Abstract:
본 발명은, DMB 전송신호 품질 측정 장치 및 그 방법과, 그를 이용한 DMB 방송 수신 시스템에 관한 것으로서, 방송망을 통하여 수신된 DMB 전송신호로부터 에러 보정 전에 직교변조 신호(예를 들면, I/Q 신호)를 생성하여 신호 품질을 측정함으로써, 신호 품질의 정확성을 높이고자 한다. 이를 위하여, 본 발명은, DMB 전송신호 품질 측정 장치에 있어서, DMB 전송신호를 수신하여 디지털 IF(Intermediate Frequency) 신호로 변환하기 위한 수신 처리 수단; 상기 디지털 IF 신호를 복조하여 직교변조 신호를 생성하기 위한 복조 수단; 및 상기 직교변조 신호를 이용하여 신호품질 측정값을 구하기 위한 신호품질 측정 수단을 포함한다. DMB, 지상파 DMB, RF 신호 분석, 직교변조 신호, I/Q 신호, 신호품질 측정
Abstract:
The present invention relates to a method and apparatus for transmitting digital broadcasting signals and a method and apparatus for receiving digital broadcasting signals that divide a stream into a plurality of layers according to characteristics of the stream, that independently process the layers, and that dynamically allocate frequencies on the basis of the processed signals. A method of transmitting digital broadcasting signals includes dividing a single stream into a plurality of layers according to characteristics of the stream; performing encoding and mapping on each of the layers; and dynamically allocating a frequency to each of the layers on the basis of the number of symbols for each layer.
Abstract:
Disclosed is a channel estimation and equalization method and system. The method inserts a pilot signal in the time domain into a guard interval, uses a hard decision signal in the frequency domain to estimate a frequency response of the channel, and equalizes a radio channel distortion through the estimated channel value.
Abstract:
Disclosed is a channel estimation and equalization method and system. The method inserts a pilot signal in the time domain into a guard interval, uses a hard decision signal in the frequency domain to estimate a frequency response of the channel, and equalizes a radio channel distortion through the estimated channel value.
Abstract:
A repeater converts a frequency of a received signal based on a local oscillating frequency and transmits a transmitting signal of a frequency that is different from the frequency of the received signal. Here, the local oscillating frequency includes a local oscillating error that may be different in a plurality of repeaters. Accordingly, the repeater cancels the local oscillating frequency error itself in a frequency conversion so that transmitting frequencies between the plurality of repeaters may be identical.
Abstract:
The present invention relates to a transmission method, a transmission apparatus, a reception method, and a reception apparatus of a digital broadcasting signal that can add frame header information to a front portion of a transmission frame in a transmission system for digital broadcasting to thereby determine a different transmission mode, modulation level, hierarchical modulation, error correction code, and the like for each temporally different transmission frame, and a transmission frame structure thereof. The transmission frame structure includes a frame header containing multiplexing information of the transmission frame, and a frame body containing data information associated with a service provided by the transmission frame. Also, the frame header may include a frame synchronization signal unit including synchronization signal information for extracting a start position of the transmission frame and a frame information unit including multiplexing information of data contained in the transmission frame. The multiplexing information denotes information associated with a transmission mode, a modulation level, a hierarchical modulation, and an error correction code of the data contained in the transmission frame.
Abstract:
Es werden ein Verfahren und ein System bereitgestellt, wodurch ein Rundfunksystem einen Datenübertragungsblock erzeugt, der eine Notfallmeldung enthält. Das Verfahren zur Erzeugung eines Datenübertragungsblocks umfasst: Empfangen einer CAP-Meldung von Notfallfrühanalyseinformationen von einem Notfallfrühwarnsystem, Extrahieren von Notfallinformationen aus der CAP-Meldung und Paketieren der extrahierten Notfallinformationen; Erzeugen von mindestens einer Nutzlast auf Basis der paketierten Notfallinformationen; und Erzeugen eines Datenübertragungsblocks durch Platzieren eines Paketdatenkopfes für jede Nutzlast vor jeder Nutzlast, wobei der Datenübertragungsblock durch ein Rundfunksystem ausgestrahlt wird.
Abstract:
La présente invention concerne un procédé et un dispositif de transmission de signaux de données à l'aide d'antennes multiples (250, 670). Le procédé de transmission de signaux de données consiste à : exécuter un processus de diversité sur un premier signal de données codé et modulé ; exécuter un processus de diversité sur un second signal de données codé et modulé ; coupler l'un avec l'autre le premier signal de données ayant été soumis au processus de diversité et le second signal de données ayant été soumis au processus de diversité ; et transmettre via les antennes multiples (250, 670) les premier et second signaux de données couplés. Ici, le processus de diversité comporte un processus d'attribution du premier signal de données et du second signal de données aux antennes des antennes multiples (250, 670) afin d'avoir la diversité.
Abstract:
La présente invention concerne un dispositif de transmission de données de grand volume (100) comprenant une unité de génération de signal de radiodiffusion normal (110) générant un signal de radiodiffusion normal, une unité de génération de données de grand volume (120) générant des données de grand volume et d'informations de données de grand volume et une unité de recherche de canal (130) recherchant un canal libre ayant une force de fréquence qui interfère le moins possible avec le signal de radiodiffusion normal et générant des informations de canal libre ; et un dispositif de réception de données de grand volume (200) comprenant une unité de détection d'informations de données de grand volume et de canal (210) recevant un signal de radiodiffusion normal et identifiant le fait que le signal de radiodiffusion normal reçu contient des informations de canal libre et des informations de données de grand volume.
Abstract:
The transmitter has a service data generating unit (110) including a metadata generating unit (111) to generate metadata for a received message, a service packet generating unit (112) to generate service packets, and a packet header generating unit (113) to generate packet headers. A transmission data generating unit (120) generates transmission data, where a spectrum spreading code is inserted in a predetermined service data. A modulation unit (131) modulates the transmission data, and a signal synthesizing unit (133) synthesizes a diffusion signal with the modulated transmission data. Independent claims are also included for the following: (1) a receiver for receiving additional data in a digital broadcasting system (2) a method for transmitting additional data in a digital broadcasting system (3) a method for receiving additional data in a digital broadcasting system.