MSK (Minimum Shift Keying) CML Microcircuits, MSK (Minimum Shift Keying) Datasheet - Page 7

• 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
signal-to-noise ratio (SNR) versus BER. SNR is considered by some as an inaccurate method for comparison of
performance because of its dependence on noise BW. In other words, the SNR can be significantly altered by varying the
system BW. Unless all systems have identical BW it is difficult to make comparisons. A more accepted measure of
performance is E
Where, S = signal power
Figure 5 is a plot of typical performance characteristics for ideal coherent and non-coherent MSK detectors.
2. Implementation
demodulator including carrier detection and data synchronization.
2.1 MSK modulator
Hz frequencies. The frequencies for different data rates and bit polarity (logic one or zero) are given in Table 2.
© 1997 MX COM Inc.
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
In this section we describe the implementation of a 1200/2400 bit/second MSK modem. That is, a MSK modulator and
Depending on selected bit rate and digital data input, the modulator generates one of the 1200 Hz, 1800 Hz, or 2400
R = data rate in bits per second
N
E
B
B
b
n
n
0
N
= energy per bit
= noise BW of IF filter.
= noise power spectral density (watts/Hz)
0
= N = noise power
b
/N
0
versus BER. E
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Figure 5: BER versus SNR where noise BW equals the bit rate.
b
/N
0
is related to SNR as shown below,
N
E
b
0
Ideal Coherent
Characteristic
RN
S
0
N
S
7
B
R
n
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.
Non-Coherent
Characteristic
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Doc. # 20830084.001
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APPLICATION