Spatio-temporal channel characteristics at base station in microwave urban propagation

Propagation measurements were performed in an urban area at 8.45 GHz. We examined the delay and angle spread characteristic of the main arrival wave at the base-station receiving antenna. The delay spread (σ_d) tends to increase with the angle spread (σ _mainφ). Both σ_mainφ and σ_d in the line-of-sight (LOS) environments were smaller than those in the non-LOS (NLOS) environments. σ_d in the NLOS environments was greater than that at locations with the same angle spread in the LOS environments. σ_mainφ in the LOS environments did not depend on the distance between the transmitter and receiver. Likewise, in the NLOS environments, if did not depend on the distance between the corner and receiver