This Appendix derives the three rate variance relationships presented in Chapter 5.
The power spectral density (PSD) of a baseband complex received voltage signal is related to the angular distribution of multipath power [Gan72]:
where θ is the azimuthal direction of travel and p(·) is the angular distribution of impinging multipath power. The value kmax is the maximum wavenumber, which is equal to 2π/λ. Note that the PSD is a function of wavenumber, k, instead of frequency, ω, since multipath angles-of-arrival directly relate to spatial ...