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Unformatted text preview: N ( j ) = 0 for   > T s . For the spectrum of N ( j ) refer to the figure. (c) (20%) Let g ( t ) be a periodic rectangular wave train with period T s . We define g ( t ) over one period [0 ,T s ) as g ( t ) = 1 t < T s 2 T s 2 t < T s Derive and sketch G ( j ) (the FT of g ( t ) ). (d) (20%) After multiplying the interference n ( t ) with the periodic signal g ( t ) , we obtain n g ( t ) = n ( t ) g ( t ) . Find N g ( j ) (the FT of n g ( t ) ) in terms of N ( j ) . Sketch N g ( j ) . (e) (5%) Sketch Y ( j ) (the FT of y ( t ) ). (f) (20%) Propose a system that reconstructs x ( t ) from y ( t ) in the presence of interference n ( t ) ....
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 Spring '09
 RAICH

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