• Journal of the Korea Society of Computer and Information
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• v.13 no.3
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• pp.115-122
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• 2008

The terrestrial DMB receivers and their application products need many tests such as normal reception, reception state for the noisy environment, reception state changes due to the changes of output power of the DMB signal, and reception state of various environment. Therefore, the real-time simulation system of the terrestrial DMB broadcasting system is a necessity to the terrestrial DMB research institutions. manufacturers, and other related organizations. In the paper, we design the DMB simulation system, which generates the real-time streams of terrestrial DMB broadcast signals and simulates the real DMB broadcasting signals. The system consists of T-DMB signal generator with PCI interface and simulation software for various functional components of program. The study reveals that the implementation of software-based T-DMB simulation system is possible with low cost. Through various experiments, we evaluate the performance of the simulation system, and we provide the future directions of research.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.47 no.1
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• pp.19-24
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• 2010

This paper proposes a unified time-domain channel estimator (UTD-CE) for ubiquitous wireless broadband access based on orthogonal frequency division multiplexing (OFDM) systems. As a part of a software radio platform for ubiquitous services, the proposed UTD-CE can be exploited with the simply changeable parameters, pilot symbols and pilot subcarriers allocation, which are usually different according to the system specifications such as IEEE802.11x WiFI, IEEE802.16x WiMAX, DMB, Media FLO, DVB-H, etc. Given the pilot information, the channel frequency responses (CFRs) of data subcarriers will be analogously estimated by Wiener filtering and discrete Fourier transform (DFT)-based interpolation in the UTD-CE. Simulation results indicate that the proposed method significantly outperforms the conventional time-domain channel estimator when the pilot information is changed.