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Space-Time Wireless Channels by Gregory D. Durgin

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Chapter 6. The Angle Spectrum

The concept of a delay spectrum is intuitive: Multipath power arrives with different propagation delays, causing a smear of received power as a function of time delay. A Doppler spectrum is equally intuitive: Moving objects in the channel introduce nonzero Doppler frequencies to selected multipath components.

The concept of a wavenumber spectrum is not so intuitive, as scientists and engineers do not often work in the spectral domain of space. Even in the filed of wireless channel modeling, most engineers characterize multipath in space using an angle spectrum rather than a wavenumber spectrum. The angle spectrum describes the angle-of-arrival of incoming multipath power. This geometrically intuitive angle spectrum ...

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