Abstract:
본 명세서는 무선 통신 시스템에서 FTN(Faster Than Nyquist) 펄스(pulse) 성형을 이용한 신호 전송 장치의 신호 송신 방법 및 장치에 관한 것이다. 이러한 본 명세서는 전송하고자 하는 비트 스트림(bit stream)을 변조하는 단계, 상기 FTN 펄스 성형을 위한 파라미터를 결정하는 단계, 상기 파라미터를 기반으로 상기 FTN 펄스를 생성하는 단계 및 상기 생성된 FTN 펄스를 신호 수신 장치로 전송하는 단계를 포함하되, 상기 파라미터는 상기 신호 수신 장치의 채널 수신 상태를 기반으로 결정되는 것을 특징으로 하는 신호 송신 방법을 제공한다.
Abstract:
The present invention relates to an apparatus and a method for providing emergency information and supplementary information. A terminal for providing emergency information and supplementary information includes an EWAS processor to receive an EWAS signal, to determine whether an EWC is included in the EWAS signal, and to decode the EWC for acquiring the emergency information and the supplementary information; a region based service unit to decode the emergency information and the supplementary information to acquire service information including at least one service item, and to express an item label, an item description, broadcasting link information, and communications link information on the service item; and a terminal base function unit accessing a Wi-Fi network or a mobile communications network to perform communications or accessing a T-DMB network to receive broadcasting according to selection of a user, and to control web browsing environment for acquiring additional information through Internet access provided from the mobile communications network or Wi-Fi network. An automatic recognition service and a region based service are used to the highest degree as an advantage of an automatic recognition emergency broadcasting service and a low data transmission rate may be compensated.
Abstract:
본 발명은 시간에 따라 채널 환경이 변화되는 디지털 방송 시스템에서 데이터를 블록 단위로 반복 전송하고 수신단에서 수신 품질 측정을 통해 우수한 수신 블록을 선택 결합하여 수신 품질을 향상시키기 위한 반복 송신 장치 및 수신 장치에 관한 것으로, 본 발명에 따른 송신 장치는, 압축된 데이터 스트림을 채널 부호화하는 채널 코딩수단; 상기 채널 코딩수단에 의해 채널 부호화된 데이터 스트림을 복수의 블록 단위로 구분하여 복수의 데이터 블록을 생성하고, 상기 복수의 데이터 블록을 다중화하여 제1 반복 전송 구간에 출력하고, 상기 복수의 데이터 블록과 동일한 복사된 데이터 블록을 제2 반복 전송 구간에 출력하여 동일 데이터 블록에 대해 임의의 자연수 N회만큼 반복 출력하는 반복 및 다중화수단; 및 상기 반복 및 다중화수단으로부터 출력된 다중화된 데이터 블록들을 무선 주파수 신호로 변조하여 송출하는 변조수단을 포함하되, 상기 반복 및 다중화수단은, 상기 동일 데이터 블록들에 대해 코히어런스 시간과 동일하거나 긴 시간 간격을 가지고 반복 전송한다.
Abstract:
An apparatus and a method for providing a digital broadcast signal are provided. The apparatus for providing a digital broadcast signal comprises a disaster broadcast unit which detects a first disaster message signal from a terrestrial DMB signal, and generates a second disaster message signal including a disaster broadcast activation data for emergency alert service for a radio shadow area based on a first field value of the first disaster message signal; and a broadcast signal relay unit which controls transmission of the second disaster massage signal transmitted from the disaster broadcast unit.
Abstract:
The present invention relates to a broadcasting transmission apparatus. Disclosed in the present specification is the broadcasting transmission apparatus which comprises an ATSC signal generation unit to transmit an ATSC signal in accordance with ATSC transmission standards; a low-speed data signal generation unit which has the same frequency range as that of the ATSC signal, and transmits at least one narrow-band signal located in a null frequency domain of an NTSC removal filter; a coupling unit to couple the ATSC signal to the at least one narrow-band signal; and an RF transmission unit to transmit the signal, coupled by the coupling unit, as an RF signal.
Abstract:
PURPOSE: A soft-decision bit detection and demodulation method is provided to secure performance by using a simple method while maintaining a conventional modulation/demodulation system. CONSTITUTION: A soft-decision bit detection and demodulation method includes the following steps: a step of securing the I-channel value and Q-channel value of a received transmission signal; a step of securing initial soft-decision bit values for a first bit and a second bit by using the secured I-channel value and Q-channel value; a step of cyclically securing initial soft-decision bit values for a third bit through an Mth bit by using the initial soft-decision bit values for the first and second bits; and a step of securing final soft-decision bit values by multiplying the secured initial soft-decision bit values by a gain which is calculated based on a reliability adjustment value for the initial soft-decision bit values. [Reference numerals] (101) Error correction encoder; (102) M-ary modulator (symbol phase); (103) M-ary demodulator (bit-specific soft-decision detection); (104) Iterative decoder; (AA) Transmission system; (BB,FF) Binary signal; (CC) Log_2M bit; (DD) Channel fading; (EE) Reception system; (GG) Log_2M soft-decision value; (HH) Channel noise
Abstract:
PURPOSE: A device for transmitting and receiving additional data in a digital broadcast system and a method thereof are provided to transmit and receive the additional data which guarantees excellent receiving performance in a low SNR(Signal-to-Noise Ratio) and multi-path environment. CONSTITUTION: An IF(Intermediate Frequency) broadcast signal generation unit(110) generates a broadcast signal of an IF band through FEC(Forward Error Correction) and modulation of input broadcast data. An IF additional signal generation unit(120) generates additional input data as an additional signal of the IF band by using DSSS(Direct Sequence Spread Spectrum). An RF(Radio Frequency) upward conversion unit(150) converts a combination signal of the additional signal and the broadcast signal, which is generated in a signal combination unit(140), into an RF band. A transmission unit(160) transmits the combination signal of the generated RF band. [Reference numerals] (110) IF broadcast signal generation unit; (120) IF additional signal generation unit; (130) Average power control unit; (150) RF upward conversion unit; (160) Transmission unit; (AA) Broadcast data; (BB) Additional data