TABLE OF CONTENTS Binary frequency shift keying (FSK) shifts the carrier frequency to one of two discrete frequencies during the bit time T b for the representation of binary logic signals for the transmission of information. The modulated sinusoidal carrier signal has an amplitude of A V, a frequency of f c Hz, and a 0 reference phase angle, as given by the analytical expression in Equation 3.21.
| (3.21) |  |
The information signal or data source is m j( t) ( j = 0, 1) and for binary FSK m j( t) = 1 V for one bit time T b. The factor k f, with units that are Hz/V, is the frequency deviation factor (or the modulation gain) and the frequency deviation ? f is given by Equation 3.22.
| (3.22) |  |
Because m j( t) = 1 V the magnitude of the frequency deviation ? f is equal on either side of the carrier frequency f c .
On the CD A binary frequency shift keying (FSK) coherent digital communication system with AWGN is shown in Figure 3.8 (see Fig3-8.svu on the CD-ROM). To facilitate the simulation in SystemVue, all of the Analysis tokens, except that for the BER token output as the Final Value token, are deleted in the simulation model Fig3-8DT. As described in Chapter 1 the SystemVue Textbook Edition does not permit tokens to be deleted.
