Patent application number | Description | Published |
20120076233 | APPARATUS AND METHOD FOR TRANSMITTING AND RECEIVING DATA - A data transmission apparatus is provided. A symbol mapper performs symbol mapping on information about an optimum key index that instructs a modified Walsh-Hadamard matrix that causes a minimum peak-to-average power ratio and generates a plurality of key symbols. A modified Walsh-Hadamard transformer generates a plurality of modified Walsh-Hadamard-transformed data symbols by performing modified Walsh-Hadamard transform on a plurality of data symbols according to a modified Walsh-Hadamard matrix that an optimum key index instructs. An inverse Fourier transformer generates a plurality of inverse Fourier-transformed symbols by performing inverse Fourier transform on a plurality of key symbols and a plurality of modified Walsh-Hadamard-transformed data symbols. A transmitter transmits a plurality of inverse Fourier-transformed symbols to a channel through at least one antenna. | 03-29-2012 |
20120144433 | APPARATUS AND METHOD FOR TRANSMITTING MULTIMEDIA DATA IN WIRELESS NETWORK - Provided are an apparatus and method for transmitting multimedia data in a wireless network. The apparatus and method receive multimedia data classified into at least one layer, and set different radio bearer channels for the respective at least one multimedia layer. Here, a service quality parameter is differentially applied to the respective set radio bearer channels, so that end-to-end quality of service (QoS) improvement is maximized. | 06-07-2012 |
20120163357 | METHOD OF RETRANSMITTING AND RECEIVING PACKETS IN HETEROGENEOUS NETWORK ENVIRONMENT - Provided is a method of retransmitting and receiving a packet in heterogeneous network environment. A terminal and a relay base station receive a packet transmitted from a macro base station, and the relay base station informs the terminal of whether the packet is successively received or not. When the packet fails to be received, the terminal is configured to receive the erroneous packet again from at least one of the macro base station and the relay base station. The macro base station and the relay base station may be configured to retransmit the packet through joint processing JP) transmission, and the terminal may be configured to receive the JP transmission. Thus, the method allows the m optimization of a HARQ process and scheduling scheme to efficiently utilize a relay and radio resources, thereby leading to a maximum capacity and quality of wireless network. | 06-28-2012 |
20120188953 | COORDINATED MULTIPOINT TRANSMISSION AND RECEPTION METHOD AND COORDINATED MULTIPOINT TRANSMISSION AND RECEPTION SYSTEM - Provided are a coordinated multipoint transmission and reception method and a coordinated multipoint transmission and reception system for performing the same. In the coordinated multipoint transmission and reception method, a first point and a second point participating in the coordinated multipoint transmission exchange resource allocation information for coordinated multipoint transmission, allocate resources for coordinated multipoint transmission not to overlap each other based on the exchanged resource allocation information, and perform the coordinated multipoint transmission using the allocated resources. Accordingly, use efficiency of radio resources can be improved and embodying complexity can be reduced. | 07-26-2012 |
20130042278 | METHOD AND APPARATUS FOR PROVIDING VIDEO SERVICE - A method and an apparatus for providing video service according to example embodiments of the present invention are disclosed. The method for providing video service according to one example embodiment of the present invention comprises determining based on a predetermined reference whether it is necessary to set multiple bearers to provide the video service for a terminal, and when it is determined necessary to set the multiple bearers, setting an additional bearer, dividing a video source stream into a first stream and a second stream, assigning the first and second streams to a default bearer and the additional bearer, respectively, and transmitting the first and second streams to the terminal. | 02-14-2013 |
20130051479 | METHOD FOR PAYLOAD FORMATTING AND DEFORMATTING FOR BURST LOSS RECOVERY - Disclosed are payload formatting and deformatting methods for burst data loss recovery. The payload formatting method according to an embodiment of the present invention includes: generating an XOR operation packet by performing an XOR operation on the basis of a base layer packet and any one of enhancement layer packets of a group of pictures (GoP), the GoP including the base layer packet and the enhancement layer packets; and adding the XOR operation packet to the GoP. | 02-28-2013 |
20130077714 | APPARATUS AND METHOD FOR TRANSMITTING AND RECEIVING DATA - A data transmitting apparatus generates a plurality of modulation data symbols by performing symbol mapping of input data, converts and angle-modulates the plurality of modulation data symbols from a frequency domain to a real number signal of a time domain, and circular-shifts and transmits the angle-modulated signal from a signal of a frequency domain. | 03-28-2013 |
20130294220 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING SIGNALS - A transmission apparatus couples a first phase modulation signal for first input data and a second phase modulation signal for second input data according to a first coupling method and transmits the coupled signal, and a reception apparatus receives the coupled signal. The reception apparatus derives a signal in which a first phase modulation signal and a second phase modulation signal are coupled according to a second coupling method from a received signal and separates the first phase modulation signal and the second phase modulation signal from the received signal based on the received signal and the derived signal. Furthermore, the reception apparatus obtains the first input data by demodulating the first phase modulation signal and obtains the second input data by demodulating the second phase modulation signal. | 11-07-2013 |
20140294121 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING SIGNAL - Modulation is performed on a first input signal and a second input signal to be transmitted based on symbol mapping. Phase values of the first and second modulated input signals are selectively adjusted. Angle modulation is performed on the first input signal and the second input signal having selectively adjusted phase values. The angle-modulated first and second input signals are transmitted. | 10-02-2014 |
20150015666 | METHOD AND APPARATUS FOR PROVIDING 3D VIDEO STREAMING SERVICE - In order to provide a three-dimensional (3D) video streaming service to a user terminal, user characteristic information including eyesight information of the left eye and the right eye of a user is received from the user terminal. Then, one of quality of a left image and that of a right image is improved in accordance with the eyesight information so that an image with improved quality is transmitted to the user terminal. | 01-15-2015 |