Ambit-process based spatial-wideband MIMO channel model for sub-THz urban microcellular communication

Shrayan Das, Debarati Sen, Emanuele Viterbo, Ashok Kumar Reddy Chavva, Diwakar Sharma, Anshuman Nigam

Research output: Contribution to journalArticleResearchpeer-review


The design and development of sub-Terahertz (sub-THz) cellular systems entail the need for new channel models that can precisely predict channel characteristics beyond 100 GHz in outdoor and dynamic environments. This work proposes a novel multiple-input and multiple-output (MIMO) channel model for cellular communication, developed within the framework of a class of spatio-temporal stochastic processes called ambit-process. The modeling methodology effectively captures the typicalities of sub-THz propagation like molecular absorption and scattering of the evolving multipaths while accounting for the propagation delay of electromagnetic waves across large array apertures deployed at the transmitter and the receiver. This allows for an accurate characterization of the spatial-wideband effect along with other relevant spatio-temporal attributes of the channel. Numerical simulations indicate a good level of agreement between the spectral efficiency and spatio-temporal correlation of the proposed model against a state-of-the-art stochastic Terahertz (THz) channel model and measurements reported in the literature.

Original languageEnglish
Number of pages16
JournalIEEE Transactions on Wireless Communications
Publication statusAccepted/In press - 2 Jun 2023


  • 140 GHz
  • ambit-process
  • diffused scattering
  • molecular absorption
  • Spatial-wideband effect
  • spatio-temporal consistency
  • stochastic-hybrid ray tracing
  • sub-THz MIMO channel
  • urban-microcells

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