Abstract:
PURPOSE: A signal transceiving method for sync detection is provided to detect an AT-DMB signal by using a signal for frame sync detection in a receiving signal including a T-DMB signal and a AT-DMB signal. CONSTITUTION: A signal transmission device for frame sync detection receives an HP(High Priority) signal and a LP(Low Priority) signl(S501). The device perform an IFFT(Inverse Fast Fourier Transform) of a layer modulation signal(S502). The device detects a PRS(Phase Reference Symbol) signal of a converted time domain signal(S503). The device divides the time interval corresponding to the PRS signal into a plurality of sections(S504). The device transmits a receives of an AT_DMB as a frame sync detection signal(S506).
Abstract:
PURPOSE: A broadcasting signal transmitting/receiving apparatus and method thereof are provided to obtain receiving performance of a layer service in a section which an enhancement layer service does not exist. CONSTITUTION: A base layer(810) signal is generated by including a base layer symbol and a sub channel. An enhancement layer signal including an enhancement layer symbol is generated. The enhancement layer symbol is generated by a layer modulation index in a first sub channel. The base layer symbol is outputted in a second sub channel.
Abstract:
PURPOSE: An RF signal transceiving device is provided to use guide bands based on the frequency of consumption, to combine a server providing each block, and to provide a variable high definition service. CONSTITUTION: An RF signal generating method comprises as follows: a step of generating a first sub carrier block by using a subcarrier including a first symbol(S410), a step of diving a sub carrier included in a first sub carrier block(S420), a step of inserting the divided sub carrier into a guide band between a plurality of rearranged second sub carriers(S430). A second sub carrier block is generated by using a sub carrier including a second symbol.
Abstract:
PURPOSE: A method and an apparatus for an Internet protocol television service to switch a channel are provided to supply user convenience by selecting broadcasting contents of a maximum resolution in priority. CONSTITUTION: A channel switching request processor(510) requests channel switching into a network switch, and a broadcasting stream receiver(520) receives a broadcasting stream of a corresponding channel from a switch. A decoding processor(530) decodes broadcasting contents in priority, wherein the broadcasting contents corresponds to the maximum resolution among broadcasting streams. A broadcasting content transmitter(540) transmits the decoded broadcasting contents to a display device.
Abstract:
PURPOSE: A broadcasting receiving method for reducing the used amount of a communications channel and an apparatus thereof are provided to supply the broadcasting program to the user. CONSTITUTION: A program storing unit(420) stores a first broadcasting program transmitted from the broadcasting transmission unit at the arbitrary point of time. A controller(430) confirms the location of the arbitrary selection point while the first broadcasting program is broadcasted. The controller interlinks the first broadcasting program and the second broadcasting program to the arbitrary selection point. A display unit(440) displays the first broadcasting program or the second broadcasting program.
Abstract:
직교 부호를 이용한 디지털 데이터 전송 장치가 개시된다. 직교 부호를 이용한 디지털 데이터 전송 장치는 부호화된 복수개의 비트스트림을 포함하는 하나 이상의 프레임으로 구성된 미니슬롯을 시간 구간에 따라 분할하여 형성하는 프레임기, 전송하고자 하는 신호 배열에 따라 상기 복수개의 비트스트림을 각각 변조 심볼로 맵핑하는 심볼 맵퍼 및 상기 심볼 맵퍼로부터 동위성분과 직교성분으로 구분되어 출력된 상기 각 변조 심볼에 대한 신호를 시간 영역으로 확산시키는 확산기를 포함한다. S-CDM/TDMA, 미니슬롯, 확산 부호, 확산 구간, 변조 심볼, 프레임기, 심볼 맵퍼, 확산기(spreader), 교삽(interleaving)
Abstract:
본 발명은 케이블 네트워크 동적 멀티캐스팅 세션에서의 보안 제어 방법에 관한 것으로, 더욱 상세하게는 DOCSIS 3.0 네트워크와 같은 케이블 네트워크 동적 멀티캐스트 세션에서의 순방향 및 역방향의 보안을 제어하기 위한 방법에 관한 것이다. 본 발명은 케이블 네트워크상의 동적 멀티캐스트 세션에서의 보안 제어 방법에 있어서, 제1 DSID 및 제1 SAID가 할당되고, 제1 케이블 모뎀이 가입된 멀티캐스트 그룹을 유지하는 단계; 제2 케이블 모뎀으로부터 가입멀티캐스트세션 메시지를 수신하는 단계; 상기 가입멀티캐스트세션 메시지에 대응하여 상기 제2 케이블 모뎀으로 멀티캐스트 파라미터 변경을 위한 DBC 메시지를 교환하는 단계; 및 상기 제1 DSID에 대응하는 제1 트래픽 암호화 키(TEK)를 제2 트래픽 암호화 키로 업데이트하는 단계를 포함하는 것을 특징으로 하는 보안 제어 방법을 제공한다. DOCSIS, 케이블 모뎀, 케이블 모뎀 단말 시스템, 동적 멀티캐스트 세션, 보안
Abstract:
A cable network system and a method for controlling security in a cable network dynamic multicast session are provided to transmit a DBC message to a cable modem terminal system and update a traffic encryption key after a cable modem transmits a leave multicast session message, thereby controlling forward security. The first DSID(Downstream Service ID) and the first SAID(Security Association ID) are allocated. A multicast group to which the first and second cable modems are subscribed is maintained(S410). A leave multicast session message is received from the second cable modem(S420). A DBC(Dynamic Bonding Change) message for changing a multicast parameter is exchanged with the second cable modem(S430). The first traffic encryption key corresponding to the first DSID is updated to the second traffic encryption key(S440).
Abstract:
A cable modem for compensating for the frequency offset and phase offset and a method for operating the same are provided to compensate for the frequency offset simply and efficiently. A signal receiving unit receives an input signal in which a preamble including a plurality of repeated sections is included through a cable network. A frequency offset estimator(410) estimates the frequency offset by using the identity of sequences included in each repeated section. According to the estimated frequency offset, a compensation(430) compensates for the input signal. The preamble comprises the first repeated section and the second repeated section. According to the consistency degree of sequences included in the first and second repeated section, the frequency offset estimator estimates the frequency offset.
Abstract:
A device and a method for receiving a broadcasting broadcast service continuously in an MFN(Multi Frequency Network) broadcasting network are provided to receive the continuous broadcasting service stably during moving by reducing a channel search time based on channel information classified into each town. A position information receiver(20) receives location information. A channel information storage(50) comprises the location ready for receiving channel information. A broadcasting receiver(70) obtains available channel corresponding to the location information from the channel information storage and receives a broadcast service through the obtained.