Millimetere wave (mmWave) channel model is widely known in the literature [1, eq. (7)], [2, eq. (1)]. [3, (55)].
What is the difference between mmWave vs. Terahertz Channel Models? In other words, is there any paper providing the channel model for Terahertz bands (including path loss, path gains, AoD/AoA, etc.)?
[1] A. Koc and T. Le-Ngoc, "Hybrid Millimeter-Wave Massive MIMO Systems with Low CSI Overhead and Few-Bit DACs/ADCs", Accepted in IEEE 92nd Vehicular Technology Conference: VTC2020-Fall , Victoria, BC, Canada, October 2020.
[2] L. Yan, C. Han and J. Yuan, "A Dynamic Array-of-Subarrays Architecture and Hybrid Precoding Algorithms for Terahertz Wireless Communications," in IEEE Journal on Selected Areas in Communications, vol. 38, no. 9, pp. 2041-2056, Sept. 2020
[3] A. Morsali, A. Haghighat and B. Champagne, "Generalized Framework for Hybrid Analog/Digital Signal Processing in Massive and Ultra-Massive-MIMO Systems," in IEEE Access, vol. 8, pp. 100262-100279, 2020
Hi Asil,
The main differences between mmWave (< 100 GHz) and THz (0.1 - 10 THz) channels are:
1) High molecular absorption losses at THz frequencies; this has to be taken into account when calculating the path loss.
2) Very limited scattering owing to the high propagation losses. In practice, you can consider a line-of-sight and/or a few specularly reflected rays.
3) Extremely large signal bandwidths, i.e., more than 10 GHz, which yield frequency-selective path loss. Consequently, a wideband channel model should be employed.
For more information, you could also check the following papers:
1) C. Han and I. F. Akyildiz, "Three-dimensional end-to-end modeling and analysis for graphene-enabled terahertz band communications," IEEE Trans. Veh. Technol., vol. 66, no. 7, Jul. 2017.
2) C. Han, A. O. Bicen and I. F. Akyildiz, "Multi-ray channel modeling and wideband characterization for wireless communications in the terahertz band," IEEE Trans. Wireless Commun., vol. 14, no. 5, May 2015.
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