Simulations of Indoor Transmission in 73-142 GHz

Abstract

Utilization of the large bandwidth available in the mmWave/sub-Terahertz spectrum will enable a number of new broadband use cases of indoor communication systems. This paper presents simulation performance of indoor transmission at selected carrier frequencies in the range 73-142 GHz. All simulations assume an average Effective Isotropic Radiate Power (EIRP) of 40 dBm and a receiver antenna gain of 25 dBi. An LTE testbed with up/down converters is used for video streaming over 20 MHz channels at 73 GHz and 142 GHz. The higher carrier frequency (142 GHz) has encountered lower reflection losses and performed better than the lower carrier frequency (73 GHz). A ray-tracing wireless prediction software with a scattering model is also used to simulate broadband transmission over 2 GHz channels at a carrier frequency of 100 GHz. In one office space of about 13m-by-25m, an optimally located single transmitter has provided a near ubiquitous coverage with a channel capacity over 14 Gbps. In another office space of 35m-by-50m, three optimally located transmitters have also provided a near ubiquitous coverage and a channel capacity over 10 Gbps. Signal scattering from common indoor building materials has extended coverage and enhanced signal quality especially under Non-Line-of-Sight (NLoS) conditions. The frequency range 73-142 GHz is useful for future high-capacity, high-speed and low-latency indoor communication systems that can use LTE-based signalling.