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Text files expressing the Excess Loss (Fig. 3, left) and root mean square Delay Spread (Fig. 3, right) data arranged by azimuthal angle for the specified transmitting directive horn antenna and height.

Text files expressing the Error Vector Magnitude (Fig. 4, left) and Throughput (Fig. 4, right) data arranged by azimuthal angle for the specified transmitting directive horn antenna and height.

Text files expressing the Average Data Throughput data arranged by Average EVM (Fig. 5, left) and Received Power Spectral Density (Fig. 5, right) for the specified TX-RX distance and two 10° HPBW directive horn antennas.

An ultra-wideband omnidirectional RX with a typical gain of 6 dBi and an elevation HPBW of 20° is placed at the center of the front headrest. TX is positioned at a horizontal distance of 2.6 m from RX, at various heights and azimuthal angles, and boresight aligned with RX. At a TX height of 3.0 m, measurements are performed for both aligned and unaligned RX, in order to understand the impact of its antenna pattern. At each position, measurements are performed consecutively with three directional waveguide horn antennas, varying the HPBW from 10° to 30° to 55°. The different antenna gains of each waveguide are taken into account in the analysis of the measurement results. Our channel sounding equipment uses the pulse compression method and consists of an R&S SMW200A vector signal generator, an R&S SMZ90 frequency multiplier, an R&S FSW85 signal and spectrum analyzer and an R&S RTO2044 digital oscilloscope. Further details on the facility and channel sounding methodology can be found in our previous work [1].
The Excess Loss and root mean square Delay Spread parameters are extracted from the channel sounder’s calculated power delay profiles (PDP). EL is defined as the difference between the received power level and the expected power level, based on a free-space path loss model, and taking into account signal losses and gains due to the used equipment, based on extensive calibration measurements. The RMS-DS is the standard deviation of the delay times τ between the line-of-sight (LOS) and a significant multipath component (MPC), which are weighted by the received power at that time, PDP(τ), according to: RMS-DS = √((∫(τ-τ_m)^2*PDP(τ)dτ)/(∫PDP(τ)dτ)) with τ_m = (∫τ*PDP(τ)dτ)/(∫PDP(τ)dτ).

The link performance experiments are carried out using the NI mmWave Transceiver System (MTS). The MTS is a software-defined radio with 2 GHz of real-time bandwidth that can be used to create over-the-air prototypes of 5G New Radio (NR) communications links. A multi-FPGA processing architecture enables to both capture and generate 2 GHz of data and to process it in real time. The MTS is a modular system and built from a common set of PXI Express hardware: a PXIe-3610 digital-to-analog converter (DAC), a PXIe-3630 analog-to-digital converter (ADC), and a PXIe-3620 local oscillator and intermediate frequency module. Each DAC and ADC is paired with a PXIe-7902 FPGA module for (de)modulation. A PXIe-6674T timing and synchronization module provides a high quality 10 MHz clock source and a trigger for synchronization of multiple channels. Outside of the PXI chassis, the MTS is connected to mmWave heads: a mmRH-3642 transmitter and a mmRH-3652 receiver, optimized for the frequency band from 27.5 to 29.5 GHz, with 2 GHz instantaneous bandwidth and an analog gain range of at least 50 dB. In addition to the RF hardware in the MTS, four additional FPGAs are added to the system to create a real-time 5G NR physical layer and to allow for real-time encoding and decoding of the communication link’s signal, which enables a data throughput calculation. The MTS software configuration follows the Verizon 5G specifications, using eight 100 MHz component carriers resulting in a total 800 MHz bandwidth, a cyclic prefix orthogonal frequency-division multiplexing (CP-OFDM) waveform, dynamic time-division duplexing (TDD), turbo coding, and as possible modulation schemes quadrature phase shift keying (QPSK), 16-QAM and 64-QAM (quadrature amplitude modulation).

In order to allow for a detailed comparison between the channel sounding and link performance results, additional systematic measurements are carried out, involving the same, boresight aligned 10° HPBW TX horn antenna and omnidirectional RX at fixed antenna distances in a clear LOS set-up inside the WMG 3xD Simulator. For various TX-RX distances, the TX output power is stepwise reduced and the resulting EVM and throughput are compared with precise RX received power values from channel sounding measurements. Due to the bandwidth difference between both methods, 800 MHz versus 2 GHz, the received power is divided by the used bandwidth in order to obtain the Received Power Spectral Density (RPSD).

Each text file named "EL_HPBW**_*p*m.txt" contains the determined Excess Loss using a TX with a **° HPBW at a height of *.*m, boresight aligned with RX. The first column contains the azimuth angle in degrees, and the second and third column contain the Excess Loss and its standard deviation in dBm.
Each text file named "DS_HPBW**_*p*m.txt" contains the determined root mean square Delay Spread using a TX with a **° HPBW at a height of *.*m, boresight aligned with RX. The first column contains the azimuth angle in degrees, and the second and third column contain the root mean square Delay Spread and its standard deviation in nanoseconds.
Each text file named "TP_HPBW**_*p*m.txt" contains the averaged data Throughput using a TX with a **° HPBW at a height of *.*m, boresight aligned with RX. The first column contains the azimuth angle in degrees, and the second and third column contain the average data Throughput and its standard deviation in Mb/s.
Each text file named "EVM_HPBW**_*p*m.txt" contains the Error Vector Magnitude using a TX with a **° HPBW at a height of *.*m, boresight aligned with RX. The first column contains the azimuth angle in degrees, and the second and third column contain the Error Vector Magnitude and its standard deviation in dB.
Each text file named "TPvsEVM_*m.txt" contains the averaged data Throughput at a TX-RX separation of *m, with boresight aligned TX and RX. The first column contains the Error Vector Magnitude in dB, and the second column contains the average data Throughput in Mb/s.
Each text file named "TPvsRPSD_*m.txt" contains the averaged data Throughput at a TX-RX separation of *m, with boresight aligned TX and RX. The first column contains the Received Power Spectral Density in dBm/Hz, and the second column contains the average data Throughput in Mb/s.

References:
[1] E. Kampert, P. A. Jennings, and M. D. Higgins, "Investigating the V2V Millimeter-Wave Channel Near a Vehicular Headlight in an Engine Bay," IEEE Commun. Lett., vol. 22, no. 7, pp. 1506-1509, Jul. 2018.