Impact of location accuracy on concurrent transmission for cognitive ad hoc networks

Cognitive radio systems can coexist with a primary network in a scanning-free region, which can be dimensioned by location awareness. This coexistence of networks improves the system throughput and increases the efficient use of radio spectrum. However, the accuracy of traditional positioning systems affects the correct dimensioning of the concurrent transmission region. In this paper the impact of location accuracy on the concurrent transmission probability is determined. It is provided a new analytical model that allows to estimate the resulting secure region when the location uncertainty range is known. Computer simulations validate the proposed model and allow to predict the maximum allowable location uncertainty to ensure proper performance of the concurrent transmission scheme.