Title :
Modelling frequency correlation of fast fading in frequency hopping GSM link simulations
Author :
Klingenbrunn, Thomas ; Mogensen, Preben
Author_Institution :
Center for Person Kommunikation, Aalborg Univ., Denmark
Abstract :
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
Keywords :
cellular radio; correlation theory; diversity reception; fading channels; frequency hop communication; indoor radio; multipath channels; radio links; simulation; FH-GSM systems; channel coherence bandwidth; fast fading; frequency correlation; frequency diversity gain; frequency hopping; frequency reuse factor; indoor environments; link simulations; low-speed mobiles; multipath fading; wideband channel; Bandwidth; Decoding; Diversity methods; Fading; Frequency diversity; GSM; Indoor environments; Narrowband; Performance gain; Wideband;
Conference_Titel :
Vehicular Technology Conference, 1999. VTC 1999 - Fall. IEEE VTS 50th
Conference_Location :
Amsterdam
Print_ISBN :
0-7803-5435-4
DOI :
10.1109/VETECF.1999.797368
