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In a coherent FSK signalling scheme the signals and
are defined to be
These signals are used to transmit equally-likely bits over a
channel which adds white Gaussian noise of spectral height
to the signal.
- Assuming
, show that the ``correlation
coefficient'' of the signals and , defined as
is given approximately by
where is the duration of a bit interval.
- What is the minimum value of the frequency shift
for which the signals are orthogonal?
- Draw a block diagram of the receiver which attains the minimum
probability of error.
- Compute the minimum probability of error as a function of
.
- What is the value of that minimizes the probability
of error?
Hint: You may need these equations:
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Dr. Bernd-Peter Paris
2003-01-28