The 2 Ã 2 matrix is called a rotation matrix because y = QX is the rotation
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is called a rotation matrix because y = QX is the rotation of x by the angle θ. Suppose X = [X1 X2] is a Gaussian (0, CX) vector where CX = diag[Ï21, Ï22] and Let Y = QX.
(a) Find the covariance of Y1 and Y2. Show that Y1 and Y2 are independent for all θ if Ï21 = Ï22.
(b) Suppose Ï22 > Ï21. For what values θ are Y1 and Y2 independent?
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Related Book For
Probability and Stochastic Processes A Friendly Introduction for Electrical and Computer Engineers
ISBN: 978-1118324561
3rd edition
Authors: Roy D. Yates, David J. Goodman
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