Digital Communication: Solutions Manual by Edward A. Lee, David G. Messerschmitt

By Edward A. Lee, David G. Messerschmitt

This complement comprises labored out strategies to the bankruptcy finish challenge units present in Digital verbal exchange, moment Edition, ISBN 0-7923-9391-0.

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Digital Communication: Solutions Manual

This complement includes labored out options to the bankruptcy finish challenge units present in electronic communique, moment version, ISBN 0-7923-9391-0.

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Set £ to zero. 0 2 =O. which says that we correlate the shot noise against Ihe logarithm of Ihe known intensity. • we get p. 227) where E, is the energy corresponding to the intensity. E; 9-23. w0 dt. 228) First equate the two representations of I, (I). 48). 1,(1) - N s,; = 1: F,): "'i(l) = 1: i=1 ~;(I). 229) Now fonn the inner product of both sides with ~... (I). 231) Finally. 46)• - s,·• - y. N y;·-t V,=1: ;=1 (J; N - y. "';; ; =1 (J, i=1 i = I ;=1 (J; N =Lf,j,Ui i=1 .

D) The time domain pulses are not real. To use these pulses for orthogonal multipulse over a real channel, we need to modulate them, fonning the real-valued passband equivalent pulses h. 1 h. 376) for some roc ~ 7tIT. fi T -TI -O _. _.. D 2x T ~ CJ) 4x T Figure ~60. The Fourier transform for the orthonormal pulses in problem 6·29. The value of Hit (j CJ) in the dashed regions of the CJ) axis is determined by the requirement for conjugate symmetry. while the value in the solid regions is determined by 8(CJ).

1 AI". f h;(1 -1cT)dl 2 a <'}:liA - t~ .. (KT - kT)2 =1 1". If the data symbols are drawn from a finite constellation, we can assume that K~ C 1. The remaining sum. 125) JrT N L Al". is boWlded. say by .. ~ 1I(KT - kT)2 is also bounded. since the series is convergent. say by C 2. KT) is bounded by a constant at: lC 2. independent of K , and the fraction of the energy outside [KT. 00) goes to zero since the energy of s (I) is increasing with K. 44 DIGITALCOMMUNICATlON CHAPTER 8: SOLUTIONS TO PROBLEMS 8-1.

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