Knightly, Edward2020-04-272020-04-272020-052020-04-24May 2020Ghasem Pour, Yasaman. "Next-Generation Wireless Systems for Joint Communication and Sensing in Millimeter-Wave and Terahertz Spectrum." (2020) Diss., Rice University. <a href="https://hdl.handle.net/1911/108421">https://hdl.handle.net/1911/108421</a>.https://hdl.handle.net/1911/108421The use of mmWave and THz spectrum (30 GHz to 1 THz) for wireless communication is rapidly emerging as one the key paradigms for future (5G and beyond) wireless systems. mmWave/THz communication has the potential to realize an order of magnitude increase in data rates due to the availability of wide spectral bands. However, the increased propagation loss necessitate directional links which brings many challenges including user mobility, blockage, and scaling to dense user populations. This thesis presents design, implementation, and experimental evaluation of novel solutions for mobility adaptation and e cient multi-stream transmissions in mmWave and THz regime. The key idea is to exploit the wireless sensing capabilities of these higher frequencies to enhance directional communication. Namely, the mm-scale wavelength together with wide spectral band can potentially provide high-resolution sensing of user motion. Further, we can pack two order of magnitudes more antennas (i.e., potential \sensors") into the same form factor (compared to legacy 2.4 and 5 GHz bands) or exploit novel high-frequency steering devices that enhance sensing. In particular, in order to scale to dense user populations, I present the first efficient multi-stream beam training protocol for 60 GHz WLANs. I demonstrate how we can leverage channel sparsity, GHz-scale sampling rate, and the knowledge of mm-Wave RF codebook beam patterns to sense a set of beam pattern that can capture diverse or ideally orthogonal paths in order to obtain maximum stream separability. I then present the fi rst single-shot single-antenna motion sensing system in THz wireless networks that allows nodes to proactively adapt their highly directional beams under user mobility or blockage. Combined, these innovations address the key challenges of directional networking in mmWave and THz spectrum. This thesis builds the foundation for uni ed communication and sensing in future wireless technology.application/pdfengCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.mmWave SensingmmWave NetworkingTHz SensingTHz CommunicationThesis2020-04-27