MSK (Minimum Shift Keying) CML Microcircuits, MSK (Minimum Shift Keying) Datasheet - Page 5

• Manufacturer Part Number: MSK (Minimum Shift Keying)
• Description: Minimum Shift Keying and its Application to Wireless Data Transmission
• Manufacturer: CML Microcircuits

MSK and its Application to Wireless Data Transmission
Subtracting (17) from (16) yields,
Equation (18) states, for h = 0.5 , the frequency separation between f
a set of four waveforms for a typical MSK modulator.
Figure 3: Typical MSK modulator outputs for (a) logic 0 and
logic 1 and
other words, zero crossing detector must discriminate down to the occurrence of a single zero crossing in order to
accurately demodulate the data signal. According to [7], a non-coherent zero crossing detection scheme will perform
nearly as well as a coherent detector if the FSK signals are orthogonal. For two signals to be orthogonal over an interval
T , their inner product must be zero,
where, y(t)
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In Figure 3 it should be noted that e(t) for a logic 1 ( S
x(t) and y
n
= .
*
(t) is the complex conjugate of y(t) . If x(t) and y(t) are real then (19) becomes
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S
S
n
n
=+1
=-1
e(t)
e(t)
(a)
(c)
n
T
T
T
0
0
f
=0
2
x t y t dt
x t y t dt
( ) ( )
( ) ( )
f
1
*
n
5
= +1 ) has only one more zero crossing than a logic 0 ( S
2
1
T
t
t
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0
n
0
.
=0, (b) logic 0 and
e(t)
e(t)
1
and f
2
is equal to half the bit rate. Figure 3illustrates
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(b)
(d)
n
=
n
= , (c) logic 1 and
t
t
Doc. # 20830084.001
(18)
(19)
(20)
n
APPLICATION
=0, and (b)
n
= -1 ). In