Another issue in frequency modulation is that the different carriers shown in Figure 5.22 have different phases, φi = φj for i = j, so at each symbol time Ts there will be a phase discontinuity in the transmitted signal. Such discontinuities can significantly increase signal bandwidth. Thus, in practice an alternate modulator is used that generates a frequency-modulated signal with continuous phase, as will be discussed in Section 5.4.2.
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