Teal, Paul DKennedy, Rodney2015-12-131536-1276http://hdl.handle.net/1885/77508A bound is derived for the extent to which narrow-band knowledge of a multipath field inside a spatially limited region can be extrapolated beyond that region. The bound is independent of any model which may be applied to the multipath field, relying on the field being a solution to the homogeneous Helmholtz wave equation. The bound has implications for the extent and reliability of long-range channel prediction, particularly when the multipath is diffuse.Keywords: Bessel functions; Communication channels (information theory); Error analysis; Extrapolation; Fourier transforms; Integration; Wave equations; Bounds; Long-range channel prediction; Propagation and channel characterization; Spatial extrapolation of multip Bounds; Long-range channel prediction; Propagation and channel characterization; Spatial extrapolation of multipath; Wireless channel modeling200410.1109/TWC.2003.8211452015-12-11