95 GHz Indoor Propagation Measurement and 3GPP-Compatible Channel Model for Sub-THz Indoor Short-Range Communications

This study presents a 95 GHz indoor channel measurement campaign for an ultra-wideband short-range communication scenario and proposes an intra-cluster stochastic channel generation procedure compatible with the well-known 3GPP stochastic channel model (SCM) for this use case with a larger bandwidth than 2 GHz. Recently, a 3GPP-compatible SCM for device-to-device (D2D) short-range communication in a bandwidth of 2 GHz has been developed at the 60 GHz band to provide a unified channel generation framework aligned with 3GPP-led cellular-type communications with lower bandwidth (e.g., 400 MHz typical for millimeter wave communications). This study aims to extend this framework for an upper band and larger bandwidth by defining the experimentally found large-scale parameters at 90–100 GHz while adjusting the intra-cluster subpath generation mechanism. To this end, we first conduct a wideband multipath channel measurement at 95 GHz center frequency with 4 GHz bandwidth in a simple conference room scenario as an exemplary environment of wideband short-range communication. Statistical characteristics of a complete set of large-scale parameters (LSPs) for running the 3GPP-compatible SCM are derived where LSP trends specific to D2D short-range communication scenarios in a small conference room and extendable from the recent 60 GHz measurements are observed. Moreover, we propose an unequal intra-cluster subpath generation procedure, serving as an additional adjustment for accurate channel generation for bandwidths greater than 2 GHz. Numerical evaluation reveals the feasibility of generating channel impulse responses capturing more accurate characteristics at both the large-scale level and intra-cluster level. Specifically, owing to the proposed adjustment, the statistical characteristics in the intra-cluster subpath well fit the results from our presented measurements.