Power Spectrum or BPSK Modulated Signal
Continuing with our simplifying assumption of zero initial phase of the carrier and with no pulse shaping filtering, we can express a BPSK modulated signal as:
Now, the power spectrum S(f) of the modulated signal can be expressed in terms of UB(f) as:
Fig.5.24.4 shows the normalized base band power spectrum of BPSK modulated signal. The spectrum remains the same for arbitrary non-zero initial phase of carrier oscillator.