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RAR Series

Rural America Repeater
Features

Superior EIRP (~ 51 dBm)
Highly efficient receive sensitivity (NF-Ga) = -13 dB)
Up to 12 km range from gNB
Low complexity/cost high-gain dielectric antenna
Dual polarized repeater

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RAR Series Overview

A typical RAR configuration consists of one donor unit (DU) and one service unit (SU), interconnected via cable. The DU relays transmissions to/from the gNB, whereas the SU relays transmissions to/from UEs. Novel high-gain antennas based on dielectric rods can be optionally used at the DU and SU to communicate in a directional fashion. RAR can be customized for any 5G New Radio (NR) mmWave bands, as defined by the 3GPP specs, including the n261 (27.5 – 28.35 GHz), n259 (27 – 29.5 GHz), n258 (24.25 – 27.5 GHz), and n261 (37-40 GHz) bands. Incoming gNB/UE signals are dynamically amplified, providing for 90 dB maximum electronic gain the combined DU/SU system. The repeater exhibits a very low noise figure (NF) of ~ 3 dB. Being waveform agnostic, RAR can support all modulation and coding schemes (MCSs) transmitted by the gNB and UE. The DU and SU integrate two Tx/Rx chains with high isolation. Their antennas are dual polarized with more than 90 dB isolation between the vertical (V) and horizontal (H) polarizations. The latency for the RAR’s amplify-and-forward operation is in the order of nanoseconds. To comply with 5G NR protocols, RAR supports dynamic tracking of TDD cycles, without the need for explicit gNB control messages. This is done through integrated power sensors at the receive ports of the DU and SU. RAR can be mounted on light poles, traffic lights, and rooftops.


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Besides its technological value, RAR has a broader societal impact in contributing to bridging the digital divide between urban and rural communities. Given the high cost of deploying new infrastructure, operators have been reluctant to offer 5G mmWave services outside dense localities, leaving rural communities at a great disadvantage. The economic ramifications and social injustice caused by the disparity in broadband access are now widely recognized, triggering a significant push for new policies and technological advances that remedy this situation. Anecdotal evidence of the implications of this digital divide on K-12 education is seen with during the ongoing covid-19 pandemic, where many schools in small towns and rural areas were left stranded with mediocre Internet access, not enough to meet the high demand for interactive online classes with good streaming quality.

RAR Series can be easily modified to support other 3GPP 5G NR bands, which include the n258 band (24.25 to 27.5 GHz), n257 band (26.5 to 29.5 GHz), and n260 band (37 to 40 GHz).
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Making 5G Happen

ED2 is an elite team that can solve engineering challenges that others find too difficult. We have extensive expertise in RF radio, radar, software, and wireless systems; our core team holds numerous patents.
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