• Proceedings of the IEEK Conference
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• 2005.11a
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• pp.131-134
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• 2005

Recently, RF systems have rapidly grown with the extension of the mobile communication service The mobile service companies are providing the satellite broadcasting and common usage are expected. Coinciding with current trend, the development of improved satellite DMB (Digital Multimedia Broadcasting) tuner is required. To improve the receiving sensitivity under the poor communication circumstance, It is necessary to design the LNA (Low Noise Amplifier) with outstanding low noise characteristic and the BPF (Bandpass Filter) to transmit only desired signal without distortion and loss. Besides high reliability, the miniaturization and lightweight are required for design of mobile terminals. In this study, we designed and fabricated DMB SIR-type BPF which operates at 2642 MHz and is embedded in the substrate using LTCC. As a result, we obtained the passband insertion loss of 2.4 dB and the passband ripple of 0.08 dB. So this DMB SIR-type BPF is applicable to RF module of a satellite DMB tuner.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.31 no.5A
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• pp.509-516
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• 2006

Satellite-Digital Multimedia Broadcasting(S-DMB) systems are single frequency networks which consist of a satellite and gap fillers. Though gap fillers are required to extend the coverage to NLOS(Non Line-of-Sight) area, the receiver performance can be degraded with a limited number of fingers due to the increased number of multi-paths. The paper proposes to use frequency domain equalizer(FDE) instead of conventional Rake receiver, where the guard interval is not considered in order to minimize the impact on the current S-DMB systems. Through a campaign of simulations, it is found that the proposed FDE is less sensitive to the number of gap fillers compared to the conventional Rake receiver, and can achieve a greater channel capacity in most channel environments.

• Proceedings of the KIEE Conference
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• 2007.04a
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• pp.289-291
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• 2007

The Digital Multimedia Broadcasting(DMB) system is developed to offer high quality audio-visual multimedia contents to the uses by the various portable terminals in the mobile environment. Integrated complex reception platform is required to receive multimedia broadcasting services transmitted from various transmission media. In this paper, we present the design and implementation technic for providing the both of terrestrial and satellite DMB services simultaneously using the same hardware platform. The implemented complex receiving terminal to accommodate these DMB services simultaneously need composed of it RF module. it baseband module, it complex control module and the complex de-multiplexer module. The complex control module is designed using uClinux operating system. The complex de-multiplexer, which perform the functions of the address decoder and each DMB stream de-multiplexer, is implemented. with FPGA device. The implemented platform is tested in a real environment and its performance is satisfied with required performance criteria.

• Proceedings of the IEEK Conference
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• 2006.06a
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• pp.75-76
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• 2006

A new broadcasting standard for Digital Multimedia Broadcasting(DMB) has been announced in Korea to provide audio, video, and data broadcasting services. There exist two types of DMB; terrestrial DMB and satellite DMB. And in order to service DMB on the single system, the integration of RF module is required. In this paper, we describe an integrated RF tuner module that can receive T-DMB and S-DMB at the same time, which includes an L-band down-converter, a Band III tuner, and a S-DMB tuner.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.11 no.12
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• pp.2217-2226
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• 2007

In this paper, we propose a microstrip antenna with sufficient impedance bandwidths and gains for the 2.65GHz antenna which can be used in the satellite digital multimedia broadcasting. The prposed 2.65GHz satellite DMB bandwidth microstrip antenna is implemented on a substrate, which is small enough to be installed in practical mobile phones, and described simulation feature using by CST MicroWave Studio program. And also, we measured the antenna performance between the proposed antenna and the commercial antenna. From the analysis, it was found that the radiation pattern of proposed antenna is superior to the commercial antenna and an acceptable frequency band is more wider than the existing products.

• Satellite Communications and Space Industry
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• v.12 no.1 s.27
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• pp.91-95
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• 2004

• Satellite Communications and Space Industry
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• v.13 no.1 s.28
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• pp.65-71
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• 2006

• Satellite Communications and Space Industry
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• v.11 no.1 s.26
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• pp.44-49
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• 2003

• The Journal of Korean Institute of Communications and Information Sciences
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• v.30 no.5A
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• pp.397-401
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• 2005

A different alternative method for simulating bit error rate(BER) performance of Satellite Digital Multimedia Broadcasting(DMB) in tunnel environments is presented. The method based on a channel model obtained by ray-tracing is able to support BER estimation over the channel presents arbitrary statistics that are difficult to fit to an analytic expression. The BER performance for System E over the tunnel fading channel that obtained by ray-tracing is predicted by the monte-carlo method. It can be observed that the BER performance for a straight tunnel channel is better than that for a line-of-sight(LOS) area in curved tunnel. Also, the BER performance for LOS areas in a curved tunnel outperforms that for non-line-of-sight(NLOS) areas in a curved tunnel. The BER performances for straight, curved LOS and curved NLOS tunnel channels are better than that for a Rayleigh channel(K=0) and less than that for a Rician channel with K=3. Moreover, for BER=10-3, it can be seen that there is approximately a $1{\sim}1.5\;dB$ difference between those three types of tunnel channels and a Rayleigh channel.

• Electronics and Telecommunications Trends
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• v.19 no.2 s.86
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• pp.101-110
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• 2004

본 연구에서는 통신. 방송 융합의 개념과 통신. 방송 융합 서비스의 현황을 알아보고 통신. 방송 융합 서비스관련 국내외의 분류 기준을 살펴보고자 한다. 또한 대표적인 통신. 방송 융합형 서비스인 위성 DMB 서비스를 실제로 연구에 적용하여, 국내 위성 DMB 서비스 관련 정책환경 분석과 더불어 위성 DMB 서비스와 유사서비스와의 비교를 통해 통신. 방송 융합서비스가 보유하고 있는 차별적 성격을 도출하는 한편, 그 시사점을 제시하고자 한다.