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Characterisation of conference room environment in the 60 GHz band
Amar Al-jzari*, S. Salous
Department of Engineering, Durham University, Durham, DH1 3LE UK
amar.a.al-jzari@durham.ac.uk*
Millimeter wave (mmWave) communication is viewed as a key technology for the 5G
wireless communication systems. The 60 GHz bands has been pointed as potential
candidates for the short-range indoor scenarios due to availability of 5-7 GHz unlicensed
bands that can be exploited to achieve high data rate transmission throughputs.
This paper presents the results of wideband channel measurements conducted at
Durham University in various conference room environments. The measurements were
performed with 6 GHz BW at V-band in the frequency range of (59.6 - 65.6 GHz) with sweep
rate of 1.22 kHz using Frequency Modulated Continuous Wave (FMCW) based channel
Sounder. In each measured environment, the Tx location was placed at the corner while the
Rx was moved onto predefined location. The Tx and Rx were also set at different height to
emulate typical WLAN network environment. The rotated directional antenna-based method
has been conducted in order to investigate the angular variation of the wideband channel and
to recover the Angle of Departure (AoD) and the Angle of Arrival (AoA) statistic. For measuring
AoD, the Rx was fixed while the Tx was rotated with a step size of 15 degrees in azimuth plane
to cover the full rotation. For AoA, the Tx was fixed while the Rx was rotated in steps of 15o in
azimuth plane. Thus, 24 data files were recorded at each location corresponding to the full
azimuthal coverage. At each angular rotation the data were recoded for two seconds duration
with 40 MHz sampling rate ADC. Horn antenna with typical gain of 20 dBi and omni-directional
antenna were used in these measurement campaigns. The data were analysed with 2 GHz
BW and different multipath component parameters (MPCs) such as Power Delay Profile
(PDP), Power Angle Profile (PAP), Root Mean Square (RMS) delay spread (DS), K-factor,
AoA, AoD and Angular Spread (AS), have been estimated and compared in order to
characterize the measured channel. The produced results from the channel measurements
observed, in Line-of-Sight (LOS) conditions, the average delay spread increases when the Tx
and Rx antenna beams are not aligned. The presented results also indicate the LOS locations
were found to have smaller RMS DS than Non Line-of-Sight (NLOS) locations due to less
obstructions. The angular dispersion analysis reveals the highest angular spread occurs due
to the large number of reflectors and scatterers. Fig.1 displays an example of the relative PDP
at one location, in the meeting room environment versus the rotation angle at the Tx side.Fig.2
shows an example of the measured relative PDP at one location, in the seminar room
environment versus the rotation angle at the Rx side for LOS and NLOS scenarios.
(b)
(a)
Fig.1. Relative power delay profile vs. azimuth angle of rotation in the meeting room environment.
Fig.2. Relative power delay profile vs. azimuth angle of rotation in the seminar room environment:
(a) LOS scenario, (b) NLOS scenario.
