5G Wireless Backhaul Trials

15 November, 2019 | Mobile Communications
Article by Matthias Pätzold
In a joint innovation project, Ericsson and Deutsche Telekom have achieved a landmark data transmission rate, consistently topping 100 Gb/s in a trial microwave link over 1.5 km.

Conducted at the Deutsche Telekom Service Center in Athens, Greece, this trial represents a major technical breakthrough, achieving throughput speeds more than 10 times greater than current commercial solutions on the mm-wave spectrum (70/80 GHz and above).

The achieved milestone confirmed the feasibility of microwave technology over the mm-wave spectrum as a key technology capable of meeting the performance requirements for 5G. In addition, the trial showed the importance of applying spectral-efficient techniques, such as multiple-input, multiple-output (MIMO), on wireless backhaul technologies to address upcoming 5G radio-access demands.

The key technological advances of the trial included an 8 x 8 line-of-sight MIMO transmission link with a cross-polarization interference cancellation setup using Ericsson’s commercial MINI-LINK 6352 radios and a 2.5-GHz channel bandwidth in the E band (70/80 GHz) capable of transmitting eight independent data streams over the radio path.

This corresponds to a breakthrough spectrum efficiency of 55.2 b/s/Hz at peak. During the mid-April trial, measured transmission rates were consistently above 100 Gb/s, with a telecom-grade availability of more than 99.995% and peak data transmission rates reaching 140 Gb/s.

Full article: IEEE Vehicular Technology Magazine, Volume 14, Number 3, September 2019

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