sm9_5
1 pág.

sm9_5

Disciplina:Teoria de Telecomunicações224 materiais350 seguidores
Pré-visualização1 página
Problem 9.5. The message signal of Problem 9.2 having a bandwidth W of 4 kHz is
transmitted over the same noisy channel having a noise spectral density N0/2 of 2x10-17
watts per hertz using single-sideband modulation. If the average received power of the
signal is -80 dBm, what is the post-detection signal-to-noise ratio of the receiver?
Compare the transmission bandwidth of the SSB receiver to that of the DSB-SC receiver.
Solution
From Eq. (9.23)

2
SSB
post

0

SNR
2

cA P
N W

=

with
2

80 dBm
2
cA P = − , , and . The 4 kHzW = 170 104 −×=N

SSB
postSNR 18 dB=

The transmission bandwidth of SSB is 4 kHz, half of the 8 kHz used with DSB-SC.

Excerpts from this work may be reproduced by instructors for distribution on a not-for-profit basis for testing or instructional purposes only
to students enrolled in courses for which the textbook has been adopted. Any other reproduction or translation of this work beyond that
permitted by Sections 107 or 108 of the 1976 United States Copyright Act without the permission of the copyright owner is unlawful.