This paper presents the results obtained from 60 GHz propagation measurement campaigns in indoor environments. These measurements are performed in the frequency domain and are based on the use of a vector network analyzer (VNA). The analysis of the results makes it possible to characterize the propagation channel. In first measurement campaign, we show the influence of different types of antennas on the path loss characteristics in a hallway, while in the second campaign results highlight the effect of the type of antenna of the access point (AP) and its position on the angular impulse response of the channel inside a meeting room. All of these results are intended to lead to rules for the deployment of wireless high-speed local and personal area networks (WLANs/WPANs).
This paper presents path loss models based on extensive propagation measurements performed at 2.4 GHz and 5.8 GHz in a modern indoor office layout typical of small and medium-sized businesses, namely: the open-space office. Measurements were conducted using a vector network analyzer which covers frequencies up to 6 GHz, and ultra-wideband omnidirectional verticallypolarized antennas. The data were recorded under the same conditions and with the same antennas for both 2.4 GHz and 5.8 GHz. 940 transmitter-receiver location and height combinations were studied, as well as antenna configurations in both line-of-sight and non-line-of-sight. A second measurement campaign was conducted to quantify the variation amount on the expected power loss in realistic scenarios that include the effect of people movement and showed that the mean path loss further increases by up to 4 dB due to people's presence and movement, with variations up to 9 dB when the activity level is high.
In this work, we present a propagation measurements campaign conducted at 60 GHz in a typical indoor office environment. These measurements can be useful in order to exploit multipaths, aiming to maintain the quality of the communication in the case of blocking the direct path due to an obstruction created by people, furniture or other obstacles. The measurements were realized on 2 GHz bandwidth using a vector network analyzer (VNA). At the receiving side being always visible by the transmitter, a rotation by 6 • over 360 • is performed. The obtained results allow to compute different channel parameters such as: path loss, RMS delay spread and coherence bandwidth. In our study, we consider for each receiver position two situations: the direct orientation and the best indirect orientation of the receiving antenna. These results show that the path loss of the best indirect orientation increases up to 18 dB compared to the direct orientation. Indeed, some positions may be more affected than others in the case of blocking the direct orientation. The obtained results will be useful both to design the new broadband communication systems and to deploy wireless local and personal area networks (WLAN/WPAN) operating in the millimeter-wave (mmWave) bands. Index Terms-60 GHz, indoor radio channel, measurements, VNA, path loss, RMS delay spread, coherence bandwidth, angle of arrival
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