Now consider that white noise (i.e., noise with a PSD that is constant with frequency) is introduced in the channel of the system described in the previous problem. An ideal low pass filter is used at the receiver input to reduce the noise as much as possible, while transmitting the desired signal. (a) By what factor should the cutoff frequency of the noise reduction filter be reduced in the 8-PAM case, compared to binary? (b) By what factor will the noise power at the decision circuit be reduced in the 8-PAM case? (c) By what factor will the noise amplitude at the decision circuit be reduced in the 8-PAM case? (d) To obtain the same symbol error rate for 8-PAM as for binary, how should the minimum level spacing for 8-PAM compare to binary? (e) If the 8-PAM level spacing is adjusted according to part (d) above, by what factor will the average signal power be increased in the 8-PAM case, compared to binary?

Now consider that white noise (i.e., noise with a PSD that is constant with frequency) is introduced in the channel of the system described in the previous problem. An ideal low pass filter is used at the receiver input to reduce the noise as much as possible, while transmitting the desired signal. (a) By what factor should the cutoff frequency of the noise reduction filter be reduced in the 8-PAM case, compared to binary? (b) By what factor will the noise power at the decision circuit be reduced in the 8-PAM case? (c) By what factor will the noise amplitude at the decision circuit be reduced in the 8-PAM case? (d) To obtain the same symbol error rate for 8-PAM as for binary, how should the minimum level spacing for 8-PAM compare to binary? (e) If the 8-PAM level spacing is adjusted according to part (d) above, by what factor will the average signal power be increased in the 8-PAM case, compared to binary?

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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