Rician factor effect
A strong LOS component, i.e. a high Rician factor, will always improve receiver performance. If $K$ denotes the Rician factor, i.e. the ratio between the power of the LOS component and the power of the other (scattered) components, then for $K\rightarrow\infty$ you have no multipath propagation at all and you get a simple AWGN channel. For $K=0$ you have a Rayleigh fading channel (with no LOS component).