Research Projects

The advancements in 5G and beyond technologies have revolutionized wireless communication, offering applications such as ultra-high data rate, high mobility, sensing, and localization. As sub-GHz bands are nearly fully occupied, wireless communication is shifting towards higher frequency bands to support ultrahigh data rate and ultra-massive connectivity. For instance, 5G NR uses mmWave bands for communications. 6G and beyond technologies are focusing on Terahertz band communication to enhance bandwidth with ultra-massive connectivity and ultra-high data rate. Terahertz band communications offer advantages such as higher link directionality and lower eavesdropping chances. However, challenges such as higher propagation losses and complex signal processing at Terahertz bands need to be overcome. Currently, orthogonal frequency division multiplexing (OFDM) fails to meet the requirements in upcoming communication scenarios, especially in high mobility use cases. To address these challenges, a new modulation technique called Orthogonal Time Frequency Space (OTFS) is proposed to support high mobility communication scenarios. OTFS uses delay-Doppler properties of the wireless channel, localizing pulses in both time and frequency. However, due to significant differences between conventional communication and OTFS-based Terahertz communication, many difficulties in routing layers, medium access control (MAC), and physical (PHY) are anticipated. The Doppler effect in Terahertz communication is severe due to ultra high carrier frequency. To address these challenges, architectures and systems must be designed considering sensitivity to blockage, molecules absorption, directivity, high propagation loss, and dynamics.