Ch4

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Unformatted text preview: Notice that ÀÏ ´Þ µ depends only on ÀÊ ´ µ, and can be determined a prior according to our choice of ÀÊ ´ µ. At the output of ÀÏ ´Þ µ, the noise sequence is white. Therefore, equivalently, we can consider the equivalent discrete-time model shown in Figure 4.13, in which Ò is an effect of AWGN sequence. ¯ Let ´Þµ À ´ÞµÀÏ ´Þµ. The communication system from the information source to the output of the noise whitening filter can now be represented by the discrete-time white-noise linear filter model in Figure 4.14. The output sequence Á is given by Á Á ·Ò Á ¼· where Á ·Ò is the impulse response corresponding to the transfer function 4.11 (4.17) ´Þµ, and Ò is an Wong & Lok: Theory of Digital Communications H(z) Ik 4. ISI & Equalization ~ Ik HW ( z ) EQZ Decision ~ nk Figure 4.13: Equivalent discrete-time communication system model with white noise ~ Ik G(z) Ik EQZ Decision ~ nk Figure 4.14: Equivalent discrete-time white-noise linear filter model AWGN sequence. We...
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This note was uploaded on 12/13/2012 for the course EEL 6535 taught by Professor Shea during the Spring '08 term at University of Florida.

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