For the Rayleigh fading model, I want use four multipath components, each component has its delay and gain.
- Can the gain in $\textrm{dB}$ of any of the individual four components be positive value?
I can understand that it can be zero or maybe negative indicating reduction in its amplitude due to delay and effects of channel, but I can not understand how it can be positive.
- The overall signal resulting from the four components at the receiver may be with positive gain. This is reasonable, due to constructive addition of maybe inphase components, but how can a single component be with positive gain?