Modelling frequency correlation of fast fading in frequency hopping GSM link simulations
T. Klingenbrunn, Preben Mogensen · 1999
The spaced frequency correlation affects the frequency diversity gain in frequency hopping (FH) GSM systems. However, GSM link level simulations have not taken this into account. In this paper, a method for generation of correlated multipath fading is described, taking the spaced frequency correlation into account. The method can be used to emulate frequency hopping in a wideband channel, and is usable with both network and link level simulations. FH-GSM link simulations with low-speed mobiles exhibit a loss in frequency diversity gain due to the spaced frequency correlation. Two factors influence this loss: the frequency reuse factor and the channel coherence bandwidth. In networks with frequency reuse 1, the loss in diversity gain is up to 0.5 dB in outdoor urban environments and up to 4 dB in indoor environments.