Patent application number | Description | Published |
20080267630 | ORTHOGONAL FREQUENCY DIVISION MULTIPLE ACCESS (OFDMA) BASED PASSIVE OPTICAL NETWORK (PON) ARCHITECTURE AND ITS EXTENSION TO LONG DISTANCE - A passive optical network (PON) device, system and method include an optical line terminal (OLT) receiver configured to receive multiple signals at different wavelengths simultaneously and enable multiple transmitters to operate at the same time during one upstream time slot. The optical line terminal employs Orthogonal Frequency Division Multiple Access (OFDMA) to transparently support a plurality of applications and enable dynamic bandwidth allocation among these applications where the bandwidth is allocated in two dimensional frequency and time space. | 10-30-2008 |
20100196009 | POLARIZATION INDEPENDENT FREQUENCY DOMAIN EQUALIZATION (FDE) FOR CHROMATIC DISPERSION (CD) COMPENSATION IN POLMUX COHERENT SYSTEMS - A method for the polarization independent frequency domain equalization (FDE) chromatic dispersion compensation on polarization multiplexing (POLMUX) coherent systems. Operationally, time domain signals are converted to frequency domain signals such that time domain convolution can be done as simple multiplications in the frequency domain. These frequency domain signals then converted back to time domain for subsequent use. The input signal size and FFT size are advantageously designed so that the output signals can be continuous with some overlap between two successive frames. | 08-05-2010 |
20110304369 | METHOD FOR SOURCE SYNCHRONOUS HIGH-SPEED SIGNAL SYNCHRONIZATION - A source synchronous signal synchronization system includes a differential signal receiver; a tunable input delay element coupled to the receiver; an input serializer/deserializer (ISerDes) coupled to the tunable input delay; an alignment unit coupled to the ISerDes; and a delay control unit coupled to the tunable input delay, the ISerDes, and the alignment unit. | 12-15-2011 |
20110310998 | SYSTEMS AND METHODS FOR PERFORMING PARALLEL DIGITAL PHASE-LOCKED-LOOP - A parallel phase locked loop (PLL) system includes a first chain of a plurality of pre-locking PLLs that operates from a free-run state to a locked state; and a second chain of a plurality of PLLs to work from the locked-state to recover signal output. | 12-22-2011 |
20120082457 | K-Means Clustered Polyphase Filtering for Sample Rate Conversion in Coherent Polarization Multiplexing Fiber Optic Systems - A method for clustered polyphase filtering input data converted from an optical signal converting input data from a serial form into a parallel form, permutating data symbols from the input data to form K clusters, passing the permutated data to an adder and multiplier for each cluster; and adding output of all K multipliers together to form an output. | 04-05-2012 |
20120114341 | SYSTEM AND METHOD FOR FREQUENCY-DOMAIN CHROMATIC DISPERSION AND POLARIZATION MODE DISPERSION COMPENSATION WITH TIME-DOMAIN CHANNEL ESTIMATION - A system and method are disclosed which compensate for chromatic dispersion and polarization mode dispersion in a digital signal. The signal is adjusted for chromatic dispersion in the frequency-domain. The signal is then converted to the time-domain and at least a portion of the signal is estimated to produce channel parameters. The channel parameters are converted to the frequency domain and used to compensate for polarization mode dispersion in the signal. | 05-10-2012 |
20120257897 | Energy Efficient OFDM Transceiver - An energy efficient OFDM transceiver includes a transmitter using a decision processor to control first internal elements that can be operated in parallel and can be selectively powered off or hibernated, and a receiver using a processing decision element to control second internal elements that can be operated in parallel and can be selectively powered off or hibernated, wherein control of the first and second internal elements enables tracking status of network traffic, adjustment of OFDM bandwidth based on a traffic decision and selectively powering off or hibernating parallel ones of the first and second internal elements. | 10-11-2012 |
20130084063 | HITLESS PROTECTION FOR TRAFFIC RECEIVED FROM 1+1 PROTECTING LINE CARDS IN HIGH-SPEED SWITCHING SYSTEMS - A communication system includes a synchronous interface coupled to a switch fabric; cells for switching; and a 1+1 protection unit with a primary and back-up line cards. | 04-04-2013 |
20130089327 | Polarization Switching for Optical Fiber Communications - A method implemented in a transmission apparatus used in an optical fiber communications system for a polarization switched differential quaternary phase-shift keying (DQPSK) signal is disclosed. The method comprises splitting data into two or more data streams, inputting said two or more data streams to 1-bit DQPSK precoders to perform 1-bit DQPSK precoding, and multiplexing inphase outputs of the 1-bit DQPSK precoders to generate a first output; and multiplexing quadrature outputs of the 1-bit DQPSK precoders to generate a second output. Other methods, apparatuses, and systems also are disclosed. | 04-11-2013 |
20130170825 | Solution for Hitless Protection in High-Speed OTN Framer and Front-End - In an optical communication system containing a primary line and backup line card, a method includes providing interfaces for the primary and backup line card, each line card including a transmitter and receiver; and selecting output from the transmitter from either the primary or back up line card including selecting the backup line card when the primary line card encounters a failure. | 07-04-2013 |
20140301733 | ELASTIC CLIENT INTERFACE FOR TUNABLE OPTICAL TRANSPONDER - There are provided an optical transponder having a first end and a second end, as well as an electric switch having the transponder. The transponder includes an optical interface, at the first end, having a variable rate optical transmitter and a variable rate optical receiver to respectively transmit and receive signals using at least one of different bandwidths and different bit rates. The transponder further includes an electrical interface, at the second end, having an electrical interface throughput matching an optical capacity of the optical interface. The transponder also includes a processor for controlling the optical capacity. | 10-09-2014 |
20140308037 | Optical Network Switching Using N:N Transponder Through Time-Domain Multiplexing and Burst Mode Access - A network switch is disclosed with each port having the function of: electrical processing and optical modulation; electrical processing has the ability to identify packet or frame destination; burst mode transmission and receiving capability; uses its pre-assigned time slot to send to the corresponding destination, or receive from the expected source. | 10-16-2014 |
20140334814 | Adaptive Optical Amplifier for WDM Systems - An optical amplifier that uses software-defined optical networking (SDON) technology, with a centralized controller and flexible physical hardware (the adaptive amplifier here) to optimize the power distribution among different WDM channels in the amplifier. It considers the detailed information for each channel through the information from centralized controller. It is suitable for both single line rate and mixed line rate system, and is suitable for a wavelength division multiplexing WDM system with the same signal type or different signal types. | 11-13-2014 |
20140365835 | Receiver Bit Alignment for Multi-Lane Asynchronous High-Speed Data Interface - The invention uses a PRBS pattern generated by transmitter (serializer) as training At the receiver side, following receiver outputs, a synchronous capturing module is used to capture multiple lanes simultaneously. The captured data is used to calculate the PRBS distance for different lanes. After the distances are obtained, the one with largest latency is used as a reference, to calculate the relative latency with each other lane. This relative latency is further used to calculate the number of shifts for Barrel Shifter and word shifter. | 12-11-2014 |
20150043927 | Combining I-Q and/or PolMux Optical Receiver to Enable Single Detector - A method for reducing optical components at a receiver which include converting an input signal at a receiver to include an interleaving of alternate signal diversity components, the signal diversity components including phase diversity when the converting includes 0 and 90 degree interleaving and the signal diversity components include polarization diversity interleaving when the converting includes interleaved orthogonal polarizations, and combining the signal diversity components for enabling a single photo detection at the receiver to detect the alternative signal diversity components for subsequent analog-to-digital conversion. | 02-12-2015 |
20150055664 | RECONFIGURABLE AND VARIABLE-RATE SHARED MULTI-TRANSPONDER ARCHITECTURE FOR FLEXIBLE ETHERNET-BASED OPTICAL NETWORKS - Systems and methods for data transport, including receiving one or more signals into a reconfigurable and flexible rate shared rate multi-transponder network architecture, wherein the network architecture includes one or more transponders with multiple line side interfaces and one or more client side interfaces. The transponders are configured to map one or more signals to multiple parallel Virtual Ethernet Links, remove idle characters from the one or more signals, buffer one or more blocks of characters using an intermediate block buffer, activate and deactivate one or more portions of input/output electrical lanes of an Ethernet module, multiplex and demultiplex the one or more signals to and from the input/output electrical lanes to enable sharing of a single optical transceiver by multiple independent signals, and insert blocks of idle characters to enable transmission over a lower rate transmission pipe. | 02-26-2015 |
20150071636 | HITLESS SERVICE IN A VARIABLE RATE OPTICAL TRANSPONDER - Methods and systems for variable rate control include determining a new communications rate in response to measured data traffic patterns. A receive change message is transmitted to a receiver that triggers the receiver to wait for an end of transmission (EoT) message and to set a new communications rate. A transmit change message is transmitted to a transmitter that triggers the transmitter to send the EoT message to the receiver, to set the new communications rate, and to send a start of transmission (SoT) message to the receiver before resuming data communications. | 03-12-2015 |
20150085647 | Eliminating External Buffer for Hitless Protection by Using Channelized Flow Control - A packet switched communication system to support hitless protection includes a packet processor; a traffic manager with a buffer sized to compensate a maximum skew of each hitless path pair of a working path and a protecting path; and a hitless processor positioned between the packet processor and the traffic manager, wherein an interface between hitless processor and traffic manager has flow control to start or stop (XON/XOFF) traffic. | 03-26-2015 |
20150104171 | Burst Switching System Using Optical Cross-Connect as Switch Fabric - A switching system includes one or more line card for input processing, forwarding, queuing, and scheduling data, the line card having a tunable laser to select a wavelength according to the packets' destination for a given burst of packets, so that the burst is switched to a desired destination and sent all-optically to a connected interface; an all-optical switch fabric coupled to the line card to perform wavelength switching; and a centralized arbitrator that resolves the contention from different input ports. | 04-16-2015 |
20150181316 | FLEXIBLE-CLIENT, FLEXIBLE-LINE INTERFACE TRANSPONDER - Methods and systems for flexible-client, flexible-link optical transponders include electrical-to-optical transponders, which accept client data from a flow distributor, and a first multiplexing switch that connects modulated optical carriers from the transponders to line interfaces. The electrical-to-optical transponders each include a flexible optical transport unit (OTU) framer module that compresses multiple optical data units (ODUs) into a single ODU having a higher order than any of the input ODUs to form an optical transport network (OTN) frame. An electrical-to-optical modulator modulates OTN frames onto a carrier. The transponder includes a second multiplexing switch that accepts optical carriers from line interfaces and optical-to-electrical transponders that accept modulated optical carriers from the second multiplexing switch. Each optical-to-electrical transponder includes a photodetector to convert the modulated optical carriers to the electrical domain and a flexible OTU framer module that decompresses received ODUs in OTN frames into multiple ODUs to form a bit stream. | 06-25-2015 |
20150181317 | SCALABLE HYBRID PACKET/CIRCUIT SWITCHING NETWORK ARCHITECTURE - Systems and methods for packet switching in a network, including two or more hybrid packet/circuit switching network architectures configured to connect two or more core level switches in the network architectures, the network architectures being controlled and managed using a centralized software defined network (SDN) control plane. An optical ring network may be configured to interconnect the two or more hybrid network architectures, and one or more hybrid electrical/optical packet/circuit switches configured to perform switching and traffic aggregation. One or more high-speed optical interfaces and one or more low-speed electrical/optical interfaces may be configured to transmit data. | 06-25-2015 |
Patent application number | Description | Published |
20130265994 | Information feedback method and device for uplink closed loop transmission diversity - The present disclosure discloses an information feedback method for uplink closed loop transmission diversity, which includes: a base station allocates each Fractional Dedicated Physical Channel (F-DPCH) to at least one user; and the base station takes at least one F-DPCH as a feedback channel and arranges information of different users in each said F-DPCH by time division multiplexing, wherein information of at least one user in the F-DPCH includes feedback information of the uplink closed loop transmission diversity and an uplink Transmission Power Control (TPC) command. The present disclosure further discloses an information feedback device for uplink closed loop transmission diversity. Through the solution of the present disclosure, information feedback of the uplink closed loop transmission diversity can be implemented, when the information is a weight, the problem of weight feedback of the uplink closed loop transmission diversity is solved, and a user side of a High Speed Uplink Packet Access (HSUPA) system is facilitated to complete an operation of transmission diversity. | 10-10-2013 |
20140219259 | Method, System, Base Station and Terminal for Sending Multipoint Transmission System Data - The present document provides a method, a multi-point transmission system, a base station and a terminal for transmitting data in a multi-point transmission system. The method includes: for a User Equipment (UE) enabling multi-point transmission, a base station to which a secondary serving cell of the UE belongs adjusting a time when a High Speed Shared Control Channel (HS-SCCH) and a High Speed Dedicated Physical Control Channel (HS-PDSCH) are transmitted to the UE according to frame offset information of the primary and secondary serving cells of the UE, so that a subframe boundary offset between the HS-PDSCHs of the primary and secondary serving cells received by the UE is within a specified range, and a subframe boundary offset between the HS-SCCHs of the primary and secondary serving cells received by the UE is within the same specified range. | 08-07-2014 |
20150230272 | Method and apparatus for MTC device accessing wireless communication system - Disclosed are a method and apparatus for MTC device accessing wireless communication system. The method comprises: after the access network element obtaining the limited factor of the queue length, the normal access rank MTC device obtaining the corresponding limited factor of the queue length by monitoring the broadcasting channel; the MTC device calculating the queue length of its buffer, and judging whether the extending access barring EAB process can be performed according to the calculated queue length of its buffer and the obtained limited factor of the queue length; if not, continuing obtaining the corresponding limited factor of the queue length by monitoring the broadcasting channel; if yes, performing the EAB process, and determining whether random access process to the wireless communication system can be initiated according to the performance result of the EAB process. Applying the invention, the overflow of the buffer can be avoided, which is resulted from that the MTC device with large traffic can not access the network. | 08-13-2015 |
Patent application number | Description | Published |
20100207556 | AC/DC CONVERTING CIRCUIT AND MOTOR CONTROLLER USING THE SAME - An AC/DC converting circuit, has a full-bridge rectifier having two input terminals and two output terminals, a first capacitor, a second capacitor, an electronic switch having a control terminal, a trigger circuit having an input terminal and an output terminal, and a detecting circuit having an input terminal and an output terminal. The first capacitor and the second capacitor are serially connected between the output terminals of the full-bridge rectifier, the input terminals of the full-bridge rectifier are connected to an AC input, one end of the electronic switch is connected between the first capacitor and the second capacitor, the other end of the electronic switch is connected to one of the output terminals of the full-bridge rectifier, the input terminal and the output terminal of the detecting circuit are connected to the output terminals of the full-bridge rectifier, the output terminal of the detecting circuit is connected to an input terminal of the trigger circuit, and the output terminal of the trigger circuit is connected to the control terminal of the electronic switch. | 08-19-2010 |
20100208395 | SURGE CURRENT PROTECTION CIRCUIT AND MOTOR USING THE SAME - A surge current protection circuit, has a control unit having an output end, a photoelectric coupling and driving circuit, a silicon symmetrical switch having a control end, and a current-limiting resistor. The current-limiting resistor and the silicon symmetrical switch are parallel connected altogether and then serially connected to a load and an AC input, and the control end of the silicon symmetrical switch is connected to the output end of the control unit via the photoelectric coupling and driving circuit. The invention features low production cost, high reliability and improved power efficiency, and is capable of effectively suppressing surge current. | 08-19-2010 |
20100214702 | OVER-CURRENT PROTECTION CIRCUIT AND MOTOR CONTROLLER COMPRISING THE SAME - An over-current protection circuit, has a main transmission circuit including at least a first triode and a first resistor, a trigger circuit including a second triode and a second resistor, and a detecting circuit having an input terminal and an output terminal. One end of the first resistor is connected to one end of a collecting electrode and an emitting electrode of the first triode. The other end of the first resistor is connected to a current output. The other end of the collecting electrode and the emitting electrode of the first triode is connected to a current input. One end of the second resistor is connected to a collecting electrode of the second triode. The other end of the second resistor is connected to the ground. An emitting electrode of the second triode is connected to the current input. The collecting electrode of the second triode is connected to a base electrode of the first triode. The input terminal of the detecting circuit is connected to the current output whereby extracting a detecting signal therefrom. The output terminal of the detecting circuit is connected to a base electrode of the second triode | 08-26-2010 |