written 8.2 years ago by | • modified 8.2 years ago |
Mumbai University > Electronics and telecommunication engineering> Sem 7 > mobile communication
Marks: 5M
Year: Dec 2015
written 8.2 years ago by | • modified 8.2 years ago |
Mumbai University > Electronics and telecommunication engineering> Sem 7 > mobile communication
Marks: 5M
Year: Dec 2015
written 8.2 years ago by | • modified 8.2 years ago |
In frequency domain signal distortion due to fast fading increases with increasing Doppler spread relative to the bandwidth of the transmitted signal. Therefore, a signal undergoes fast fading if
TS>TCandBS<BD
Where: TC and TS = coherence time BS and BD = Doppler spread.
In the frequency domain, this implies that the Doppler spread of the channel is much less than the bandwidth of the baseband signals. Therefore, a signal undergoes slow fading if
TS<<TDandBS>>BD
Where: TC and TS = coherence time BS and BD = Doppler spread.