Opposite-sector uplink interference in broadband FWA networks in high-rise cities

A deterministic propagation model is used to simulate broadband radio propagation at 3.5 GHz for a fixed wireless access (FWA) network in a high-rise city environment, with linear antenna polarisation. It is shown that some rooftop locations are unsuitable positions for subscriber units (SUs), due to the existence of single- or multiple-bounce reflected rays causing uplink interference. Furthermore, it is shown that it is usually possible to find an SU position just a few metres away on the same rooftop that gives much lower uplink interference.