Narrowband propagation characteristics at 2.45 and 18 GHz in underground mining environments

We present the propagation characteristics at 2.45 and 18 GHz resulting from the statistical analysis of a narrowband measurement campaign in an underground mining environment. Parameters, such as the amplitude distribution of the envelope, level crossing rate, average fade duration and coherence time of the channel, have been examined. An analysis by linear regression has also been used to study the variations of the received power according to the transmitter-receiver distance.