[asac] [almanews] ALMA Memo 385 Released

[Stacy Oliver]

ALMA Memo 385

Orthogonal Functions for Phase Switching and a Correction to ALMA Memo 287

Larry R. D'Addario

2001-Aug-09

In a synthesis array, modulation of each antenna's signal is often used
for separating desired from undesired signals, or for separating two
desired signals.  This requires the use of modulating functions that are
orthogonal among the antennas.  Among two-valued functions, only the
Walsh functions and the Rademacher functions are known to form mutually
orthogonal sets.  An earlier memo (#287) claimed that the square waves
whose frequencies are proportional to the positive integers are mutually
orthogonal, but this is incorrect.

View a pdf version of ALMA Memo 385.
	http://www.alma.nrao.edu/memos/html-memos/alma385/memo385.pdf
Download a ps version of ALMA Memo 385.
	http://www.alma.nrao.edu/memos/html-memos/alma385/memo385.ps

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