Young-Kwon Hahm

Development of a remultiplexer for digital multimedia broadcasting

This paper introduces the development of a remultiplexer which multiplexes the MPEG-4 stream into the digital multimedia broadcasting transmission signal. The remultiplexer also has additional channel coding functions which are essential for mobile reception of moving pictures through the digital multimedia broadcasting signal.

Array antenna schemes with different polarization for reducing the fast fading in a microcell

This paper proposes array antenna schemes and combining schemes for polarization diversity to reduce the fluctuating range of fading signals in a microcellular environment. To analyze the propagation characteristics of proposed schemes, the spatial correlation coefficient of the received signal, fading signal distribution, level crossing rate and the average fade duration are investigated. The simulations of the propagation in a microcell are carried out by using a ray tracing program. The results of comparison between simulated and measured data are shown to verify the accuracy of the simulated results.