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]:

**Equation C.1. **

where θ is the azimuthal direction of travel and *p*(·) is the angular distribution of impinging multipath power. The value *k*_{max} 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 ...*

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