Adaptive Modulation and Coding (AMC) around Building Environment for MS Communication at The Train

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%.