MSK (Minimum Shift Keying) CML Microcircuits, MSK (Minimum Shift Keying) Datasheet - Page 6

• 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
For any FSK system where
Performing the integration in (21) yields
For MSK equation (18) can be rewritten in terms of radian frequency
And the radian carrier frequency is
Substituting (23) and (24) into (22) yields
Which has the solution
Where k is an integer.
separation between f
Doelz and Heald [3] which resulted in a US Patent, assigned to the Collins Radio Company. Figure 4 is a simplified block
diagram for a MSK modulation system.
efficiency is somewhat application dependent—in general cost, size, and power consumption must be minimized while
performance must be maximized. The performance of a MSK demodulator can be quantified by measurement of the
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As a result, if equation (26) is satisfied, f
A modulation scheme is of little practical value if it can not be demodulated in an efficient manner. The definition of
1
and f
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2
. Hence, the name Minimum Shift Keying. This modulation scheme was first proposed by
1
=2 f
SOURCE
DATA
NRZ
1
and
sin(
2
=2 f
2
1
(
and f
2
1
Figure 4: MSK modulator.
1
, equation (20) can be written as
sin(
T
0
2
cos(
1
C
C
will be orthogonal. In fact, equation (23) represents the “minimum”
MODULATION
INDEX = 0.5
2
2
2
)
)
T
2
k
C
2
T
6
1
1
T
t
) cos(
2
.
)
sin(
T
2
(
.
2
0
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.
.
1
1
2
t dt
)
2
2
)
)
T
0
.
VCO
0
Fax: [phone]
.
Doc. # 20830084.001
(21)
(22)
(23)
(24)
(25)
(26)
APPLICATION