| dc.description.abstract | This paper focused at communication systems when train moved.
The communication propagation was influenced by building
environment. The communlcation condition that used uplink
direction. Mobile station was placed inside the train where moved
with 500 Ion/hour velocity. The analysis was used consists of
Doppler effect, annosphertr, and building environment. The variation
conummication frequency was used consists of 2.6 GHz, 5 GHz, and
10 GHz. Diffraction mechanism caused building was used single knife
edge method. The result was showed SNR value from the
commun ication frequency variation, distance comparison between
LOS and NLOS, alteration adaptive modulation and coding (AMC),
and coverage area percentage. Modulation and Coding Scheme (MCS)
was used for AMC consists of QPSK, 16 QAM, and 64 QAM. Decreases
ofSNR value can be ocrured when communication distance for NLOS
condition farther then LOS condition. That distance became increases
because was obstructed with Wgh building. Changeable of AMC value
was caused propagation condition. The coverage area percen tage
when communlcation frequency that was used consists of2.6 GHz. 5
GHz, and 10 GHz was obtained 88.4%, 88.4%, and 81.7%. | en_US |
