53 results about "Delay equalization" patented technology

A device for minimizing group delay mismatch in a quadrature receiver (402) having an in-phase channel and a quadrature-phase channel. The device includes a microprocessor (465) for determining an I/Q phase imbalance between digital signals on an in-phase channel and digital signals on a quadrature-phase channel, and for calculating a group delay mismatch between the in-phase channel and the quadrature-phase channel, and a group delay equalizer (426). The group delay equalizer includes a delay line (505 and 605) for delaying one of the in-phase channel and the quadrature-phase channel by one of a plurality of delays, based on an amount of group delay mismatch.

A cable system, and a method for configuring a path of a cable system, wherein the group delay caused by one or more amplifiers having diplex filter networks is substantially equalized over all frequencies within a predetermined band by the use of one or more all-pass delay equalizers. A method of configuring a path includes steps of determining a delay versus frequency characteristic of the path within the predetermined frequency band, and providing from one to a plurality of all-pass delay equalizers in the path, wherein a collective delay versus frequency characteristic of the all-pass delay equalizer(s) within a predetermined frequency band is a mirror image of that caused by the amplifier(s), such that all frequencies within the predetermined frequency band are delayed by substantially the same amount and hence all frequency components of a signal arrive at a receiver at substantially the same time.

This invention refers to analog signal process and communication technology, especially refers to the group delay equalization of high temperature superconductive filter used in high temperature superconductive film technology field, which contains high temperature superconductive microstrip filter, 3db mixing coupler and two single end reflection filter, is a plane microstrip structure and adapts for making phase equalization and reducing phase distortion to the high temperature superconductive filter of RF front end in satellite receiving system and receiving front end in base station of mobile communication system. Said invention is integrated in one medium substrate and has more stable performance.

The invention discloses an automatic optical fiber transmission delay locking and equalization method applicable to optical fiber communication networks. Under the SDH (Synchronous Digital Hierarchy) system of conventional optical fiber transmission devices, by adding a zero-attenuation program-controllable optical fiber delay equalization network, in combination with an on-line optical fiber delay monitoring technique, the method reasonably chooses C mark and a time interval code Txk corresponding to C mark, a round trip comparison phase locking technique is utilized to separate out the change of an optical fiber delay value between a master station and a slave station in order to eliminate the adverse affection of the change of the optical fiber delay value on time and frequency synchronization, a three point-to-one point accurate measurement algorithm is adopted to constantly control the change of the optical fiber delay within an extremely narrow range, and thereby high-precision time and frequency synchronization is realized. The method provided by the invention is applied in combination with the on-line optical fiber delay monitoring technique, and can firmly control the delay change of optical fiber transmission within a range less than or equal to (1ns/day to 2ns/day to 5ns/day to 10ns/day).

A method, a device and a system for delay equalizing of fragment data streams transmitted via N individual paths and forming a virtual data stream, wherein the virtual data stream and each of said fragment data streams consisting of data frames; the method including gradual minimization of differential delay of the fragment data streams at one or more intermediate points between a source point and a destination point of the virtual data stream. The gradual minimization of the differential delay can be provided by devices (30, 32) respectively fitted at the intermediate points; each of the devices comprises a control unit (36) and N memory buffer blocks (34), each associated with a respective individual path.

A delay applied to a turn-on time for a high side switch in a switch mode power converter prevents oscillation between continuous and discontinuous conduction modes under light load conditions. The delay equalizes turn-on time for a high side switch with respect to continuous and discontinuous modes, so that turn-on time is not treated differently between the different modes. The delay value can be set for be equivalent to a propagation delay through a driver for a low side switch, in addition to a turn-off time for the low side switch. The addition of the delay element tends to maintain the switch mode power converter in a discontinuous mode under light load conditions and avoids oscillation between discontinuous and continuous conduction modes.

The invention provides a method for carrying out equalization on a 100M magnitude broadband reception signal, and is aimed at providing a method for using a simple time domain parallel structure to carry out time domain equalization on the broadband signal with small resource consumption, a fast operation speed, and no need of changing a transmission system. The method is realized through the following technical scheme: (1) employing a fraction interval adaptive blind equalization digital logic circuit with decision feedback, and receiving over-sampling baseband signal to be equalized in parallel; (2) carrying out addition of output of all transverse filtering structures as equalization output, and sending the baseband signal to be equalized into the transverse filtering structures in a forward direction equalization unit according to a corresponding phase relationship; (3) judging an equalization output result with a decision unit, and solving an error signal e(n) of the output result and a decision result; after e(n) is adjusted through an error convergence factor, carrying out gradient estimation and equalization coefficient updating, and sending an updated equalization coefficient to each transverse filtering structure to carry out an equalization operation. According to the method, contradiction between generating the equalization results and carrying out the equalization coefficient updating simultaneously in a code element is solved.

The invention provides an automatic delay equalizer and an automatic delay equalization method which can detect a delay characteristic (delay distortion) of an input signal and automatically compensate for the delay characteristic. The equalizer includes an inclination delay equalization section for compensating for the delay characteristic of the input signal in accordance with an inclination delay characteristic, and a control section for discriminating a direction of variation of a value of a first one of a pair of digital demodulated signals of the input signal, detecting error information from a second one of the digital demodulated signals which is orthogonal to the first signal and outputting a control signal for the inclination delay equalization section based on a correlation between the error information and the direction of variation of the value of the first signal.

Disclosed are an equalizer and an equalization method employing an adaptive algorithm for high speed data transmissions. The equalizer includes: a subtraction unit subtracting a feedback signal from an input signal to generate a subtraction signal; a timing signal generation unit generating a sampling timing signal; an equalization signal generation unit equalizing the subtraction signal according to the sampling timing signal to generate an equalization signal; and a feedback signal generation unit calculating a filter coefficient value by using the subtraction signal and the equalization signal, delaying the equalization signal, and weighting the delayed equalization signal according to the filter coefficient value to generate a feedback signal.

The invention provides an energy efficiency optimization and resource allocation method. The method comprises the following steps: calculating a signal-to-interference-noise ratio received by users ofan authorized spectrum in a small base station on a subchannel; calculating a signal-to-interference-noise ratio received by users of an unauthorized spectrum in the small base station on the subchannel; calculating the total capacity of all users in the small base station according to the capacities of the users of the small base station; calculating a utility function; rewriting an equivalent objective function; rewriting an optimization problem according to a defined throughput function and the average throughput of the users; rewriting the optimization problem again according to the arrival of traffic of the users in the small base station; and getting a solution of three sub-problems by means of Lyapunov optimization. The invention also provides an energy efficiency optimization andresource allocation system. Through the technical scheme provided by the invention, the enhancement of utility performance and the balance of energy efficiency delay can be realized under various constraints.

A Z/2Z ladder network includes an R/2R ladder network having capacitors coupled across series resistors within the R/2R ladder network, wherein the capacitors are sized to substantially match delays from nodes within the ladder network to an output node. The Z/2Z ladder network can be implemented within a digital to analog controller (“DAC”), including higher resolution DACs, and high data rate DACs. In higher resolution DACs, and high data rate DACs, the Z/2Z ladder network is coupled through switches to corresponding current sources. The Z/2Z ladder is optionally implemented differentially. The invention can be implemented as a Z/kZ ladder network, where k is a real number.

An in-band group delay equalizer is formed in a simple circuit configuration so as to have a flat group delay characteristic over a wide frequency band without having a peak of group delay near each passband edge. The in-band group delay equalizer includes a plurality of convex group delay circuits. Each convex group delay circuit is formed of one hybrid coupler and two resonators connected to respective divided output ports of the hybrid coupler. The center frequencies of the respective convex group delay circuits are set to be different from each other so that the overall group delay characteristic of the in-band group delay equalizer becomes flat. The bandwidth and the group delay can be easily adjusted. A distortion compensation amplifier with very low distortion can be realized using such an in-band group delay equalizer.

A photon detection device includes a first wafer having an array of photon detection cells partitioned into a plurality of photon detection blocks arranged in the first wafer. A second wafer having a plurality of block readout circuits arranged thereon is also included. An interconnect wafer is disposed between the first wafer and the second wafer. The interconnect wafer includes a plurality of conductors having substantially equal lengths. Each one of the plurality of conductors is coupled between a corresponding one of the plurality of photon detection blocks in the first wafer and a corresponding one of the plurality of block readout circuits such that signal propagation delays between each one of the plurality of photon detection blocks and each one of the plurality of block readout circuits are substantially equal.

The invention relates to a delay equalization method for realization of service code stream irrelevance by automatic mark insertion. According to the scheme, a whole set of channel equalization device which includes a sending part and a receiving part, is adapted to a multi-channel and multi-route network environment, and overcomes channel time varying influence is constructed by technical development such as code stream synchronization, cache adjustment, code stream aligning and the like, the device comprises functions of code stream adaption, mark insertion, code stream sending, code stream receiving, synchronous adjustment, cache aligning processing, uniform clock output and the like, the reliability and the stability of channel data transfer can be improved, and accurate and inerrant data transmission performance and stable and constant signal transfer time delay can be provided on the condition of multi-channel switching.

The invention discloses a navigation receiver radio frequency front end group delay equalization design method and device. The method comprises the following steps: expanding a channel range in a frequency band by M%; measuring the time delay characteristic of the channel group in the expanded frequency band; obtaining denominator group delay of an all-pass filter; carrying out cos fitting on the denominator group time delay, and acquiring a denominator coefficient of the all-pass filter; obtaining a denominator polynomial coefficient; designing a first-stage all-pass filter; acquiring a balanced residual error, abandoning the extended frequency band, and designing a second-stage all-pass filter; and cascading the first-stage all-pass filter and the second-stage all-pass filter to obtain the group delay equalization all-pass filter. According to the invention, the all-pass filter of any group delay is designed by using a complex cepstrum theory, secondary equalization is performed according to the equalization residual error, and finally the group delay can be equalized by using the finite filter order in the specified passband so that the problem of a positioning error caused by related peak distortion brought by the group delay is solved.