Abstract:
PURPOSE: An image display device and a method thereof are provided to display a 3D image by a multilayered barrier method. CONSTITUTION: A measuring unit(850) measures the distance between a viewer who watches a 3D image and a screen, right/left locations, and the face slope of the viewer. A barrier controller(860) selects and controls a parallax barrier using a signal measured by the measuring unit. A barrier switch(870) switches a parallax barrier by control of the barrier controller. A multi-layer parallax barrier(820) is turned on/off by switching of the barrier switch to transmit/block light. An LCD panel(810) displays a 3D image by the light.
Abstract:
PURPOSE: A duplex mode satellite VSAT(Very Small Aperture Terminal) terminal device and a control method are provided to switch the modulation manner of the IDU(InDoor Unit) according to a ODU(OutDoor Unit) environment and the satellite link environment ODU(OutDoor Unit). CONSTITUTION: An IDU(300) switches over the modulation manner into linear or nonlinear manner according to the control signal. A controller(400) outputs the control signal according to existence and nonexistence of the performance capability of ODU and the transmission power output control function. A IDU comprises a transmission and reception modem unit. A IDU switches over the linear or nonlinear manner the modulation manner inputted to an transmitting terminal among the transmitting and receiving modem part according to is the control signal.
Abstract:
PURPOSE: A packet alignment time shortened method in the layer 3 hand over and a move mode satellite terminal device adopting the same are provided to minimize the packet alignment processing time by using the mobile-network technology of the IPv4 internet protocol base in the hand over to the wireless network. CONSTITUTION: A satellite network interface(310) forms a satellite link for data transmit and receive in a network of satellites. An wireless network interface(320) forms a radio link for data transmit and receive in an wireless network. A controller(330) is connected to the satellites network interface and the radio network interface. A controller processes transceiver data at the satellite link or the radio link. An order control determining unit(360) detects an order control packet received from the network of satellites, when the handover function is performed among the wireless network.
Abstract:
PURPOSE: A multiple multimedia service terminal transmitting device and multiple multimedia service providing method capable of providing are provided to transmit voice information by using existing frequency band. CONSTITUTION: A communication broadcasting triple play IP data(240) is inputted. An internet and a TV data permitting a long delay time are inputted to the existing DVB-S2 LDPC encoder(150). Voice data permitting only a short-delay time is inputted to a 4K mode LDPC encoder(250) based on DVB-RCS +M standard. An encoded internet, TV data and voice data are orthogonally modulated by respective DVB-S2 modulators(160,260). Voice data which is orthogonally modulated is inputted to a DVB-RCS diffusion unit(270). By using an orthogonal code minimizing interference between users, it is diffused according to diffusion coefficient.
Abstract:
PURPOSE: An interior position measuring device using a digital broadcasting signal and a method thereof are provided to efficiently measure a position even indoors. CONSTITUTION: A receiving unit(331) receives a digital broadcasting signal including navigation information from digital broadcasting signal transmitting devices. An output unit(334) outputs a signal to the outside of a receiving device by a wireless communication method. The receiving unit receives a digital broadcasting signal from the digital broadcasting signals.
Abstract:
본 발명은 이동체 탑재용 안테나 시스템에 관한 것이다. 본 발명에서, 주파수 변환부를 포함하는 일부 고주파 모듈과 전원분배부를 안테나 시스템의 레이돔 외부에 위치하는 외부 고정부에 위치시킨다. 또한, 안테나 바닥판의 내측면에 능동쿨러/냉각핀, 히터, 공기순환팬을 설치하고, 안테나 바닥판의 외측면에 냉각핀, 냉각팬 등을 설치한다. 위성 추적, 안테나, 4중 대역 안테나, 이동체, 레이돔
Abstract:
PURPOSE: An MPE-FEC Reed-Solomon decoder and a decoding method are provided, which consider the hardware complexity and the processing speed of the reception terminal, and can reduce the error location polynomial calculation of the Reed-Solomon decoder. CONSTITUTION: A value corresponding to the delete error location is replaced with 0(S1) in the receiving signal. A syndrome is calculated by using the received signal(S2). A readjusted syndrome is calculated(S4) by using the delete location polynomial expression and the syndrome. A delete error size polynomial expression is calculated(S5). The error size is calculated(S7) by using the readjusted Pony algorithm. The error is corrected through the error location and the calculated error size(S8).
Abstract:
PURPOSE: A method for interaction between ARQ and HARQ of a system with a long shuttling delay time is provided to quickly cope with a transmission error by re-transmitting a packet of a window on standby when an error in which NACk of HARQ is mistaken for ACK occurs. CONSTITUTION: A transmission buffer(210) and a transmit window are influenced by the HARQ feedback information. A buffer on standby(220) and an window on standby are influenced by a status report information packet(230). The buffer on standby detects an error in which NACK is recognized as ACK in HARQ. The buffer on standby re-transmits the packet of the buffer on standby by receiving feedback information concerning the error.
Abstract:
PURPOSE: A mobile satellite communications apparatus and a method thereof are provided, which maximizes frequency use efficiency. CONSTITUTION: If data are received from a mobile terminal, a satellite signal sensing part(421) senses a satellite signal. A subcarrier deciding unit(423) recognizes a subcarrier group used for communications between a mobile terminal and a satellite using a satellite signal. A communications unit(425) communicates with the mobile terminal using subcarrier groups except for the subcarrier group. If the ground auxiliary device locates in the central area of a beam, the subcarrier deciding unit recognizes the first subcarrier group used in communications between the satellite locating in the border of the beam and the mobile terminal.
Abstract:
PURPOSE: A satellite communication transceiver for mitigating interference is provided to improve performance in mobile body Doppler environment and non-linear amplification module by applying a band spreading technology based on direct sequence to a DVB-S2(Digital Video Broadcasting-via Satellite second generation) system. CONSTITUTION: A modulator(100) modulates a satellite communication signal. A band spreading unit(110) transmits the signal to outside after band spreading. The band spreading unit includes a matching filter unit(120), a decimation unit(130) and a direct sequence band spreading unit(140). The direct sequence band spreading unit includes a band spreading code applier(150), a scrambling unit(160), a oversampling unit(170) and a pulse forming unit(180).