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This letter presents the results of a measurements campaign carried out at 2050 MHz with the aim of characterizing the time dispersion of multipath propagation when the transmit and receive antennas are placed near and situated on rooftops or mounted on masts. The measurements were taken in four separate locations within the urban area of Madrid, Spain. From the measured data, the root mean square (RMS) value of the delay spread and the delay interval that characterize the time dispersion propagation of the environment under study are analyzed. An average power delay profile (PDP), representative of the time dispersion, is proposed so as to extrapolate these results to other similar environments. The results can be useful for the designer to develop, analyze, and choose the best echo canceller technique and evaluate its performance in terms of the radio channel time dispersion when iso-frequency repeaters are used to enhance the coverage area and capacity of mobile cellular systems, as it is the case of the evolving third-generation UMTS networks.Index Terms-Coverage area, iso-frequency repeaters, over-building propagation, time dispersion.

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In this paper, a characterization of the UWB mobile radio channel time dispersion is presented. The results provided were obtained from a measurement campaign carried out in a typical indoor office scenario in the band from 3.1 to 10.6 GHz. Time dispersion metrics as delay spread, coherence bandwidth, delay interval and delay window, in both line-of-sight (LOS) and non-line-of-sight (NLOS) conditions are provided.

In this paper, the influence of the frequency band on the Multiple-Input Multiple-Output (MIMO) channel capacity in an office environment is researched. This study is based on an extensive measurement campaign between 2 and 12 GHz in Line-Of-Sight (LOS) and Non-Line-Of-Sight (NLOS) conditions.