36results about How to "Synchronization is stable" patented technology

An apparatus and method for performing coarse frequency synchronization in an orthogonal frequency division multiplexing (OFDM) receiver includes cyclically shifting a received signal X(k) by a predetermined shift amount d, determining the length of a summation interval according to a phase coherence bandwidth and a number K of sub-bands into which the summation interval is divided, generating and adjusting a symbol time offset according to the number K of sub-bands, generating a weighted phase reference signal Z(k) which is phase-shifted by the symbol time offset and weighted by a weighting vector determined according to a frequency band, partially correlating the shifted signal X(k+d) and the weighted phase reference symbol Z(k) and calculating a partial correlation value for each of the K sub-bands; and determining the shift amount d_max at a maximum sum of the partial correlation values and outputs the shift amount d_max as an estimated coarse frequency offset.

Disclosed is a system and a training sequence setting method for performing frame synchronization in a wireless communication system. A received signal is affected by a frequency offset due to an oscillator mismatch between the transmitter and the receiver, which is one of the main causes of performance degradation of frame synchronization. In a prior Constant Amplitude Zero Auto-Correlation (CAZAC) sequence, the larger the frequency offset becomes, the more conspicuously the performance degradation of the frame synchronization occurs. The proposed training is designed to maintain a prior CAZAC property during a differential detection so as to perform a differential detection-based frame synchronization sequence insensitive to the frequency offset. As a result of performance verification, the proposed training sequence indicates that its performance of the frame synchronization is irrespective of the frequency offset, and has a better performance than the prior CAZAC sequence and random sequence.

Disclosed is an adaptive method for reducing power consumption in a standby mode of a digital radio communication terminal. The method comprises the following steps of: calculating the difference of edge timings between a main clock and a low clock; comparing the calculated timing difference with a predetermined difference reference value; and upgrading or downgrading a catnap period according to a result of the step of comparing.

A three-dimensional display system including a display and a pair of three-dimensional glasses having a light sensor is provided. The display includes a backlight driving module and a backlight module, wherein the backlight driving module modulates an original synchronization signal to generate a modulated backlight driving signal for driving the backlight module to generate a backlight. The display alternatively generates a left eye image and a right eye image according to a three-dimensional image signal. The three-dimensional glasses then determines whether the image output from the display is the let-eye image or the right-eye image based on the variation in brightness of the backlight generated by the backlight module of the display.

The present invention discloses a carrier wave synchronization method and the equipment for a digital television ground broadcast transmission system receiver, which belongs to the digital information processing field. The present invention is characterized in that: first of all, after the frame synchronization, the receiving terminal locally creates a PN serial which is accordant with the receiving frame head, the frequency can be estimated according to the relative results of the fore and after sub serial of the flame head, and the frequency offset signal can be compensated by passing through the loop circuit filtering. The carrier wave synchronization proposal of the present invention is suitable for the flame structures of two modes, the single carrier wave and the multi carrier wave, and at the same time the proposal has the advantages that the synchronizing speed is quick, the anti-noise performance is good, and the present invention suitable for hardware realization.

A synchronization establishing apparatus in a spectrum spread communication system, includes a search section that calculates correlation values from a received spectrum spread signal, and calculates power values and power addition values of the power values. Also, the search section selects larger ones of the power addition values to output together with timing data corresponding to the selected larger power addition values. One of the symbols and the power values is corrected in phase based on phase change quantities. A frequency offset estimating section estimates frequency offsets from one of the correlation values and the power values and demodulation timing data and calculates the phase change quantities from the estimated frequency offsets. A demodulation path selecting section selects path timings based on the selected larger power addition values and outputs the demodulation timing data to the frequency offset estimating section.

The invention discloses a preparation method for an amorphous alloy enhanced racket. The method comprises the steps that S1, amorphous alloy strips are connected with two ends of carbon cloth, and oneend of each amorphous alloy strip extends outside of the carbon cloth by 10 mm-100 mm; S2, the carbon cloth is rolled into a long strip shape, the extended amorphous alloy strips are packaged by oneend of the long strip-shaped carbon cloth and then are wrapped by carbon yarns; S3, the rolled long strip-shaped carbon cloth is made into an initial shape of a racket frame; S4, a clamping slot is set at the middle part of a connection part of a racket stick and the racket frame, and an amorphous alloy plate is inserted into the clamping slot; and S5, the connection part of the racket stick and the racket frame is intertwined by carbon fiber cloth, the racket stick and the racket frame are connected to form a racket blank, the racket blank is placed into a shaping mould, the racket blank is cured and shaped under a heating condition of 120-160 DEG C, and after cooling is carried out, a shaped semi-finished product badminton racket is taken out from the mould. According to the method, through utilization of excellent performance such as high strength, high elasticity, high hardness and light weight of an amorphous alloy material, strength at the connection part of the racket frame andthe racket stick is enhanced, and a fracture risk at the part is reduced.

The invention relates to a vacuum presser which comprises a distributor, a pressing system, an unloading device, a vacuum system, a driving system, two pieces of filter cloth and a frame, wherein the pressing system is arranged on the top and the middle lower part on the right side of the frame; the distributor is arranged at one end of the top of the pressing system; the unloading device is arranged on one side, which is opposite to the distributor, of the pressing system; the vacuum system is arranged on the left lower part of the frame; the driving system is arranged on the frame below the unloading device; the two pieces of filter cloth are respectively wound into two closed loops; the two pieces of filter cloth are meshed in the right middle part of the pressing system. The traditional pressing dehydration and vacuum negative pressure dehydration are perfectly combined together, and materials can be well treated, so that the equipment is wide in application range, and the dehydration efficiency in unit time is greatly improved.

The invention relates to a 2SSX parallel quantization coding method for an all-optical analog-to-digital converter. The method is as follows: the N-bit all-optical analog-to-digital converter is designed; stable sounding optical pulses and steering optical pulses (analog optical) are input into a splitting coupler array (2) through a wavelength division multiplexer or a polarization coupler (1); the coupler array (2) is formed by series connection of N-1 1x2 couplers, wherein, one output port of each 1x2 coupler is connected with a symmetrical Sagnac interferometer (3) and the other output port of each 1x2 coupler is connected with the next 1x2 coupler; an attenuator or an optical amplifier (4) is arranged on a position of each symmetrical Sagnac interferometer (3) close to a 3dB coupler; optical fiber microwave circulators or isolators (5) are arranged on the front of reflecting ports; and the output ports can be transmission ports of the Sagnac interferometers and also can be the reflecting ports and are provided with a band-pass filter or an analyzer (6) which only allows probe light to pass. The structure is combined with adequate splitting ratio of the coupler array (2) and adequate coefficients of the attenuator or the optical amplifier (4), so that the probe light generates Gray codes of parallel output light.

The invention discloses a full-optical analog-digital converter NAMSX parallel quantizing coding method, which designs a N-bit analog-digital converter: a stable detection optical pulse and a control optical pulse (an analog light) input 1XN couplers [2] light splitting via a wavelength division multiplexer or a polarization coupler [1] and then input N asymmetrical Michelson interferometers [3]; each asymmetrical Michelson interferometer [3] is provided with a fibre circulator [4] at a reflection hole thereof; a pass filter or an analyzer (5) is provided at a transmission output hole to only permit the detection light to get through. The above structure with proper coupler [2] light splitting ratio and the coupler light splitting ratio of each asymmetrical Michelson interferometer enables the detection light to output light Grey complement code.

The invention discloses a 2ASSX parallel quantization coding method for an all-optical analog-to-digital converter. The method is as follows: the N-bit all-optical analog-to-digital converter is designed; stable sounding optical pulses and steering optical pulses (analog optical) are input into a splitting coupler array (2) through a wavelength division multiplexer or a polarization couplers (1); the coupler array (2) is formed by series connection of N-1 1x2 couplers, wherein, one output port of each 1x2 coupler is connected with an asymmetric Michelson interferometer (3) and the other output port of each 1x2 coupler is connected with the next 1x2 coupler; an optical fiber microwave circulator or an isolator (4) is arranged on the front of a reflecting port of each asymmetric Michelson interferometer (3); and a transmission port is provided with a band-pass filter or an analyzer (5) which only allows probe light to pass. The structure is combined with adequate splitting ratio of the coupler array (2) and the splitting ratios of couplers of each asymmetric Michelson interferometer (3) to realize parallel output of Gray code pulses by the probe light.

The invention discloses a parallel quantification coding method for an all-optical analog-digital converter 2MX, which is used for designing an N-bit analog-digital converter and includes the structure that: the stable pulse of detecting light and the stable pulse of control light (analog light) pass through a wavelength division multiplexer or a polarization coupler (1) and then are inputted into that a 1 is multiplied by N coupler (2) for the beam splitting and into N non-symmetrical Mach-Zehnder interferometers. The direct input port of each non-symmetrical Mach-Zehnder interferometer is provided with a band wave filter or an analyzer (4), thereby the detecting light is only allowed to pass. Combined with the splitting ratio of the proper coupler (2) and the splitting ratio of the first coupler of each non-symmetrical Mach-Zehnder interferometer, the structure causes the detecting light to output a Gray code pulse in parallel.

The invention provides a memory state data synchronization method and device. The method comprises the steps that a first application service node and other application service nodes in a distributedapplication service subscribe to the same memory state data theme of a message middleware platform, and the other application service nodes are all application service nodes except the first application service node in the distributed application service; the first application service node performs memory state data synchronization with the other application service nodes based on the memory statedata theme through the message middleware platform. According to the method and the device, the problems of non-persistence of subscription relation and non-persistence of messages in data synchronization of cluster services coordinated by redis in related technologies can be solved, memory state data synchronization among distributed application services is realized through themes of a message middleware platform, so that a message synchronization function is stable, and messages can be persisted.

Stable clock synchronization is ensured even under a multi fading environment such as the non-line-of-sight communication.

On a transmission side, multiplying a clock signal by a spreading code, a spread-spectrum clock signal is generated whose spectrum being made to spread; frequency conversion is performed on a signal obtained by superimposing an information signal on the spread-spectrum clock signal and a radio signal is transmitted by wireless. On the other hand, on a receiving side, the radio signal is received, frequency conversion is performed on the radio signal, and a frequency-converted radio signal is divided into two lines. A clock signal extracted by performing spectrum despreading on one of divided radio signals by multiplying a spreading code; and clock synchronization is performed on other one of the divided radio signals using the clock signal having been extracted.

The invention discloses an all-optical analog-to-digital converter NASSX parallel quantization coding method; an N-bit analog-to-digital converter is designed to stably detect optical pulses and control the optical pulses (analog light) to be input into a coupler [2] (1 multiplied by N) for splitting through a wavelength division multiplexer or a polarization coupler [1] and then to be input into N asymmetrical Sagnac interferometers [3]; a fibre circulator [4] is arranged in front of the reflection port of each asymmetrical Sagnac interferometer [3]; the output port of the fibre circulator [4] is provided with a band pass filter or an analyser [5] which only allows detecting lights to pass. The structure of the invention combined with suitable coupler [2] splitting ratio and the coupler splitting ratio of each asymmetrical Sagnac interferometer [3] leads the detecting lights to output optical gray reversed codes in parallel.

With a method for synchronization in a communication system that includes a central participant and at least one further participant, at least one of the further participants being synchronized with the central participant, and, to this end, a telegram with synchronization information being transmitted by the central participant to the at least one further participant, particularly efficient synchronization of the at least one participant with the central participant results due to the fact that the telegram is a data telegram.

The invention discloses an all-optical analog-to-digital converter 2ASSX parallel quantization coding method; an N-bit analog-to-digital converter is designed to stably detect optical pulses and to control the optical pulses (analog light) to be input into a beam-splitting coupler array [2] through a wavelength division multiplexer or a polarization coupler [1]; the coupler array [2] is formed by that N-1 couplers (1 multiplied by 2) are connected in series, wherein, the output port of each coupler (1 multiplied by 2) is connected with an asymmetrical Sagnac interferometer [3] and the other output port thereof is connected with the next coupler (1 multiplied by 2); a fibre circulator [4] is arranged in front of the reflection output port of each asymmetrical Sagnac interferometer [3]; the output port of the fibre circulator [4] is provided with a band pass filter or an analyser [5] which only allows detecting lights to pass. The structure of the invention combined with suitable coupler array [2] splitting ratio and the coupler splitting ratio of each asymmetrical Sagnac interferometer [3] leads the detecting lights to output optical gray reversed codes in parallel.

The invention relates to an all-optical analog-to-digital converter NSSX parallel quantization coding method; an N-bit all-optical analog-to-digital converter is designed to stably detect optical pulses and to control the optical pulses (analog light) to be input into a coupler [2] (1 multiplied by N) for splitting through a wavelength division multiplexer or a polarization coupler [1], and then to be respectively input into N symmetric Sagnac interferometers [3] to be output in parallel; the position of each symmetric Sagnac interferometer [3] close to the 3dB coupler is provided with an attenuator or an optical amplifier [4]; a fibre circulator or a separator [5] is arranged in front of the reflection port; the output port can be a transmission port or the reflection port of the Sagnac interferometer; the output port is provided with a band pass filter or an analyser [6] which only allows detecting lights to pass. The structure of the invention combined with suitable coupler [2] (1 multiplied by N) splitting ratio and the attenuator or the optical amplifier [4] coefficient leads the detecting lights to output optical gray reversed codes in parallel.