Mobile indoor wide-band 1.8 GHz sounding: measurement-based time dispersion analysis

The results of a 1.8 GHz indoor wideband channel sounding survey in some typical environments, trying to account for pedestrian subscriber mobility, are presented. The sounding technique has been based on the classical frequency domain, with an optic link instead of coaxial cables providing an extended path range, up to 350 m. Three different scenarios have been analyzed. Complete small and large-scale time dispersion analysis have been derived from the impulse responses measured, like mean delay, rms delay spread, coherence bandwidth and its variations with mobility. From the whole analysis carried out, two main results are worth remarking upon: the power delay profile variation with distance providing a pictorial representation of the main scattering mechanisms of the environment; and the validation of a lower bound relation between the coherence bandwidth and the rms delay spread.