• Proceedings of the Korean Society of Broadcast Engineers Conference
• /
• 2016.06a
• /
• pp.240-241
• /
• 2016

본 논문은 FTN(faster-than-Nyquist) 신호가 적용된 DVB-T2 시스템의 동기 알고리듬에 미치는 영향에 대하여 분석하였다. 파일럿 기반의 동기 알고리듬은 FTN 신호의 간섭 영향으로 인하여 동기 성능의 열화가 발생한다. 기존의 DVB-T2 시스템을 기반으로 하여 FTN 변수에 따른 성능의 변화를 실험으로 분석하고 SUI 채널 환경에서의 성능을 분석하였다.

• Journal of information and communication convergence engineering
• /
• v.6 no.2
• /
• pp.169-171
• /
• 2008

An internal antenna for small mobile systems is proposed to support the DVB-H system. It consists of two antenna elements, which are a folded planar monopole for DVB-H and PIFA for GSM/DCS/PCS, and a meander line and RF cable are used to increase the ground plane. Experimental results of the antenna are presented.

• Proceedings of the Korean Society of Marine Engineers Conference
• /
• 2005.11a
• /
• pp.61-62
• /
• 2005

In this paper, we investigate the encoding and decoding method of turbo codes that offer a variety of coding rates from 1/3 to 6/7 in Digital Video Broadcast Return Channel via Satellite (DVB-RCS) standard to provide ship-internet service with high-quality.

• Proceedings of the KAIS Fall Conference
• /
• 2006.05a
• /
• pp.506-509
• /
• 2006

이동 휴대 수신을 목적으로 한 멀티미디어. 서비스 시대가 다가오고 있다. 국내에서는 지상파 및 위성 DMB방송이 이제 막 서비스를 시작하고 있고, 유럽에서도 DVB-H라는 휴대수신용 멀티미디어 방송 기술을 표준화 하고 있다. 이에 본 논문에서는 이동 휴대형 멀티미디어 서비스에서 적용될 수 있는 기술인 DVB-H 기술에 대하여 논하고자 한다.

• Proceedings of the IEEK Conference
• /
• 2006.06a
• /
• pp.393-394
• /
• 2006

This paper lists various error resilience tools and analyzes performance in IP Datacast over DVB-H systems and schemes are proposed. Experiments shows that, in DVB-H environment, encoding with macroblock line intra update can achieve the best error correction ability, because this tool can make full use of spatial correlation for intra prediction and reduce the requirement of bit rate.

• Proceedings of the IEEK Conference
• /
• 2006.06a
• /
• pp.231-232
• /
• 2006

In this paper, we developed a simulator for the DVB-T which can predict the performance of the system. In the simulator, the transmitter and receiver are implemented based on the European standard of the DVB-T. The BER performance is measured for various QAM levels and coding rates in Rician channels with several mobile speeds.

• ETRI Journal
• /
• v.34 no.3
• /
• pp.454-457
• /
• 2012

A miniaturized planar digital video broadcasting terrestrial (DVB-T) antenna, which is composed of a patterned helical line, an open stub, and an impedance matching circuit on an FR4 (${\varepsilon}_r$=4.4) substrate for portable media player applications, is presented in this letter. The antenna has monopole-like, omni-directional radiation characteristics and a wide impedance bandwidth (VSWR<3) in the DVB-T band from 174 MHz to 230 MHz at the VHF band.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.30 no.11A
• /
• pp.1081-1091
• /
• 2005

Unlike conventional DVB-T transmission with the streaming method, DVB-H system based on the IPDC(IP Data Casting) method uses Time-slicing scheme to achieve the maximization of portability by reducing the power consumption of a receiver. To enhance the power efficiency of the receiver, Time-slicing scheme controls the receiver operation to perform only for corresponding burst in specific time slot. The additional power saving can also be achieved by reducing the required time for synchronization. In this paper, we propose a fast scattered pilot synchronization algorithm, which detects the pilot pattern of currently received OFDM symbol. The proposed scheme is based on the correlation between the adjacent subcarriers of potential scattered pilot position in two consecutively received OFDM symbols. Therefore, it can reduce the time for the scattered pilot synchronization within two symbols as com-pared with the conventional method used for DVB-T. And the proposed algorithm has better performance than the two schemes proposed by Nokia for DVB-H and the method using correlation with reference signal. Extensive com-puter simulation is performed based on ETSI EN300 744 ETSI and performance results show that the proposed algorithm has more efficient and stable operation than the conventional schemes.

• Journal of Broadcast Engineering
• /
• v.15 no.6
• /
• pp.749-756
• /
• 2010

The signal space diversity is one of the promising transmission techniques in next generation mobile TV service. However, DVB-T2 does not consider the multiple antennas (MIMO) so that the cyclic Q-delay method, a component interleaver in DVB-T2, causes a critical issue in detecting symbols at the receiver side by increasing the inter-symbol dependency. To solve this problem, the component-swapping technique is proposed, which limits the inter-symbol dependency in order to reduce detection complexity. In this paper, the achievable gain of a component-swapping technique combined with 16K LDPC code defined in DVB-T2 is evaluated by computer simulations. From the results, the gain is confirmed in terms of BER and receive complexity compared to legacy component interleaver methods.

• Journal of the Institute of Electronics and Information Engineers
• /
• v.50 no.9
• /
• pp.3-11
• /
• 2013

Recently, a plenty of researches have been conducted using the massively parallel processing of GPU for the implementation of communication system. In this paper, we tried to reduce software simulation time applying GPU with sliding block method to Viterbi decoder in DVB-T system which is one of European DTV standards. First of all, we implement DVB-T system by CPU and estimate cost time whereby the system processes one OFDM symbol. Secondly, we implement Viterbi decoder by software using NVIDIA's massive GPU processor. In our work, stream process method is applied to reduce the overhead for data transfer between CPU and GPU, as well as coalescing method to lower the global memory access time. In addition, data structure design method is used to maximize the shared memory usage. Consequently, our proposed method is approximately 11 times faster in 2K mode and 60 times faster in 8K mode for the process in Viterbi decoder.