Impact of radio link parameters on the capacity of UHF and millimeter-wave indoor cellular systems

Abstract

Third-generation mobile and portable radio systems will require higher transmission rates than recent second-generation systems in order to provide users with access to multimedia services. The typical bandwidths of second-generation systems are generally such that, for indoor applications, multipath diversity can be exploited by code division multiple access (CDMA) schemes, but not by frequency division-time division multiple access (FD-TDMA) schemes. However, for the larger bandwidths of future third-generation systems, multipath diversity can also be exploited by means of FD-TDMA. This paper investigates the influence of such an increase in transmission rate and various other radio link parameters on the capacity of an indoor wireless FD-TDMA cellular system. System performance is assessed via an analytically rigorous and statistically relevant semi-analytical approach: using radio link performance results obtained as a function of small-scale signal variations and without any assumptions with respect to the distribution of interference, the overall average system outage rate and binary error rate are evaluated by considering large-scale signal variations over a hexagonal cellular layout. Results are expressed in terms of the relative variations of the required handoff threshold, path loss and shadowing characteristics, for different combinations of cellular reuse factor, transmission rate and number of diversity antennas at the receiver, both in the presence and absence of equalization.