08-08-2012, 10:10 AM
Multipath Effects Observed in Radio System
Multipath Effects.ppt (Size: 1.49 MB / Downloads: 34)
Introduction
Signal arrive at a given receiver travelling different path
due to obstacles and reflections.
Arrival may be direct or indirect
Fluctuation occur in signal due to multipath giving rise
to fading and delay spread.
This fading is also affected by the relative motion
between trasmitter and receiver according to doppler
effect.
Intersymbol Interference also occur.
Outage Probability
Complete loss of transmitted signal due to fading
Measures the quality of transmission in Radio
Channel
Occurs when received signal falls below certain
level
Higher in case for Rayleigh than Rician fading
Conclusion
Effect of Multipath on signal reception was shown through MATLAB simulation. It was demonstrated that the degrading effects of the Rician channel on the received signals are relatively smaller than those in the Rayleigh channel. The examined parameters included average received power level, rate of received signal fluctuations, outage probability, and Doppler shift. The dispersive characteristics of multipath fading channels have also been simulated by showing the effects of these types of channels on the pulses transmitted throughout them.