Patent application number | Description | Published |
20120076507 | SINGLE PIN COHERENT RECEIVER - In a coherent optical receiver of an optical communications system, methods and systems for receiving a data signal x(t) modulated on an optical signal. A linearly polarized LO light is generated, which has a frequency of f | 03-29-2012 |
20130089341 | MINIMUM VARIANCE CARRIER RECOVERY - Accordingly, an aspect of the present invention provides a method of data symbol recovery. A respective probabilistic phase error is calculated for each of a plurality of data symbol estimates. A phase rotation is calculated based on the probabilistic phase error estimates, using a filter function, and the phase rotation applied to at least one data symbol estimate to generate a corresponding rotated symbol estimate. Each rotated symbol estimate is processed to generate corresponding decision values of each data symbol. | 04-11-2013 |
20130089342 | MINIMUM VARIANCE CARRIER RECOVERY WITH INCREASED PHASE NOISE TOLERANCE - A method of data symbol recovery. An optical signal is modulated by a transmitter using a modulation scheme comprising a symbol constellation having a predetermined asymmetry and detected at a receiver. Phase error estimates corresponding to data symbol estimates detected from the received optical signal are calculated. A phase rotation is calculated based on the phase error estimates, using a filter function, and the phase rotation applied to at least one data symbol estimate to generate a corresponding rotated symbol estimate. The phase error estimates model the asymmetry of the symbol constellation, such that the computed phase rotation can compensate phase noise that is greater than one decision region of the symbol constellation. | 04-11-2013 |
20130209089 | CONSTRAINED CONTINUOUS PHASE MODULATION AND DEMODULATION IN AN OPTICAL COMMUNICATIONS SYSTEM - A transmitter in an optical communications system includes a digital signal processor for processing a data signal to generate a sample stream encoding successive symbols in accordance with a constrained phase modulation scheme having a constellation of at least two symbols and a modulation phase constrained to a phase range spanning less than 4π. A digital-to-analog converter converts the sample stream into a corresponding analog drive signal. A finite range phase modulator modulates a phase of a continuous wavelength channel light in accordance with the analog drive signal, to generate a modulated channel light for transmission through the optical communications system. A receiver in the optical communications system includes an optical stage for detecting phase and amplitude of the modulated channel light and for generating a corresponding sample stream, and a digital signal processor for processing the sample stream to estimate each successive symbol of the modulated channel light. | 08-15-2013 |
20140169793 | FREQUENCY DOMAIN MULTIPLEX OPTICAL TRANSMISSION - A method of transmitting a data signal in an optical communications system. The method includes processing the data signal to generate an analog drive signal, wherein the processing comprises applying a first non-linear operation such that frequency components of the drive signal lay in at least two separated spectral bands. An optical carrier light is modulated using the analog drive signal. | 06-19-2014 |
20140369680 | VARIABLE SPECTRAL EFFICIENCY OPTICAL MODULATION SCHEMES - A method of transmitting a data signal using an optical transmitter of an optical communications system. A first encoder processes an N-bit input vector in accordance with a first mapping to generate a corresponding M-bit data stream. A Forward Error Correction encoder processes the M-bit data stream in accordance with a predetermined FEC encoding scheme to generate an encoded signal. A constellation mapper maps the encoded signal to symbol values in accordance with a predetermined modulation scheme to generate a corresponding symbol stream. A modulator modulates a carrier light in accordance with the encoded symbol stream to generate an optical signal for transmission through the optical communications system. The first mapping can be adjusted to maximize performance of the optical communications system. | 12-18-2014 |
20150033092 | CHAIN ENCODING AND DECODING OF HIGH SPEED SIGNALS - A method of recovering a value of a symbol received through an optical communications system. A multi-bit estimate of the symbol is subdivided into a first part and a second part, each part including at least one respective bit of the estimate. A most likely value of the first part is detected. The most likely value of the first part is processed using a Forward Error Correction (FEC) decoder to generate a corrected first part value, which is used to detect a most likely value of the second part. The most likely value of the second part is then processed by the FEC decoder to generate a corrected second part, which is combined with the corrected first part to recover the value of the symbol. | 01-29-2015 |
Patent application number | Description | Published |
20150021998 | STABILIZED POWER GENERATION - Stabilized power generation apparatus and techniques are disclosed. A stabilized power generator includes a power generating component, an energy store, a bi-directional Direct Current (DC)/DC converter, and a bi-directional DC/Alternating Current (AC) converter. The bi-directional DC/DC converter is electrically coupled between the power generating component and the energy store. The bi-directional DC/AC converter is electrically coupled at a DC side of the bi-directional DC/AC converter to a circuit path between the power generating component and the bi-directional DC/DC converter, and is to be electrically coupled at an AC side of the bi-directional DC/AC converter to an electrical grid. Distributed storage is thereby provided at each power generator, and the converters are controllable to provide MPP tracking in PV systems, power smoothing, and/or maintenance of State of Charge (SoC) of the energy store. | 01-22-2015 |
20150109827 | Dual Active Bridge With Flyback Mode - A dual active bridge (DAB) converter operates in a power conversion operation by controlling multiple bridge configured switches to charge a magnetisation inductance from an input supply during a charge phase of a power cycle and to discharge the magnetisation inductance into an output of the DAB during a discharge phase of the power cycle. The DAB converter includes an input converter connected to the input supply, an inductance connected to the input converter, a transformer comprising a primary and a secondary winding, and an output converter connected to the transformer. The input and output converters each include a first pair of switches forming a first circuit path, and a second pair of switches forming a second circuit path parallel to the first circuit path. The first and second circuit paths are both completed by a third circuit path including the inductance and the primary winding of the transformer. | 04-23-2015 |
Patent application number | Description | Published |
20130343272 | WIRELESS COMMUNICATION SYSTEM WITH CHANNEL-QUALITY INDICATOR MECHANISM AND METHOD OF OPERATION THEREOF - A wireless communication system includes: a filter configured to monitor a behavior of a channel-quality indicator response; and a base station behavior matrix, coupled to the filter, configured to select an ACK channel-quality indicator to be transmitted. | 12-26-2013 |
20140064120 | WIRELESS COMMUNICATION SYSTEM WITH RATE SELECTION MECHANISM AND METHOD OF OPERATION THEREOF - A wireless communication system includes: a control module configured to calculate a maximum throughput to represent a spectral efficiency; a storage module, coupled to the control module, configured to store the maximum throughput in a throughput table; and a communication module, coupled to the control module, configured to transmit a channel quality indicator as a feedback, selected from the throughput table, based on a largest value of the maximum throughput. | 03-06-2014 |
20140105127 | COMMUNICATION SYSTEM WITH FLEXIBLE REPEAT-RESPONSE MECHANISM AND METHOD OF OPERATION THEREOF - A communication system includes: a message communication module configured to communicate a preceding data before a repeat request; a metric module, coupled to the message communication module, configured to determine a repeat metric associated with the repeat request for re-communicating the preceding data or a portion therein; and wherein the message communication module is further configured to communicate a repeat data including a repeat portion based on the repeat metric for re-communicating the preceding data or a portion therein for communicating with a device. | 04-17-2014 |
20140207796 | COMPUTING SYSTEM WITH CORRELATION ESTIMATION MECHANISM AND METHOD OF OPERATION THEREOF - A computing system includes: a sensor configured to receive an input observation including a sample count for processing an original content; and a control unit, coupled to the sensor, configured to: generate a covariance estimate based on the input observation for identifying the original content associated with the input observation for implementing a linear estimation mechanism, and calculate a weight combination based on the covariance estimate for identifying the original content. | 07-24-2014 |
Patent application number | Description | Published |
20100002797 | System and Method for Quantization of Channel State Information - A system and method for quantization of channel state information is provided. A method for operating in a wireless communications system includes estimating a communications channel between a controller and a mobile device, thereby producing a channel estimate, parameterizing the channel estimate with principal angle vectors Θ and Φ, quantizing the principal angle vectors, thereby producing quantized values, and transmitting the quantized values to the controller. | 01-07-2010 |
20100202548 | System and Method for Wireless Communications Using Spatial Multiplexing with Incomplete Channel Information - A system and method for wireless communications using spatial multiplexing with incomplete channel information is provided. A method for wireless communications includes receiving a reference signal from a communications device, computing at least one first beamforming vector from the received reference signal, selecting at least one second beamforming vector from channel statistics, and transmitting information to the communications device. The reference signal is transmitted using a subset of antennas used for data reception at the communications device, and the transmitting uses the at least one first beamforming vector and the at least one second beamforming vector. | 08-12-2010 |
20100246494 | System and Method for Communications Using Spatial Multiplexing with Incomplete Channel Information - A system and method for communications using spatial multiplexing with incomplete channel information are provided. A method for wireless communications includes receiving, at a controller, a reference signal transmitted by a communications device, computing channel statistics based on the received reference signal, computing a first beamforming vector and a second beamforming vector, and transmitting information to the communications device. The reference signal being transmitted using a subset of antennas used for data reception at the communications device, and the controller and the communications device utilize cross-polarized antennas. The computing being based on the channel statistics, the transmitting uses the first beamforming vector and the second beamforming vector, the first beamforming vector precodes information for a first antenna at the communications device, and the second beamforming vector precodes information for a second antenna at the communications device. | 09-30-2010 |
20110115675 | System and Method for Coordinated Spatial Multiplexing Using Second Order Statistical Information - A system and method for coordinated spatial multiplexing using second order statistical information is provided. A method for controller operations includes receiving second order statistics from a plurality of communications devices, computing a beamforming vector for each communications device in the plurality of communications devices, selecting a subset of communications devices from the plurality of communications devices to receive transmissions, and transmitting transmissions to the subset of selected communications devices. The beamforming vector for a communications device is based on the second order statistics provided by the communications device, and the transmitting uses the computed beamforming vector for each selected communications device to transmit the transmissions to the selected communications device. | 05-19-2011 |
20110134978 | System and Method for Non-Uniform Bit Allocation in the Quantization of Channel State Vectors - A system and method for non-uniform bit allocation in the quantization of channel state vectors is provided. A method for communications node operation includes receiving a bit-allocation profile for use in quantizing channel state information, measuring a communications channel between the communications node and a controller, generating channel state information based on the measurement, computing a bit representation of the channel state information, transmitting the bit representation to the controller, and receiving a transmission from the controller. The computing makes use of quasi-tail-biting trellis decoding, and the computing is based on the bit-allocation policy. The transmission makes use of the channel state information transmitted by the communications node. | 06-09-2011 |
20110135020 | System and Method for Quantization of Channel State Vectors - A system and method for the quantization of channel state vectors is provided. A method for communications node operation includes measuring a communications channel between the communications node and a controller, generating channel state information based on the measurement, computing a bit representation of the channel state information, transmitting the bit representation to the controller, and receiving a transmission from the controller. The computing makes use of tail-biting trellis decoding, and the transmission makes use of the channel state information transmitted by the communications node. | 06-09-2011 |
20110286341 | System and Method for Spatial Multiplexing for Coordinated Multi-Point Transmission - A system and method for spatial multiplexing for coordinated multi-point transmission are provided. A method for communications device operations includes receiving transmissions from at least two access points, measuring channels between the communications device and each of the at least two access points based on the received transmissions, computing beamforming weights based on the measured channels, and transmitting the beamforming weights to the at least two access points. The computing is based on attempting to maximize a capacity of a communications system containing the communications device and the at least two access points with the beamforming weights, and the beamforming weights are used at the at least two access points to beamform transmissions to the communications device using coordinated multi-point transmission. | 11-24-2011 |
20130003808 | System and Method for Non-Uniform Bit Allocation in the Quantization of Channel State Vectors - A system and method for non-uniform bit allocation in the quantization of channel state vectors is provided. A method for communications node operation includes receiving a bit-allocation profile for use in quantizing channel state information, measuring a communications channel between the communications node and a controller, generating channel state information based on the measurement, computing a bit representation of the channel state information, transmitting the bit representation to the controller, and receiving a transmission from the controller. The computing makes use of quasi-tail-biting trellis decoding, and the computing is based on the bit-allocation policy. The transmission makes use of the channel state information transmitted by the communications node. | 01-03-2013 |