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Radio channels at mmWave and sub-THz frequencies for 5G and 6G communicationsoffer large channel bandwidths (hundreds of MHz to several GHz) to achievemulti-Gbps data rates. Accurate modeling of the radio channel for these widebandwidths requires capturing the absolute timing of multipath component (MPC)propagation delays with sub-nanosecond accuracy. Achieving such timing accuracyis challenging due to clock drift in untethered transmitter (TX) and receiver(RX) clocks used in time-domain channel sounders, yet will become vital in manyfuture 6G applications. This paper proposes a novel solution utilizingprecision time protocol (PTP) and periodic drift correction to achieve absolutetiming for MPCs in power delay profiles (PDPs) --captured as discrete samplesusing sliding correlation channel sounders. Two RaspberryPi computers areprogrammed to implement PTP over a dedicated Wi-Fi link and synchronize the TXand RX Rubidium clocks continuously every second. This synchronizationminimizes clock drift, reducing PDP sample drift to 150 samples/hour, comparedto several thousand samples/hour without synchronization. Additionally, aperiodic drift correction algorithm is applied to eliminate PDP sample driftand achieve sub-nanosecond timing accuracy for MPC delays. The achievedsynchronicity eliminates the need for tedious and sometimes inaccurate raytracing to synthesize omnidirectional PDPs from directional measurements. Thepresented solution shows promise in myriad applications, including preciseposition location and distributed systems that require sub-nanosecond timingaccuracy and synchronization among components.

A Sub-Terahertz Sliding Correlator Channel Sounder with Absolute Timing using Precision Time Protocol over Wi-Fi