How does spatial diversity work?
Spatial diversity is based on the fact that if the signal is received on two antennas separated from each other by more than a wavelength or so, the fades will not be correlated. Fades on one antenna will not be accompanied by simultaneous fades on the other antenna. In this case both receivers shown in Figure 2 could be tuned to the same frequency. Another form of spatial diversity can be obtained with a single receiver by simply using a longwire antenna of more than one wavelength, The theory here is that the large physical size of the antenna means that somewhere on the wire the multipath waves are not canceling so there will always be an output, Longwire antennas, mounted high and in the clear, will exhibit gain and directivity at low elevation angles, Because high angle multipath signals are discriminated against by such an antenna, fading effects are reduced compared to a half wave dipole or smaller antenna. What is polarization diversity? Polarization diversity allows the receiv
