Can someone explain how does one go from frequency domain noise to multipole domain ?

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Maged Gumaan Bin-Saad

see link

Multiple reflection noise on transmission systems with periodic or quasi-periodic impedance disturbances-A frequency- domain approach

Hartman, D.

https://booksc.xyz/book/14588614/dd8a3f

https://booksc.xyz/book/37109858/9c5d90

Diego Mauricio Murillo Gomez

Hi, perhaps this is what are you looking for.

Book: Fast Multipole Methods for the Helmholtz Equation in Three Dimensions (Elsevier Series in Electromagnetism) – 27 ene 2005. Nail A Gumerov and Ramani Duraiswami