Ray-based Deterministic Channel Modelling for sub-THz Band

Abstract

Future wireless communications systems will require large network capacities beyond the capabilities of present and upcoming 5G technology. The trend of considering higher frequencies for their large bandwidths continues today into the sub-THz domain. The BRAVE project considers the frequencies in the 90-200 GHz spectrum, which have been considered in this paper. The challenges of channel modelling at sub-THz frequencies are described along with extensions made to a ray-based deterministic tool. The geographical and physical accuracies inherent to the ray-based tool are exploited to simulate two different scenarios. The first scenario is an indoor office scenario and the second is an outdoor in-street scenario. The application of the updated channel modelling properties of the ray-based tool provides interesting perspectives into the sub-THz channel modelling. This permits the development of realistic models for the evaluation, characterization and eventual deployment of such systems.

MIMO Techniques for Wireless Terabits Systems under Sub-THz Channel with RF Impairments

“…A ray-based deterministic channel modeling for sub-THz Band (mainly between 90-200 GHz) is presented in [10]. It is worth mentioning that the propagation channel model in [10] considers the material properties, gaz attenuation and the impact of furniture that leads to more obstructions along the propagation paths and new scattered paths. In addition, it characterizes the main channel properties such as path loss and delay spread for LOS, NLOS with vegetation and NLOS cases for indoor in-office and outdoor in-street scenarios.…”

“…In the context of BRAVE project [4], we target to explore the sub-THz bands (90-200 GHz) for wireless Tbps communication. The RF-impairments increase at high frequencies and the signal propagation in sub-THz channel suffers from high atmospheric attenuation and high sensitivity to small environment details [10]. The major RF-impairments in sub-THz band are the Phase Noise (PN) introduced by the LOs, the low output power and the limited resolution of low-power high-speed Analog-to-Digital Converters (ADCs).…”

“…T x i = θ T x j and θ Rx i = θ Rx jfor all i = j. However, in the CO setup with independent oscillators for Tx and Rx sides (same oscillator is used for all antennas on each side but different oscillators for the Tx and Rx), θ T x i = θ T x for all In-office scenario environment[10] i = 1, ..., N t and θ Rx j = θ Rx for all j = 1, ..., N r . Thus, the received signal in the CO setup can be simplified to: y = e jθ T x e jθ Rx Hx + n (10)…”

Design of Digital Communications for Strong Phase Noise Channels

“…Complementary results on non-LoS components can be found in [12]. Sub-THz channels have also been characterized in [13] using deterministic ray-tracing tools. We assume subsequently in this paper a LoS propagation channel model.…”

Optimized Single Carrier Transceiver for Future Sub-TeraHertz Applications

“…Numerical simulation is a very convenient solution to complement this characterization, and produce on-demand channel samples. The Volcano ray-based model has been extended up to the sub-THz frequencies [12]. It is employed in the present study to predict the propagation of an in-street backhaul scenario; then the performance of the proposed modulation scheme has been assessed considering this data combined with highly-directive antennas and different PN conditions.…”