Wideband MIMO Channel Sounder for Radio Measurements in the 60 GHz Band

Abstract

Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. In this paper we present the architecture of the sounder and demonstrate its performance from back to back tests and from measurements of rms delay spread, path loss and MIMO capacity in an indoor and an outdoor environment. For 20 dB threshold, the rms delay spread for 90% of the measured locations is estimated at 1.4 ns and 1 ns for the indoor and outdoor environments, respectively. MIMO capacity close to the iid channel capacity for 2 by 2 configuration is achieved in both environments.

Millimeter-Wave Propagation: Characterization and modeling toward fifth-generation systems. [Wireless Corner]

“…The FMCW technique is enabled through the use of digital synthesizers that can be clocked at a high rate. High bandwidths can be achieved through frequency multiplication with bandwidths up 6 to GHz [51]. The technique allows bandwidth compression using a replica at the receiver of the transmitted waveform but with a sweep duration much longer than the maximum expected time delay e.g.…”

“…4.7 µs duration and a sampling rate of the channel equal to 3345 [42], [10]. Multiple antenna mm-wave sounders in the 60 GHz band have been reported for 2 by 2 antenna configurations [51] and a full polarimetric 2 by 4 channel sounder at 70 GHz and 60 GHz was reported in [42][55]. The transmit antennas are switched at the rate of the waveform duration while the receive channels are implemented in parallel.…”

Channel Sounding System for MM-Wave Bands and Characterization of Indoor Propagation at 28 GHz

“…A method to overcome this is to use very fast frequency sweeping systems known as frequency modulated continuous wave (FMCW) or chirp sounders. These have been reported in literature also with a bandwidth of up to 6 GHz for capable of measuring in a dynamic environment with speeds of up to 20 km/h [24,25]. However, again these system requires dedicated equipment which has to be modified for measurements in a given frequency range.…”

Path loss model in typical outdoor environments in the 50–73 GHz band

“…In November 2015, the World Radiocommunications Conference, WRC15 identified a number of frequency bands between 24-86 GHz as possible bands for future 5G wireless communications. To estimate channel parameters such as path loss and delay spread, wideband measurements in typical indoor [1] and outdoor environments were performed which include hilly terrain with roadside vegetation, street canyon, car park and roadside. The measurements were performed at two frequencies in the 50-75 GHz band identified by WRC-15 using the 2 by 2 wideband channel sounder developed at Durham University for multiple input multiple output measurements [2].…”