Frequency-Dependence of Channel Delay Spread in an Outdoor Environment
Résumé
Millimeter-Wave (mmW) communication
systems, capable of achieving high data rates thanks to the
large bandwidth available in this frequency range, are a
promising 5G technology. Studies in this paper investigate
the radio propagation channel at 3, 17 and 60 GHz in an
Outdoor environment. Measurements were conducted
using a wideband channel sounder to derive channel delay
spread (DS). Results do not indicate a clear trend on the
behavior of the DS with regards to the frequency. This
disagrees in some way with the 3GPP TR 38.900 channel
model findings which support a clear decreasing trend of
this parameter as the frequency increases. At 60 GHz, the
channel DS was computed with and without compensation
of atmospheric oxygen absorption. It was found that this
phenomenon has minor impact on the measurement
results. Its compensation does not change the main
conclusions.