Brief Description of Vector Signal Analysis
R&S
®
FSV-K70
61
Operating Manual 1176.7578.02 ─ 09
t
j
du
u
f
j
REF
t
REF
e
e
t
REF
2
where
φ
REF
(t)
denotes the phase of the transmitted waveform. In the R&S
FSVA/FSV-
K70 a continuous phase FSK signal is assumed, which is ensured by the integral in the
expression for
REF(t)
. A graphical depiction of the reference waveform generation is
shown below in Figure
.
Figure 2-56: Reference complex baseband FSK signal generation
Reference Deviation
The transmitted symbols {s
i
} are assumed to be chosen from a finite and real-valued
constellation of
M
values;
{
ς
1
,
ς
2
,...,
ς
M
}
. The maximum absolute constellation point is
denoted by
ς
MAX
. The maximum phase contribution of a data symbol is given by:
dt
t
g
h
MAX
MAX
2
The reference deviation of the FSK signal is defined as:
dt
t
g
h
T
T
MAX
MAX
REF
1
2
In the R&S
FSV-K70 the frequency pulse filter is normalized such that
2
1
dt
t
g
and the constellation for
M
FSK is assumed to be
{
±
1,
±
3, ...,
±
(M-1)}
, which implies .
The expression for the
in terms of the modulation index is therefore
given by:
Symb
REF
f
M
h
1
2
1
The above formula provides the necessary calculation for measurement of an FSK sig-
nal with known symbol rate and modulation index.
Calculation examples:
Signal Model, Estimation and Modulation Errors
Содержание FSV-K70
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