Physics

Channel (broadcasting)

Aerospace engineering

Bandwidth (computing)

Computer network

Wireless

Backhaul (telecommunications)

Communications satellite

Frequency allocation

Frequency-hopping spread spectrum

Engineering

Multi-band device

Electromagnetic spectrum

Satellite

Antenna (radio)

Electronic engineering

Frequency band

Interference (communication)

Computer science

Transmitter

Quantum mechanics

Telecommunications

Radio spectrum

Communications Engineering

Sixth-generation wireless networks will aggregate higher-than-ever mobile traffic into ultra-high capacity backhaul links, which could be deployed on the largely untapped spectrum above 100 GHz. Current regulations however prevent the allocation of large contiguous bands for communications at these frequencies, since several narrow bands are reserved to protect passive sensing services. These include radio astronomy and Earth exploration satellites using sensors that suffer from harmful interference from active transmitters. Here we show that active and passive spectrum sharing above 100 GHz is feasible by introducing and experimentally evaluating a real-time, dual-band backhaul prototype that tracks the presence of passive users (in this case the NASA satellite Aura) and avoids interference by automatically switching bands (123.5–140 GHz and 210–225 GHz). Our system enables wide-band transmissions in the above-100-GHz spectrum, while avoiding harmful interference to satellite systems, paving the way for innovative spectrum policy and technologies in these crucial bands.

Dynamic spectrum sharing between active and passive users above 100 GHz