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Unformatted text preview: Lecture Outline (Week 8, lecture 1) More on Signal Space Representations CarierAmplitude Modulation  Basics Reading: Finish reading entire chapter 5 of text1. May start early part of chapter 7. 1. Geometric Representation of signal waveforms. Signal ) ( t s i expressed by coordinates for a set of orthonormal functions N n n t 1 )} ( { = , i.e. 1 ) ( ) ( = T n m dt t t if n m = and ) ( ) ( = T n m dt t t if n m The coordinates are given by = T n i n i dt t t s s , ) ( ) ( Each signal can now be represented by a point with these coordinates for N n 1 . The distance between 2 signal points is given by 2 , , 2 2 ) (   n j n i j i ij s s s s d = = Noise for the coordinates are independent and identical distributed (i.i.d.) Gaussian random variable with variance 2 / N . Demodulation is found by correlation of received signal ) ( t r with the basis functions....
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 Spring '09
 Hui

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