Wideband Measurements of Angle and Delay Dispersion for Outdoor and Indoor Peer-to-Peer Radio Channels at 1920 MHz

This paper presents spatio-temporal measurements for the peer-to-peer radio channel at a center frequency of 1920 MHz with 140 MHz of radio-frequency bandwidth. The measurements were taken using a spread-spectrum channel sounder and an automated spatial probing system that uses precise computer-controlled positioning and orientation of omnidirectional and directional (30 beamwidth) antennas to measure both the angles-of-arrival and time-delays of multipath components. Transmitter-receiver configurations included six outdoor-to-outdoor cross-campus locations at Virginia Polytechnic Institute and State University (17–219 ns rms delay spread, 0.36–0.91 angular spread—using the unitless definition of angular spread defined in [1]), three outdoor-to-indoor locations (27–34 ns rms delay spread, 0.78–0.98 angular spread), and three indoor-to-indoor locations (29–45 ns rms delay spread, 0.73–0.90 angular spread). The paper also quantitatively describes a trend that shows how angular spread increases with increasing delay spread.