Frequency-Hopping Spread Spectrum Theory
Consider a signal d(t) such that a 0 bit in d(t) is represented by some frequency f1 while a 1 bit in d(t) is represented by another distinct frequency f2. Now s(t) can be considered as a Binary Frequency Shift Keyed (BFSK) signal; and this kind of modulation, whereby a baseband digital signal is transmitted by taking the logic levels (0 and 1) on two different frequencies and is then keyed accordingly, is called Binary Frequency Shift Keying.
The BFSK signal s(t) is as follows
where k and theta are two phase constants. The frequency modulation is then applied by varying the carrier frequency so that the ...
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