Patent application number | Description | Published |
20110044390 | SYSTEM AND METHOD FOR GENERATING AND DETECTING THE IDENTIFIER SEQUENCE OF THE BANDWIDTH-LIMITED TRANSMITTER - A system and method for generating and detecting identifier sequence of a bandwidth-limited transmitter are disclosed, comprising an identifier sequence generating portion and a detection portion. The identifier sequence generating portion comprises: generating a frequency-domain random sequence; generating a frequency-domain orthogonal sequence; performing frequency-domain truncation; performing frequency-time transformation; and performing cycle extension. The identifier sequence receiving portion comprises: truncating the time-domain for the received signal; performing time-frequency domain transformation to obtain a frequency-domain signal; generating frequency-domain random sequence; generating a frequency-domain orthogonal sequence; correlating the frequency-domain orthogonal sequence with the frequency-domain signal de-scrambled by the frequency-domain random sequence; and detecting an output from a frequency-domain correlator by a threshold detecting device and determining the transmitter identifier sequence. The random sequence bandwidth generated by the system and the method of the present invention can be configured flexibly according to transmission bandwidth requirement, and the sequence may be arbitrarily allocated at the power of each frequency point inside the bandwidth. The present invention may be widely applied to multimedia broadcasting, terrestrial radio broadcasting, cable broadcasting and the like. | 02-24-2011 |
20110268206 | METHOD AND DEVICE OF CHANNEL ESTIMATION FOR OFDM SYSTEM - The present invention relates to the field of communication technology. A channel estimation device for an Orthogonal Frequency Division Multiplexing (OFDM) system is provided for performing channel estimation on data based on synchronization signal and pilot, which comprises: a synchronization signal based initial channel estimation module for performing initial channel estimation based on a synchronization signal in the data; a pilot channel tracking module for performing pilot channel tracking on the result of the initial channel estimation; a noise reduction module for performing noise reduction on the result of the pilot channel tracking; and an effective sub-carrier extraction module for extracting channel estimation values of effective sub-carriers from the result of the noise reduction. With the channel estimation method and device for OFDM system according to the present invention, the channel estimation is carried out jointly based on the synchronization signal and the pilot, such that the accuracy of channel estimation can be significantly improved and the performance requirements of the system can be satisfied without increasing the density of pilots and thus reducing the amount of system payload. Moreover, the synchronization signal can still be used for its original purpose of carrier and timing synchronization. | 11-03-2011 |
20120155368 | Method and Device for Service Time Division Multiplexing - A method and device for service time division multiplexing as well as a method and a device for transmitting service are disclosed. The method for service time division multiplexing includes: selecting a part or all of radio frames in one time unit as specific radio frames; and selecting a part or all of subframes in the specific radio frames as specific subframes for sending a specific service. The specific service is a multimedia broadcast multicast service, or a unicast service, or one or more than one kind of services transmitted in broadcast or multicast mode. | 06-21-2012 |
20120155369 | Method and Device for Service Time Division Multiplexing - A method and device for service time division multiplexing as well as a method and a device for transmitting service are disclosed. The method for service time division multiplexing includes: selecting a part or all of radio frames in one time unit as specific radio frames; and selecting a part or all of subframes in the specific radio frames as specific subframes for sending a specific service. The specific service is a multimedia broadcast multicast service, or a unicast service, or one or more than one kind of services transmitted in broadcast or multicast mode. | 06-21-2012 |
20120173949 | METHOD OF CONSTRUCTING PARITY-CHECK MATRIX OF LDPC CODE AND ENCODING METHOD AND ENCODING APPARATUS BASED ON THE METHOD - The embodiments of the present invention provide a method of constructing parity-check matrix of LDPC code. The method comprises the following steps of: constructing a M | 07-05-2012 |
20140198360 | DEVICE FOR RECORDING AND REPRODUCING HOLOGRAPHIC 3D IMAGE, AND METHOD FOR RECORDING AND REPRODUCING HOLOGRAPHIC 3D IMAGE - Devices and methods for recording and reproducing a holographic 3D image are provided. The devices for recording the holographic 3D image comprising: a laser generation unit for emitting a laser beam; a beam splitter unit configured to receive the laser beam from the laser generation unit and split the laser beam into a reference beam and an object beam directed to an object to be photographed; a photorefractive crystal configured to receive the reference beam from the beam splitter and the object beam diffused from the object to form a holographic 3D image; and a rotation unit configured to rotate the photorefractive crystal once every time one holographic 3D image is recorded. The holographic 3D image can be recorded and reproduced by the rotate the photorefractive crystal in light paths of recording and reproduction light beams, respectively. | 07-17-2014 |
20150055543 | METHOD AND DEVICE FOR SERVICE TIME DIVISION MULTIPLEXING - A method and device for service time division multiplexing as well as a method and a device for transmitting service are disclosed. The method for service time division multiplexing includes selecting a part or all of radio frames in one time unit as specific radio frames; and selecting a part or all of subframes in the specific radio frames as specific subframes for sending a specific service. The specific service is a multimedia broadcast multicast service, or a unicast service, or one or more than one kind of services transmitted in broadcast or multicast mode. | 02-26-2015 |
20150153581 | DISPLAY PANEL AND THREE-DIMENSIONAL DISPLAY DEVICE - A display panel and a 3D display device are disclosed. The display panel includes a substrate, pixel units provided at one side of the substrate, a black matrix provided between any adjacent two pixel units, and a phase retardation film provided at the other side of the substrate, the phase retardation film comprises phase delaying units; one side of the substrate provided with the phase retardation film is further provided with a refracting layer, which is used to refract the light emitted from the pixel unit toward the display panel. The display panel shortens the distance of the crosstalk-free area thereto, thereby improving the 3D watching distance and also broadening the viewing angles. | 06-04-2015 |