Verification of Dual-Polarized Ultra-Wideband Channel Sounder for THz Applications

A Modular COTS-Based High-Efficient Sub-THz Channel Sounder and Experimental Validations

“…Exploring sub-THz double-directional channel characteristics becomes more important for channel measurements and modeling. Since there are no commercial sub-THz phased arrays or high-gain omnidirectional antennas, the directional scanning sounding (DSS) with high-gain directional antennas is the most popular way to collect directional CIRs [5], [6], [9]. Such a method can be easily implemented with an antenna rotator, where sub-THz standard gain horn antenna is mechanically aligned to a desired direction, but at the expense of longer measurement duration if a full threedimensional (3D) scanning is conducted.…”

“…However, VNAbased channel sounders adopt the stepped frequency-sweeping method, which is time-consuming if using a larger number of frequency points in the sweep and lower intermediate frequencies (IF) bandwidth. Time-domain sub-THz channel sounder is based on the direct sequence spread spectrum (DSSS) technique [5], [7]- [9], which yields channel impulse response (CIR) without the implementation of inverse fast Fourier transform (IFFT) operation. Such a system transmits a known sounding sequence, whose auto-correlation function can be approximated by a Dirac-impulse-shaped function.…”

“…Such a system transmits a known sounding sequence, whose auto-correlation function can be approximated by a Dirac-impulse-shaped function. At the Rx side, the received signal is correlated with the identical stimulus signal, where cross-correlation can be completed via sliding correlator (SC) [5], [9] or pre-processing on a computer [7], [8]. The SC-based sounder consist of separated RF components operating in specific frequency bands, which reduces its flexibility to support multi-band channel measurements.…”