Abstract:
본 발명은, 제1 통신경로로 신호를 수신하는 제1 안테나 장치와, 제2 통신경로로 신호를 수신하는 제2 안테나 장치, 및 상기 제1 안테나 장치 및 제2 안테나 장치 각각으로 수신된 신호의 패킷 스트림에 대해 주기적 잉여 검사(Cyclic Redundance Check : CRC)값을 비교하여 CRC 값이 동일한 패킷이 발견되면 상기 제1 통신경로 및 제2 통신경로 중 하나로 통신경로를 변경하는 데이터 처리기를 포함하는 이동 위성 송수신장치 및 이를 이용한 통신경로 제어방법을 제공할 수 있다. 위성(satellite), 통신경로(communication route)
Abstract:
PURPOSE: An efficient LDPC high speed coding method and an apparatus using the same are provided to obtain linear complexity, by using a coding method directly using a parity check matrix. CONSTITUTION: An arbitrary parity bit generation block(110) generates an arbitrary parity bit. A temporal parity bit generation block(120) receives the arbitrary parity bit and an information vector, and generates a temporal parity bit corresponding to the arbitrary parity bit at every clock. A corrected bit generation block(130) generates a correction bit corresponding to the arbitrary parity bit. A parity bit correction block(140) receives the arbitrary parity bit, the temporal parity bit and the corrected bit. The parity bit correction block generates a corrected parity bit at every clock.
Abstract:
PURPOSE: A 3 layer handover method and system thereof are provided to use fast L3 handover technique which uses a tunnel and to reduce the registration time and agent discovery. CONSTITUTION: A CN(Correspondent Node) and an FN(Fixed Node) transmit packet data(S340). A HA(Home Agent) and an MR(Mobile Router) are registered through a tunnel between the HA and the MR on a wireless network(S250, S255). The tunnel is released between the HA and the MR. The CN and the FN directly transmit packet data through the HA and the MR(S260).
Abstract:
PURPOSE: A service providing system in a satellite communication system by allocating resources and power to hierarchical antenna multi beams, and a method thereof are provided to improve the efficiency in the use of power by reducing the power consumption of a system. CONSTITUTION: A service providing system in a satellite communication system includes a satellite(102), a first terminal(170), a gateway(104), a core network(106), an access network(110), a BS(Base Station)(108), a CGC(Complementary Ground Component)(132), and a plurality of terminals. The satellite is a satellite BS configured to provide a communication service by using hierarchical multi-beams. The first terminal is located in a suburb to receive the communication service from the satellite. The gateway is configured to connect signal transmission and reception between the satellite and a terrestrial system. The core network is included in the terrestrial system and configured to transmit and receive signals to and from the satellite through the gateway. The gateway is a centralized gateway or one gateway of geographically distributed gateways, depending on the satellite communication system or requirements from an operator of the satellite communication system. The gateway is connected to the BS as a sub system which is connected to the core network or the access network. In the satellite communication system, the satellite forms the hierarchical multi-beams through an MIMO(Multi-Input Multi-Output) scheme in which one satellite uses a polarization characteristic of an antenna, or a plurality of satellites form the hierarchical multi-beams and transmit a signal to provide a communication service. Accordingly, the data transmission capacity may be increased, and the data reception function may be improved.
Abstract:
본 발명은 발열 모듈과 상기 발열 모듈을 둘러싸는 레이돔 및 하부 커버를 구비하는 안테나 모듈의 온도를 제어하는 시스템에 관한 것이다. 이와 관련하여 본 발명의 발열 모듈과 상기 발열 모듈을 둘러싸는 레이돔 및 하부 커버를 구비하는 안테나 모듈의 온도를 제어하는 시스템은, 안테나 모듈의 내부에 설치되는 내부열 집열 수단; 안테나 모듈의 외부에 설치되는 내부열 방열 수단; 및 내부열 집열 수단과 내부열 방열 수단 사이에서 열을 전달하는 열 전달 수단을 포함한다. 이러한 본 발명에 의하면 단열 재질로 된 레이돔 및 하부 커버로 둘러싸인 안테나 내부에서 발생하는 열을 외부로 배출시키고 외부에서 들어오는 열을 차단하여 안테나 내부 온도를 일정 범위로 유지시킬 수 있다. 이동형 안테나, 발열, 레이돔, 온도 제어, 방열 비아, 허니콤
Abstract:
본 발명은 마이크로스트립 안테나에 관한 것으로서, 두 개의 슬롯을 포함하는 다중 대역 마이크로스트립 안테나에 관한 것이다. 본 발명에 마이크로스트립 안테나는 제1 홀을 구비하는 도체판과, 서로 다른 크기를 갖는 두 개의 슬롯이 삽입된 마이크로스트립 패치를 구비하며, 도체판 상부에 위치하는 기판을 포함한다. 안테나, 이중 대역
Abstract:
PURPOSE: A hierarchical random access method for a wireless communication system having very large cell area are provided to design slot length to integral times of basic slot length according to timing error compensation capability, thereby enabling terminals to user various slot lengths. CONSTITUTION: Terminals not having a timing compensation capability uses the first slot(110). According to timing compensation capability, terminals without timing compensation capability uses two more slots(120,130). According to capability of terminals, many RACH slots are assigned to terminals. Therefore, the terminals has much more random access chances at the same time. In hierarchical RACH structure, whole preamble sequence(111) assigned to RACH is assigned according to a layer.
Abstract:
There is provided a frequency Selective Surface (FSS) structure for multi frequency bands configured with unit cells, each including a loop unit, arranged at regular intervals, wherein each unit cell includes: a dielectric layer; and the loop unit having a fixed width and formed on the dielectric layer, wherein the loop unit includes a first loop and a second loop formed inside the first loop with a predetermined space away from the first loop, each of the first loop and the second loop being formed sinuously in at least one portion.