Air-to-Ground MIMO Channel Measurements

Squires, Christopher C.; Colman, Geoff W.K.; Willink, T.J.

doi:10.2316/p.2012.784-016

Cited by 1 publication

(1 citation statement)

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“…The PN sequences were BPSK-modulated at a carrier frequency of 915 MHz and chip rate of 5 Mcps; a reference clock was provided to the FPGA and frequency synthesizer using a low-power ovencontrolled 10 MHz crystal oscillator. For a block diagram of the transmitter, see [27]. The signals on each channel were amplified to 28 dBm before the 10 MHz filters, which were required to protect the telemetry system of the UAV.…”

Section: A Channel Soundermentioning

confidence: 99%

Measurement and Characterization of Low-Altitude Air-to-Ground MIMO Channels

Willink

Squires

Colman

et al. 2016

IEEE Trans. Veh. Technol.

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To support the development of high-capacity airto-ground links for range extension, measurements of the lowaltitude air-to-ground channel were made at 915 MHz. Two transmit antennas were mounted on a UAV, which was flown in loops at an altitude of approximately 200 m above ground level. The received signals were recorded at each of eight antenna elements mounted on a van, at locations outside and inside the flight loop. Analysis of the measurements shows that there are regions where the spatial diversity is significant, despite the sparse multipath environment, indicating spatial decorrelation at both the ground and air terminals. The variations in spatial correlation across the receiver array indicate the presence of nonplanar wavefronts produced by the signals' interaction with objects in the array near-field, in particular, the measurement vehicle. A similar effect is probable at the UAV, and it is expected that more significant near-field effects would arise on a more conventional air platform. These support significant reductions in outage probability at both receiver locations: with appropriate signalling strategies, an airborne platform could provide a viable relay or broadcast node for high capacity communications using MIMO.

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Section: A Channel Soundermentioning

confidence: 99%