Question

Example Satellite Jamming • Figure 12.25 illustrates a satellite jamming scenario. The airplane terminal is equipped with a frequency-hopping (FH) spread-spectrum system transmitting with an EIRPT = 20 dBW. The data rate is R = 100 bits/s. The jammer is transmitting wideband Gaussian noise, continually, with an EIRPJ = 60 dBW. Assume that $(E_b/J_0)_{reqd}$ = 10 dB and that the path loss is identical for the airplane terminal and the jammer. a. Should the communicators be concerned more with the jamming of the uplink or with that of the downlink? b. If it is desired to have an AJ margin of 20 dB, what should be the value of the hopping bandwidth $W_a$? Uplink Terminal EIRP = 20 dBW Jammer EIRP = 60 dBW Figure 12.25 Satellite jamming scenario

          Example Satellite Jamming
• Figure 12.25 illustrates a satellite jamming scenario. The
airplane terminal is equipped with a frequency-hopping (FH)
spread-spectrum system transmitting with an EIRPT = 20
dBW. The data rate is R = 100 bits/s. The jammer is
transmitting wideband Gaussian noise, continually, with an
EIRPJ = 60 dBW. Assume that $(E_b/J_0)_{reqd}$ = 10 dB and that
the path loss is identical for the airplane terminal and the
jammer.
a. Should the communicators be concerned more with the
jamming of the uplink or with that of the downlink?
b. If it is desired to have an AJ margin of 20 dB, what should be
the value of the hopping bandwidth $W_a$?
Uplink
Terminal
EIRP = 20 dBW
Jammer
EIRP = 60 dBW
Figure 12.25 Satellite jamming scenario

Example Satellite Jamming
• Figure 12.25 illustrates a satellite jamming scenario. The
airplane terminal is equipped with a frequency-hopping (FH)
spread-spectrum system transmitting with an EIRPT = 20
dBW. The data rate is R = 100 bits/s. The jammer is
transmitting wideband Gaussian noise, continually, with an
EIRPJ = 60 dBW. Assume that (Eb/J0)reqd = 10 dB and that
the path loss is identical for the airplane terminal and the
jammer.
a. Should the communicators be concerned more with the
jamming of the uplink or with that of the downlink?
b. If it is desired to have an AJ margin of 20 dB, what should be
the value of the hopping bandwidth Wa?
Uplink
Terminal
EIRP = 20 dBW
Jammer
EIRP = 60 dBW
Figure 12.25 Satellite jamming scenario

Added by Denise W.

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