J-Band Communication System considering the Near-to-far field Transitions - An Experimental Approach
Conference
Sen, P, Osmond, J, Madanayake, A et al. (2025). J-Band Communication System considering the Near-to-far field Transitions - An Experimental Approach
. 831-835. 10.1109/IEEECONF67917.2025.11443935
Sen, P, Osmond, J, Madanayake, A et al. (2025). J-Band Communication System considering the Near-to-far field Transitions - An Experimental Approach
. 831-835. 10.1109/IEEECONF67917.2025.11443935
The Terahertz (0.1-10 THz) band is a promising candidate for future wireless communication, i.e., 6G and beyond, by supporting applications like ultra-high data-rate links, joint communication-sensing, imaging, ultra-secure communication, and more. Several challenges must be addressed to fully leverage the band's potential, including those arising from its unique propagation characteristics and limitations in device performance. Moreover, the considerable near-field operational distance may facilitate transitions from near-to-far-field for mobile nodes, requiring a reevaluation of pathloss and channel characteristics through both theoretical models and experimental measurements. In this paper, we experimentally characterize THz system, focusing on frequency-selective performance, additive white-noise with phase-noise, and analyze the indoor channel using a specialized testbed operating in the J-band (220-330 GHz) designed for both near-field and far-field operations. We also discuss the signal processing backend necessary for tailored channel sounding and link establishment. Additionally, we formulate a pathloss model that accounts for near-field propagation and transitions to far-field for line-of-sight links. Our findings, supported by experimental measurements, reveal an asymmetrical communication channel for both the near-field THz uplink and downlink. We outline the channel characteristics and relevant metrics for our link, taking into account multipath effects. The findings will contribute to a deeper understanding of THz-communication systems.
