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Cu 1: Knh truyn ca h thng di ng GSM 900MHz c c tnh sau: Cng sut [dB]-50-3-5-8-10 Tr hon truyn [s]00.20.51.62.35.0 1.Tnh RMS delay v mean excess delay ca knh truyn 2.Tnh maximum excess delay -10dB 3.Xc nh Coherence bandwidth ca knh truyn 4.Gi s cc thit b trong h thng di chuyn vi tc 50Km/h, xc nh thi gian knh truyn xem nh khng thay i Cu 2: 1.Nu iuch pha c chtlng BER tt nu /TS 0.1(lRMS delayspread), xc nh thi giannhnhtca1symboleTSvtcsymbollnnhtcthtruynquaknhvtuync power delay profile nh trong hnh v 0-30 dB-20 dB-10 dB0 dB( ) s ( )rP 5 10Outdoor 2.Xc nh coherence bandwidth 90% 3.Cn sdng dng iu chno nu tc dliul 144Kbps, nu khngs dngb cnbng ng truyn (equalizer) Cu 3: Mt thit b di ng di chuyn vi tc 80Km/hr c s dng thu tn hiu Rayleigh fading phng (flat Rayleigh fading signal) tn s 6GHz. 1.Xc nh s ln tn hiu thu tng ln hn mc RMS (positive-going zero crossing about RMS level) trong khong thi gian 5 giy 2.Tnh khong thi gian trung bnh tnh hiu thu thp hn gi tr RMS 20dB Cu 4: Cho Power Delay Profile Ac() = _c-:0.00001,u 2upsu clsc 1.Tnh mean excess delay 2.Tnh delay spread 3.Tnh tc symbol ti a knh truyn l flat fading