757 results about "Isochronous signal" patented technology

The present invention relates to a wireless communication system, and more particularly, to a method and an apparatus for providing downlink reference signal transmission power information in a wireless communication system that supports multiple antennas. A method for providing demodulation reference signal transmission power information according to one embodiment of the present invention comprises: a step of mapping a main synchronous signal onto a predetermined OFDM symbol of a downlink pilot time slot (DwPTS) subframe; a step of mapping, in a code division multiplexing manner, a demodulation reference signal over two or more OFDM symbols containing said predetermined OFDM symbol in the DwPTS subframe; a step of transmitting the DwPTS subframe to which the main synchronous signal and the demodulation reference signal are mapped; and a step of transmitting information on the transmission power for transmitting the demodulation reference signal mapped onto said predetermined OFDM symbol.

The invention relates to a method for processing synchronous signal blocks, a base station and user equipment. The synchronous signal blocks include first synchronous signal subblocks and second synchronous signal subblocks. In each synchronizing cycle, the method comprises the following steps: sending the first synchronous signal subblocks corresponding to all wave beams in the synchronizing cycle according to a preset first wave beam scanning sequence; and sending the second synchronous signal subblocks corresponding to all wave beams in the synchronizing cycle according to a preset second wave beam scanning sequence, wherein the first wave beam scanning sequence and the second wave beam scanning sequence are different, and therefore, relative offsets of the time domain between each first synchronous signal subblock and the corresponding second synchronous signal subblock are different. By utilizing the scheme, the processing complexity of the synchronous signal blocks can be reduced.

A digital broadcasting transmission system and method thereof. The digital broadcasting transmission system, comprises an RS encoder to encode a dual transport stream (TS) which includes a normal stream and a plurality of turbo streams multiplexed together, an interleaver to interleave the encoded dual TS, a turbo processor to detect the turbo streams from the interleaved dual TS and to encode the detected turbo stream, and a trellis encoder to pseudo2 (P-2) vestigial sideband (VSB) code the turbo-processed dual TS, and, then, to perform trellis encoding, and a main multiplexer (MUX) to multiplex the trellis-encoded dual TS by adding a field synchronous signal and a segment synchronous signal thereto.

An apparatus to detect a sync signal, a VSB receiver using the same, and a method thereof. The apparatus includes a plurality of partial correlators to calculate a first partial correlation value between a sub sequence of a training sequence and an “I” signal of a received signal that corresponds to a range of a sub sequence and a second partial correlation value between the sub sequence of the training sequence and a “Q” signal of the received signal, and calculating the first partial correlation value and the second partial correlation value for each of the predetermined number of sub sequences, a plurality of squarers to square the first and second partial correlation values for each sub sequence, respectively, a plurality of adders to add the squared first and second partial correlation values for each sub sequence and add the added squared partial correlation values of all the sub sequences to provide a correlation signal between the training sequence and a corresponding portion of the received signal, a maximum value detection unit to detect a maximum one of the added partial correlation values of the sub sequences from the correlation signal, and a position detection unit to detect a position of the detected maximum value as the sync signal of the received signal.

A broadcast method and communication system of a wireless network is disclosed. In a wireless network consisting of a plurality of connected devices in which one device is selected to be a coordinator and the rest of the devices are synchronized to a synchronous signal broadcasted by the coordinator, the broadcast method includes the steps of checking whether one of a current channel and a PAN ID of the wireless network needs to be changed; and inserting a change information for changing one of the channel and the PAN ID in the synchronous signal and broadcasting the synchronous signal, when one of the channel and the PAN ID is determined to be changed in the checking step.

A synchronous regulation circuit is provided. A secondary-side switching circuit is coupled to the output of the power converter to generate a synchronous signal and a pulse signal in response to an oscillation signal and a feedback signal. An isolation device transfers the synchronous signal from the secondary side to the primary side of the power converter. A primary-side switching circuit receives the synchronous signal to generate a switching signal for soft switching a transformer. The pulse signal is utilized to control a synchronous switch for rectifying and regulating the power converter. The synchronous switch includes a power switch and a control circuit. The control circuit receives the pulse signal for turning on or off the power switch. The power switch is connected between the transformer and the output of the power converter. A flyback switch is operated as a synchronous rectifier to freewheel the inductor current of the power converter. The flyback switch is turned on in response to the off state of the power switch. The turn-on period of flyback switch is correlated to the turn-on period of the power switch.

A frequency and symbol timing synchronization apparatus for orthogonal frequency division multiplexed (OFDM) signals, and a method performed by the apparatus are provided. This apparatus includes an autocorrelation unit, a comparator, a peak flat detector, a frequency offset estimator, a frequency offset compensation unit, a cross correlation unit and a symbol timing synchronization unit. The autocorrelation unit receives data including a synchronizing symbol made up of at least three identical synchronizing signals, delays the received data by a predetermined delay amount, performs autocorrelation between the received data and the delayed data, normalizes an autocorrelated value, and outputs a normalized autocorrelated value. The comparator compares the normalized autocorrelated value with a predetermined threshold value. The peak flat detector detects as a flat section a section where the normalized autocorrelated value is equal to or greater than the threshold value. The frequency offset estimator estimates a frequency offset within the flat section to obtain a frequency offset value. The frequency offset compensation unit compensates for the frequency offset of a received signal using the frequency offset value. The cross correlation unit performs cross correlation using a frequency offset-compensated signal and a reference signal, and normalizes the cross-correlated value to output a normalized cross-correlated value. The symbol timing synchronization unit detects a point where the cross-correlated value is maximum, and performs symbol timing estimation, thereby performing symbol timing synchronization. In the symbol timing and frequency synchronization apparatus and method, accurate frequency synchronization can be achieved because a large sample error can be allowed. Also, a symbol timing error can be reduced since symbol timing synchronization is achieved using a frequency offset-compensated signal.

An ultrasonic diagnostic apparatus is configured as follows. Namely, an ultrasonic diagnostic apparatus is provided with a control unit which collets a heart synchronized signal, etc. synchronizing with workings of a heart of a patient, etc., and an image processing unit which detects an overlapped area of the three-dimensional data acquired by ultrasonic scanning from different echo windows, for the three dimensional image data group acquired in the same time phase in synchronization with the heart synchronized signal or aspiration synchronized signal, combines the three-dimensional image data, and generates a panorama three-dimensional image data group consisting of panorama three-dimensional image data which are continued in time and have a display area larger than each of the three-dimensional image data.

Disclosed are methods and apparatus for automatic visual detection of events, for recording images of those events and retrieving them for display and human or automated analysis, and for sending synchronized signals to external equipment when events are detected. An event corresponds to a specific condition, among some time-varying conditions within the field of view of an imaging device, that can be detected by visual means based on capturing and analyzing digital images of a two-dimensional field of view in which the event may occur. Events may correspond to rare, short duration mechanical failures for which obtaining images for analysis is desirable. Events are detected by considering evidence obtained from an analysis of multiple images of the field of view, during which time moving mechanical components can be seen from multiple viewing perspectives.

A synchronous regulation circuit is provided to improve the efficiency for an offline power converter. A secondary-side switching circuit is coupled to the output of the power converter to generate a synchronous signal and a pulse signal in response to an oscillation signal and a feedback signal. An isolation device transfers the synchronous signal from the secondary side to the primary side of the power converter. A primary-side switching circuit further receives the synchronous signal to generate a switching signal for soft switching a transformer. The pulse signal is utilized to control a synchronous switch for rectifying and regulating the power converter. The synchronous switch includes a power switch and a control circuit. The control circuit receives the pulse signal for turning on/off the power switch. The power switch is connected in between the transformer and the output of the power converter. In addition, a flyback switch is operated as a synchronous rectifier to freewheel the inductor current of the power converter. The flyback switch is turned on in response to the off of the power switch. The on time of flyback switch is correlated to the on time of the power switch.

A method and apparatus for managing resources for Peer-to-Peer (P2P) communication in a wireless communication system. A mobile station (MS) attempting to establish P2P communication receives a P2P amble signal transmitted on at least one adjacent P2P link, measures a signal strength for the P2P amble signal, reports the measurement results to a base station (BS), and performs the P2P communication using a P2P resource that is assigned by the ES according to the measurement results. The ES assigns a resource different from the resource assigned to a P2P link having a highest signal strength measured, as a resource for the P2P communication, thereby preventing possible interference caused by adjacent P2P links.

A splicing controller of multi-screen display consists of high definition video signal source and decoder. It is featured as outputting signal to display sub-screen image data generation circuit formed by phase-locked loop, synchronous signal generator, buffer storage controller, buffer storage and internal circuit of display sub-screen.

A network including a plurality of nodes each configured as transmitters, receivers, or transceivers. At least one of the nodes may be configured to wirelessly transmit a repeating isochronous signal for reception by one or more of the other nodes. The isochronous phase and/or frequency of the repeating isochronous transmission may be variably adjusted to reduce signal interference.

The invention discloses an inter-cell D2D communication method, UE and a base station. The inter-cell D2D communication method includes the following steps that first UE in a first cell obtains information of a second cell. The information of the second cell includes the D2D communication frequency and a cell ID of the second cell; a downlink synchronizing signal of the second cell is searched for by the first UE on the D2D communication frequency of the second cell according to the cell ID of the second cell to obtain downlink timing of the second cell; the first UE determines sending timing of a message sent to the second UE in the second cell according to the downlink timing of the second cell; the first UE sends the message according to the sending timing on the D2D communication frequency of the second cell and receives a message sent by the second UE on the D2D communication frequency of the first cell. By means of the inter-cell D2D communication method, the user equipment and the base station, inter-cell D2D communication can be achieved.

The invention discloses cell search method and equipment. The cell search method comprises the following steps that UE (User Equipment) searches a main synchronous signal; the UE searches more than one main synchronous signal relevant peak value position and corresponding main synchronous sequence in a relevant search window; the UE searches a secondary synchronous signal according to the relative position relationship of the main synchronous signal and the secondary synchronous signal specified in an FDD ((Frequency Division Duplex) protocol by one of the main synchronous signals and searches a secondary synchronous signal according to the relative position relationship of the main synchronous signal and the secondary synchronous signal specified in a TDD (Time Division Duplex) protocol by another main synchronous signal; if a relevant peak value of the secondary synchronous signals is found out, cell initial search is finished, and the corresponding secondary synchronous signal sequence is recognized; and otherwise, the secondary synchronous signal is searched according to the relative position relationship specified in another duplex mode protocol on the basis of the detecting position of the next main synchronous signal till the cell initial search is finished. The invention can improve the cell search speed when the synchronous signal and the synchronous sequence in two modes of FDD and TDD are simultaneously transmitted on the same carrier.

Methods and apparatus for synchronizing a stereo viewing device in a multiple end-view environment. Two or more video streams and a corresponding number of signals, each synchronous with one of the video streams, are provided. Each of the video streams may have a different refresh rate. One of the video streams is selected for stereo viewing, and a corresponding synchronizing signal is selected. The selected synchronizing signal is used to generate a control signal that synchronizes a stereo viewing device to the selected video stream.

Provided are a method and a system for recognizing a location to control the location of a moving object by installing an ultrasonic satellite transmitting an ultrasonic signal. The method includes generating a synchronizing signal at a plurality of the ultrasonic satellites. The ultrasonic satellites simultaneously transmit the ultrasonic signals respectively having different frequency from each other. A receiver of the moving object receiving the ultrasonic signal measures a distance between the receiver of the moving object and each ultrasonic satellite by classifying a frequency of the ultrasonic signal, and calculates a current location of the moving object by using the measured distance. The system includes ultrasonic satellites for transmitting ultrasonic signals, a moving object for recognizing a current location by receiving the ultrasonic signals from the ultrasonic satellites, a reference time broadcasting device for providing a synchronizing signal to the ultrasonic satellites and the moving object in operation, and a server for providing coordinates of the ultrasonic satellites to the moving object.

The invention relates to a three-dimensional imaging system for calculating correlation flight time by means of sparse aperture compression. The three-dimensional imaging system comprises a pulse light source emission unit, an expanded beam lens, a fourth collimating lens, a random optical modulation unit, a polarized light beam splitter, a first lens, a beam spot synthesis unit, a sparse aperture unit, a free space collimation unit, a beam reflection unit, a total-reflection mirror, a convergence light receiving lens, an optical detector, a flight time correlation unit and a compression calculation correlation algorithm module. The sparse aperture unit comprises at least three secondary telescope lenses, the free space collimation unit comprises at least three collimating lenses, and the beam reflection unit comprises at least three reflection mirror groups; one secondary telescope lens, one collimation lens and one reflection mirror form a light path; the flight time correlation unit comprises a pulse width regulation unit, an adjustable delay unit and a synchronous signal source.