adapted to create a log (200) in the memory prior to running the virtual machine in said first operating mode; the cache controller is adapted to transfer a modified cache line from the cache to the memory; and write only the memory address of the transferred modified cache line in the log; and the processor unit is further adapted to update a further image of the virtual machine in a different memory location, e.g. on another computer system, by retrieving the memory addresses stored in the log, retrieve the modified cache lines from the memory addresses and update the further image with said modifications. A computer cluster including such computer systems, a method of managing such a computer cluster and a computer program product are also disclosed.
Owner:IBM CORP
Multi-carrier spread spectrum power line communication system
InactiveCN103179076AImprove stabilityReduce mistakesMulti-frequency code systemsCarrier signalEngineering
The invention provides a multi-carrier spread spectrum power line communication system. Communication equipment in the system comprises a signal transmission device and a signal receiving device; the communication equipment is characterized in that the signal transmission device comprises an encoder, a spread spectrum modulating unit and a carrier modulating unit, which are connected in sequence; the signal receiving device comprises a wavelet filter, a carrier frequency separator, a despreading unit, a data demodulator and a data decoder, which are connected in sequence; when in use, the spread spectrum modulating unit in the signal transmitting device carries out spread spectrum modulation on the data encoded by the encoder, and then the carrier modulating unit carries out multi-carrier modulation on the signal subjected to the spread spectrum in order to meet the orthogonality conditions, and transmits the signal subjected to the spread spectrum to the signal receiving device; the wavelet filter in the signal receiving module carries out wavelet filtering on a received signal, and then the carrier frequency separator carries out frequency separation on each filtered subcarrier, the despreading unit despreads, and the data demodulator demodulates the signal, sequentially, and finally the decoder decodes in order to gain the data.
Owner:GUANGZHOU UNIVERSITY
System and method for maintaining timing of synchronization messages over a reverse link of a CDMA wireless communication system
InactiveUS20050013284A1Minimize overhead transmissionMinimizing start up delaySynchronisation arrangementTime-division multiplexCommunications systemCode division multiple access
A method for operating a subscriber unit that communicates with a code division multiple access (CDMA) wireless network is provided. At the subscriber unit, synchronization information is encoded with a CDMA code. The CDMA encoded synchronization information is transmitted from the subscriber unit in discrete repeating intervals. The discrete repeating intervals are separated by other discrete repeating intervals during which the subscriber unit does not transmit synchronization information.
Owner:APPLE INC
High-speed wavelet multi-carrier spread-spectrum communication system and method suitable for 5G network
ActiveCN103888403AImprove stabilityReduce mistakesMulti-frequency code systemsFourier transform on finite groupsTransformation unit
The invention discloses a high-speed wavelet multi-carrier spread-spectrum communication system and method suitable for a 5G network. The system comprises a plurality of communication devices which are in mutual communication and are arranged in a wireless network. The communication devices comprise the signal emission device and the signal receiving device. The signal emission device comprises a coding unit, a spread-spectrum unit, a carrier modulation unit and a parallel-serial conversion unit which are sequentially connected. The signal receiving device comprises a series-parallel conversion unit, a wavelet filtering unit, a dispreading unit, a data demodulation unit and a decoding unit which are sequentially connected. High adaptability is achieved to a time-frequency selectivity wireless channel. Meanwhile, due to the facts that spreading codes with different lengths are used for corresponding to various wavelet subcarriers with different bandwidths, and the spreading codes with the same length are further arranged, so that multiple choices are achieved, the high-speed wavelet multi-carrier spread-spectrum communication system can obtain more higher data rates than that of a conventional multi-carrier spread-spectrum communication system in which fast Fourier transformation is used, and thus the high-speed wavelet multi-carrier spread-spectrum communication system and method are suitable for the high-speed 5G network.
Owner:GUANGDONG ANHEWEI ELECTRIC POWER CONSTR CO LTD
Method, system and apparatus for signal generation and message transmission in broadband wireless communications
ActiveUS20100254253A1Optimize networkIncrease capacityOrthogonal multiplexPayload allocationTime domainCommunications system
Method for signal generation in broadband wireless communications, comprises: A. modulating, segmenting and serial-parallel converting the signal data to be transmitted, then computing DFT of the serial-parallel converted data so as to transfer them to frequency domain; B. performing block unit modulating processing and block repeat modulating processing on the frequency domain data, then mapping the block units to assigned time-frequency positions; C. computing IFFT of the mapped block units, then adding them to the cycle prefix, thus the random sequences in time domain are generated. Apparatus for signal generation, Method and system for message transmission in broadband wireless communications are also disclosed. The problem of resource allocation and scheduling, and problem of interference coordination and control are solved, the throughput and performance of communication system are greatly improved.
Owner:DATANG MOBILE COMM EQUIP CO LTD
Wide band-DCSK modulation method, transmitting apparatus thereof, wide band-DCSK demodulation method, and receiving apparatus thereof
InactiveUS20060198522A1Reduce manufacturing costReduce power consumption costsCode division multiplexSecuring communication by chaotic signalsEngineeringWide band
Provided are a wide band-differential chaos shift keying modulation method, a transmitting apparatus adopting the wide band-differential chaos shift keying modulation method, a wide band-differential chaos shift keying demodulation method, and a receiving apparatus adopting the wide band-differential chaos shift keying demodulation method. The wide band-differential chaos shift keying modulation method includes: generating a wide band chaotic signal; delaying the wide band chaotic signal; multiplying the delayed wide band chaotic signal by an information signal to output a multiplied signal; and performing a switching operation so as to alternately transmit the wide band chaotic signal and the multiplied signal. Thus, the invention can be realized without an APLL, a mixer, an FM modulator, and the like, to reduce power consumption and manufacturing cost for the transmitting apparatus. Thus, noise characteristics and security performance can be high, and the wide band-DCSK modulation method can be robust to multi-path.
Owner:SAMSUNG ELECTRONICS CO LTD
Contention access method and device
ActiveCN107343322AControl accessMultiple accessWireless communicationAccess methodOrthogonal sequence
Owner:ZTE CORP
Radio base system, transmission directional control method, and transmission directional control program
InactiveUS7565171B2Easy to controlMultiple accessSpatial transmit diversityPolarisation/directional diversityTransmission responseResponse vector
A radio unit (2000) separates a signal from a specific terminal among signals from array antennas (#1-#4) based on a reception weight vector calculated by a reception weight vector calculator (20). A reception response vector calculator (22) derives a reception response vector of a propagation path for the signal from the specific terminal. A transmission response vector estimator (40) regards an estimation result of the reception response vector calculator (22) as a composite waveform of a function of a plurality of frequencies, determined in accordance with a Doppler frequency, and predicts a transmission response vector at a time point of transmission by obtaining coefficients of respective function. A transmission weight vector calculator (30) controls antenna directivity in transmission, based on a prediction result of the transmission response vector estimator (40).
Owner:SANYO ELECTRIC CO LTD +1
Wavelet multi-carrier spread spectrum communication system and method with frequency changing
InactiveCN103763232AImprove stabilityReduce mistakesPhase-modulated carrier systemsMulti-frequency code systemsComputation complexityData demodulation
The invention discloses a wavelet multi-carrier spread spectrum communication system and method with frequency changing. The system comprises a signal transmission device and a signal receiving device. The signal transmission device comprises an encoder, a spread spectrum unit, a carrier modulation unit and a parallel-series conversion unit all of which are connected in sequence; the signal receiving unit comprises a series-parallel conversion unit, a wavelet carrier unit, a dispreading unit, a data demodulation unit and a decoder all of which are connected in sequence. The system carries out wavelet reverse transformation on multi-carrier spread spectrum signals according to channel frequency changing to finish the parallel-series conversion, the system can be answerable for a time-frequency selective channel, and the stability of the system is improved; meanwhile, the fast wavelet transformation is adopted, the system has high adaptation and low calculation complexity.
Owner:深圳市金频科技有限公司
Virtual machines failover
InactiveUS9047221B2Reduce traffic problemsSmall granularityMemory architecture accessing/allocationMemory adressing/allocation/relocationMemory addressComputer cluster
Disclosed is a computer system (100) comprising a processor unit (110) adapted to run a virtual machine in a first operating mode; a cache (120) accessible to the processor unit, said cache including a cache controller (122); and a memory (140) accessible to the cache controller for storing an image of said virtual machine; wherein the processor unit is adapted to create a log (200) in the memory prior to running the virtual machine in said first operating mode; the cache controller is adapted to transfer a modified cache line from the cache to the memory; and write only the memory address of the transferred modified cache line in the log; and the processor unit is further adapted to update a further image of the virtual machine in a different memory location, e.g. on another computer system, by retrieving the memory addresses stored in the log, retrieve the modified cache lines from the memory addresses and update the further image with said modifications. A computer cluster including such computer systems, a method of managing such a computer cluster and a computer program product are also disclosed.
Owner:IBM CORP
Fast acquisition of traffic channels for a highly variable data rate reverse link of a CDMA wireless communication system
InactiveUS6928064B2High data rateMinimize overheadError preventionModulated-carrier systemsCommunications systemCode division multiple access
A method for monitoring idling mode connections between a base station and idling subscriber units that are powered on, but not actively sending data, is provided. The method includes making available a plurality of orthogonal subchannels within at least one Code Division Multiple Access (CDMA) radio frequency (RF) channel. A shared orthogonal subchannel is assigned to at least two different idling subscriber units, but utilizing different time slots of the shared orthogonal subchannels. For each idling subscriber unit assigned the shared orthogonal subchannel, a respective heartbeat signal is sent within its assigned time slot at a data rate that is low enough to maintain bit synchronization with the base station. The respective heartbeat signals are tracked within the assigned time slots by selecting an assigned time slot within the shared orthogonal subchannel, retrieving a previous tracking of a respective heartbeat signal for an idling subscriber unit associated with the assigned time slot, determining a current tracking of the respective heartbeat signal for the idling subscriber unit associated with the assigned time slot, and updating the tracking of the idling subscriber unit associated with the assigned time slot based upon its current and previous trackings.
Owner:INTEL CORP
Carrier frequency error estimation and compensation system and method of multi-carrier spread spectrum communication
ActiveCN103595683AImprove stabilityReduce mistakesMulti-frequency code systemsTelecommunicationsCarrier signal
The invention discloses a carrier frequency error estimation and compensation system and method of multi-carrier spread spectrum communication. A communication device in the system comprises a signal transmitting device and a signal receiving device. The signal receiving device is composed of a carrier frequency separator, a carrier frequency error estimation, compensation and despreading unit, a data demodulator and a decoder, wherein the carrier frequency separator, the carrier frequency error estimation, compensation and dispreading unit, the data demodulator and the decoder are sequentially connected. A spread spectrum modulation unit in the signal transmitting device performs spread spectrum modulation on data which are coded by a coder, the carrier modulation unit performs multi-carrier modulation which meets the orthogonality condition on signals which undergo spread spectrum, and the signals are transmitted to the signal receiving device through a wireless channel. According to the received signals in the signal receiving device, the carrier frequency separator is used sequentially used for performing frequency separating on all received sub-carriers, the sub-carriers undergo carrier frequency error estimation and compensation and are despread by the despreading unit, the signals are demodulated by the data demodulator, and finally the data are obtained by being decoded by the decoder. The carrier frequency error estimation and compensation system and method have high adaptability and low complexity.
Owner:GUANGDONG ANHEWEI ELECTRIC POWER CONSTR CO LTD
Virtual machines failover
InactiveUS20140164701A1Improve performanceMinimize frequencyMemory architecture accessing/allocationMemory adressing/allocation/relocationComputer hardwareMemory address
Disclosed is a computer system (100) comprising a processor unit (110) adapted to run a virtual machine in a first operating mode; a cache (120) accessible to the processor unit, said cache including a cache controller (122); and a memory (140) accessible to the cache controller for storing an image of said virtual machine; wherein the processor unit is adapted to create a log (200) in the memory prior to running the virtual machine in said first operating mode; the cache controller is adapted to transfer a modified cache line from the cache to the memory; and write only the memory address of the transferred modified cache line in the log; and the processor unit is further adapted to update a further image of the virtual machine in a different memory location, e.g. on another computer system, by retrieving the memory addresses stored in the log, retrieve the modified cache lines from the memory addresses and update the further image with said modifications. A computer cluster including such computer systems, a method of managing such a computer cluster and a computer program product are also disclosed.
Owner:IBM CORP
Method and system for accessing storage device
ActiveUS20130110960A1Guaranteed high performance operationMultiple accessDigital computer detailsInput/output processes for data processingControl storeClient-side
In a subrack with multiple boards, in order to enable a server board and at least one client board of the multiple boards to access a same storage device, an embodiment server board acquires, physical information of at least one physical storage device. Then the server board sends a client board the physical information to enable the client board to establish a virtue storage device and receives a first request for accessing the virtual storage device sent from the client board. The server board convertes the first request for accessing the virtual storage device into a second request for accessing the physical storage device, and sends the second request for accessing the physical storage device to a storage controller connected to the physical storage device in order to enable the storage controller to send relevant data to the client.
Owner:HUAWEI TECH CO LTD
System and method for maintaining timing of synchronization messages over a reverse link of a CDMA wireless communication system
InactiveUS7936728B2High data rateMinimize overheadError prevention/detection by using return channelChannel dividing arrangementsCommunications systemSpread factor
A service option overlay for a CDMA wireless communication in which multiple allocatable subchannels are defined on a reverse link by assigning different code phases of a given long pseudonoise (PN) code to each subchannel. The instantaneous bandwidth needs of each on-line subscriber unit are then met by dynamically allocating none, one, or multiple subchannels on an as needed basis for each network layer connection. The system efficiently provides a relatively large number of virtual physical connections between the subscriber units and the base stations on the reverse link for extended idle periods such as when computers connected to the subscriber units are powered on, but not presently actively sending or receiving data. These maintenance subchannels permit the base station and the subscriber units to remain in phase, time and power synchronism while maintaining optimal timing control over synchronization messages. This in turn allows fast acquisition of additional reverse link capacity as needed by allocating additional orthogonal codes within the same code phase and by varying the spreading factor of the codes, as well as by adding additional code phases.
Owner:APPLE INC
Mobile communication base station antenna
InactiveCN101789548AIncrease data communication capacityRealize space division multiple accessIndividually energised antenna arraysPolarised antenna unit combinationsTime division multiple accessSpace-division multiple access
The invention provides a mobile communication base station antenna capable of realizing the spatial subdivision multiple access with no need for greatlu increasing the arrangement area of the present mobile communication base station antenna. The mobile communication base station antenna is formed by two orthogonally arranged antenna elements (3) and has two or more array antennas (2) for arranging a plurality of antenna element pairs (14) in array shape to improve the use efficiency of the frequent and enlarge the channel capacity. The array antennas (2) are arranged with a predetermined distance in a vertical direction.
Owner:HITACHI CABLE
Testing system of optical fiber network
InactiveCN103472388AGood rewritable performanceLarge storage capacityElectrical testingFiber-optic communicationTransceiver
The invention discloses a testing system of an optical fiber network, and belongs to the technical field of optical fiber communication transmission. The testing system comprises a first reference clock chip and a second reference clock chip, and further comprises a central processing unit, an optical transceiver, an FPGA, an EPROM and a JTAG debugger, wherein the first reference clock chip and the second reference clock chip are both connected with the central processing unit, the central processing unit, the EPROM, the JTAG debugger and the optical transceiver are all connected with the FPGA, and the JTAG debugger is connected with the EPROM. By means of the testing system, each module of the FPGA can be tested, configuration programs can be directly written in the EPROM, the engineering period is short, and the development can be conveniently and flexibly realized.
Owner:CHENGDU CHENGDIAN GUANGXIN TECH
Method and apparatus for buttress stabilization
InactiveUS7338025B2The process is simple and fastMultiple accessPortable framesVehicle body stabilisationAutomotive engineeringRolling chassis
A method for stabilizing a roof-resting vehicle includes the steps of leaning one or more buttress stands against a rear fender area of the vehicle, passing a chain under a rear end of the vehicle from one of the buttress stands to another, tightening the slack from the chain by pulling chain-grab end fittings towards the fenders at the vehicle undercarriage, using a ratchet strap, restraining the chain from sliding off the rear end of the vehicle by attaching a ratchet strap to the chain near a trunk lid of the vehicle, and passing the chain up to the vehicle undercarriage in front of a wheel assembly of the vehicle, attaching a ratchet strap at a base of the one or more buttress stands and tightening, and placing wedges in front of the opposite end of the vehicle, such that the vehicle is stabilized.
Owner:RES Q JACK
Wireless receiving and transmitting method and equipment thereof
ActiveCN101594223AImprove transmission efficiencyRealize multiplexingSignal channelsError prevention/detection by diversity receptionMultiplexingSignal-to-noise ratio (imaging)
The invention belongs to the field of wireless communication and discloses a wireless receiving and transmitting method and equipment thereof, which can utilize the same time-frequency source for providing higher channel capacity, wherein multichannel data are loaded in layers with different levels of signal to noise ratios at a transmitting end and received at a receiving end in a mode of serial interference cancellation. The levels of the signal to noise ratios needed by different layers can be realized by controlling the code rate, the modulation mode and the transmitting power magnitude of codes. The data of different layers can belong to different data flows of the same user equipment for realizing multiplexing, can also belong to different user equipment for realizing multiple access and can be acquired by shunting the same data flow. The data needing layered transmission can be firstly randomized.
Owner:SPREADTRUM COMM (SHANGHAI) CO LTD
Internet of things testing method and device
ActiveCN108574947AMultiple accessReduce R&D testing costsNetwork data managementThe InternetComputer terminal
The embodiment of the invention provides an Internet of things testing method and device. The Internet of things testing method comprises the following steps: writing acquired configuration data of avirtual SIM (Subscriber Identity Module) card to be tested into a corresponding blank testing terminal to form a valid testing terminal in order to access Internet of things to be tested; storing theconfiguration data of the virtual SIM card to be tested in the valid testing terminal and networking configuration information in a virtual testing terminal to perform restoration on the blank testingterminal when testing data interaction is performed between the virtual SIM card to be tested and the Internet of things to be tested in order to realize testing data interaction between the valid testing terminal and the Internet of things to be tested, namely, the blank testing terminal only needs to be used by the virtual testing terminal corresponding to the virtual SIM to be tested when testing data interaction is performed between the virtual SIM card to be tested and the Internet of things to be tested. Under other conditions, the corresponding blank testing terminal is in a non-occupied state, so that the blank testing terminal can be used repeatedly. Thus, access of more testing terminals can be realized under the condition of not increasing the hardware cost, and the testing cost is lowered.
Owner:ZTE CORP
Anti-interference communication method and electronic equipment
ActiveCN112235223AImprove anti-interference abilityMultiple accessMulti-frequency code systemsTime domainInterference (communication)
One or more embodiments of the present specification provide an anti-interference communication method and electronic equipment, which can solve the problem of reduced communication quality caused byinter-symbol interference and narrowband interference. The electronic equipment includes a memory, a processor, and a computer program stored on the memory and operable on the processor for performingan anti-interference communication method. The anti-interference communication method comprises the following steps that: a signal sending end allocates an information symbol of initial modulation information to a delay-Doppler domain resource grid to obtain a mixed jump symbol signal, carries out inverse symplectic Fourier transform and Hesenberg transform on the mixed jump symbol signal to obtain a time-domain sending signal, transmits the time-domain sending signal to a communication channel; and a signal receiving end receives the corresponding time-domain receiving signal, carries out Wigner transform and symplectic Fourier transform on the time-domain receiving signal to obtain a receiving signal, performs information symbol sequence detection on the receiving signal, and determinescommunication information sent by the signal sending end.
Owner:BEIJING UNIV OF POSTS & TELECOMM
Beidou high-precision satellite navigation and position service system
ActiveCN113031011ASave resource costMultiple accessSatellite radio beaconingEngineeringUser management
The invention provides a Beidou high-precision satellite navigation and position service system, which comprises a satellite navigation positioning resolving module, a user management platform, a terminal user and an operation state monitoring module, and is characterized in that the satellite navigation positioning resolving module is used for resolving reference station data to obtain regional enhanced data information; the user management platform is used for managing and authenticating a terminal user, selecting a corresponding virtual observed quantity of a certain grid point from the regional enhanced data information as differential information of the user according to information uploaded by the terminal user, and sending the differential information and position coordinates of the grid point to the terminal user; and the running state monitoring module is in data communication with the satellite navigation positioning resolving module and is used for monitoring the running state of the base station and the regional enhanced data information. According to the invention, only a fixed number of grid point virtual reference stations are calculated through the satellite navigation positioning calculation module, the calculation is not related to the number of terminal users, and the consumed resources are fixed, so that the resource cost can be greatly saved.
Owner:交信北斗科技有限公司 +1
Method and system for carrying out terminal comprehensive management service, and switch
Embodiments of the invention disclose a method and a system for carrying out a terminal comprehensive management service, and a switch. The system comprises a resource pool in which a vBRAS with a service processing capability is deployed by applying an NFV (Network Function Virtualization) technology, and an aggregation switch of a data metropolitan area network, wherein the aggregation switch receives the terminal comprehensive management service sent by an HGU, and sends the terminal comprehensive management service to the vBRAS for processing through a VxLAN tunnel. According to the system, an ITMS service on a BRAS can be separated out, and the separated ITMS service is processed by the vBRAS, so that the access of more broadband users can be realized on the BRAS, and the operation cost is reduced.
Owner:CHINA MOBILE GROUP SICHUAN +1
Controlling transmission resources in mobile radio systems with dualtransfer mode
ActiveUS8712423B1Cutting portionSignificant to useNetwork traffic/resource managementConnection managementTransfer modePacket switched
The invention relates to a method for controlling the use of transmission resources, wherein transmission resources for a transmission between a first entity (200) and a second entity (204) can be used by at least a first connection (205) and a second connection (219), comprising checking (208, 211) whether QoS requirements of the first connection (205) can still be guaranteed when the transmission resources are jointly used by the first connection (205) and the second connection (219), and controlling (212) the use of at least one portion of the transmission resources by at least one of the first (205) and second connections (219), accordingly. The connections may for instance be packet-switched (205) and circuit-switched (219) connections in a General Packet Radio System that is capable of Dual Transfer Mode (DTM).
Owner:CONVERSANT WIRELESS LICENSING LTD
Grid-based high-precision satellite navigation and positioning service system
PendingCN113050139ASave resource costMultiple accessSatellite radio beaconingService systemTelecommunications
Owner:交信北斗科技有限公司 +1
Optical network data card capable of being configured by FPGA
InactiveCN103475413AFlexible configurationShort production cycleFibre transmissionFpga field programmable gate arrayTransceiver
The invention discloses an optical network data card capable of being configured by an FPGA. The optical network data card comprises a first reference clock chip and a second reference clock chip, and further comprises a central processor, an optical transceiver, a PCI-Express interface and the FPGA, wherein the first reference clock chip and the second reference clock chip are both connected with the central processor, and the central processor, the PCI-Express interface and the optical transceiver are all connected with the FPGA; the FPGA comprises an FC data processor, a data-caching mechanism, a PCI-Express processor and a working condition register block, the FC data processor, the data-caching mechanism and the PCI-Express processor are all connected with the working condition register block, the FC data processor is connected with the data-caching mechanism, and the data-caching mechanism is connected with the PCI-Express processor. The optical network data card can achieve Gbs-level data transmission, high-precision real-time big data acquisition, and monitoring and simulation operation of an optical network.
Owner:CHENGDU CHENGDIAN GUANGXIN TECH
Novel PLC networking structure and method as well as corresponding novel intelligent electricity meter carrier module
InactiveCN106803341AMultiple accessElectric signal transmission systemsCarrier signalElectricity meter
The invention discloses a novel PLC networking structure. The novel PLC networking structure comprises a concentrator, a concentrator carrier module, at least one novel intelligent electricity meter carrier module and at least one electricity meter network, wherein the concentrator carrier module is a CCO end connected with the concentrator via communication; the at least one novel intelligent electricity meter carrier module is respectively connected with the concentrator carrier module via communication; each novel intelligent electricity meter carrier module comprises an STA unit and a Sub-CCO unit which work in parallel; the at least one electricity meter network is correspondingly connected with each novel intelligent electricity meter carrier module; each electricity meter network comprises a plurality of common intelligent electricity meter single carrier modules and a plurality of intelligent electricity meters; each intelligent electricity meter is connected with each common intelligent electricity meter single carrier module via communication; and each common intelligent electricity meter single carrier module is provided with an STA function. The novel PLC networking structure disclosed by the invention has the advantages that more intelligent electricity meters are accessed by additionally mounting the novel intelligent electricity meter carrier module with the Sub-CCO working mode logic in case of using one CCO end.
Owner:WU QI TECH INC
Transmission system, transmission method, reception system, and reception method
InactiveUS20090034586A1Improve transmission efficiencyMultiple accessSpatial transmit diversityModulated-carrier systemsComputer scienceLow complexity
First normalizing means (12) normalizes first and second code streams (s1, s2). First spreading means (13) spreads the output of the first normalizing means (12). STTD coding means (14) subjects the first and second code streams (s1, S2) to STTD coding. Second normalizing means (15) normalizes the output of the STTD coding means (14). Second spreading means (16) spreads the output of the second normalizing means (15) by means of the same spreading code as that of the first normalizing means (12). Orthogonal transforming means (17) gives the negative signs to odd chips in a second path spread sequence of each code and exchanges the orders of the odd and even chips. Combining means (18) adds first and second spread sequences of the second path produced by orthogonally transforming the first and second spread sequences of the first path. With this, by using the orthogonality of the transmitted sequences at the receiving side, the reception signal can be detected with a lower complexity.
Owner:PANASONIC CORP
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