Two-way transmission quality in portable radio systems

The author gives results of a simulation study of the uplink and downlink transmission quality of portable-radio-based multiple access in a frequency-reuse radio system. In addition to shadow and Rayleigh fading, the positional variability of portable users, differences in uplink and downlink interference, and independence of multipath fading for the uplink and downlink are modeled. The study has shown that portable-radio-based multiple access can provide acceptable two-way transmission quality in an interference-limited environment. This assumes a simple and economical fixed-port configuration based on one TDM/TDMA (time-division multiplexing/time-division multiple-access) channel assigned to each port in a regular reuse pattern operating independently in terms of control and signal processing. It is shown that this approach provides a cost-effective design for the fixed radio port grid