Howtosignalprocessing
- What is meant by multipath propagation?
- What causes multipath propagation?
- What is multipath in wireless communication?
- How multipath propagation affects signal quality?
What is meant by multipath propagation?
Multipath propagation, an inherent feature of a mobile communications channel, results in a received signal that is dispersed in time. Each path has its own delay and the time dispersion leads to a form of intersymbol interference. Delay spread is a measure of the multipath profile of a mobile communications channel.
What causes multipath propagation?
Causes of multipath include atmospheric ducting, ionospheric reflection and refraction, and reflection from water bodies and terrestrial objects such as mountains and buildings. When the same signal is received over more than one path, it can create interference and phase shifting of the signal.
What is multipath in wireless communication?
Multipath is the phenomenon of fluctuations in signal strength formed by incoherent combination of signals coming from different directions through reflection or scattering with the direct signal. These reflected or scattered signals have different amplitudes and phases compared to the one received directly.
How multipath propagation affects signal quality?
Multipath propagation can give rise to interference that can reduce the signal to noise ratio and reduce bit error rates for digital signals. One cause of a degradation of the signal quality is the multipath fading already described.
