ST2115
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23
(c) Product signal
Generation of a DS spread-spectrum signal
Figure 7
Where {
c
n
} represents the binary PN code sequence of ±1's and
p
(
t
) is a rectangular
pulse of duration
T
c
as illustrated in figure 8. This multiplication operation serves to
spread the bandwidth of the information-bearing signal (whose bandwidth is
R
Hz,
approximately) into the wider bandwidth occupied by PN generator signal
c
(
t
) (whose
bandwidth is 1/
T
c
, approximately). The spectrum spreading is illustrated in figure 8,
which shows, in simple terms, using rectangular spectra, the convolution of the two
spectra, the narrow spectrum corresponding to the information-bearing signal and the
wide spectrum corresponding to the signal from the PN generator.
(a)
(b)
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Содержание ST2115
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