Deok-Hwan Lee

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In this paper we implemented a PL(Position Location) system to estimate the 3-dimensional position of a moving object in underwater environments. In this research, we made a vector equation from the TDOA (Time Difference Of Arrival) of the signals transmitted/received from the moving object and fixed sensors. Then by using the Newton algorithm the solution(More)
In this paper we have analyzed the performance of adapting beamforming techniques to the Ad-hoc communication between moving vehicles. For the analysis we measured the wireless channel characteristics while moving in high speeds with two vehicles, a transmitter and a receiver. After analyzing the measurement data we found out that the effect of fading can(More)
In this paper, we have applied diversity technologies to the IEEE 802.11g to use the IEEE802.11g in moving channel environments. After analyzing the measurement data, it is shown that the diversity gain is 14dB at the probability of 1%. The reliable communication range is 63m when transmitting power is 10dBm, while the range increases to 163m when the(More)
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