Chapter 4, Problem 33QAP

2) (15pts) In a PAM baseband digital communication system, an M-ary system has a channel bandwidth of 2 KHz. The channel introduces 10dB of losses and AWGN noise with a power spectral density of 1*10-6 W/Hz. The application requires a bit rate of 4.8 Kbps and BER of less than 10^-6. Estimate the require transmit power.

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1) (2pts) If you know you have a bad clock (lots of jitter) and you are not bandwidth constrained, you should: (Circle the correct answer) a) Set the roll off factor to zero b) Set the roll off factor to ½ c) Set the roll off factor to one 2) (2pts) Short answer: Why do we use M-ary modulation? 3) (4 pts) Short answer: The application engineer comes to your desk and says that the error rate is too high and must be reduced for the application to function correctly. The system is battery operated. What do you tell them is the trade- off?

Calculate the BMs (bending moments) at all the joints of the beam shown in Fig.1 using the Slope Deflection method. The beam is subjected to an UDL of w=65m. L=4.5m L1= 1.8m.  Assume the support at C is pinned, and A and B are roller supports.  E = 200GPa, I = 250x106 mm4.

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5) (20 pts) You are testing a system that has pulse shape shown below for Logic 1 and Logic 0. You are connecting the transmitter to an oscilloscope which is set up to display the resulting eye-diagram of the system. Sketch what you would expect to see on the oscilloscope for an ideal system (an ideal system is noiseless and jitter free) Logic 1 3 volts Time 0 Ть Logic 0 0 Ть Time -2 volts

4. (20 pts) You are given a channel with the following impulse response. Determine the set of equations that will be used to determine the coefficients of a Zero-Forcing Linear Equalizer. DO NOT SOLVE FOR THE COEFFICIENTS. Just show the set of equation that would be used to solved the coefficients. 0 m≤-31 -0.33 m = -2 .25 m = -1 h(mb) = 1 m = 0 -0.45 m = 1 0.5 m = 2 0 m≥3

I need help understanding part B. See attached photo.

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