I did some simulations where I created a BPSK signal, and then found the spectrum of the signal. The spectrum had a peak at the carrier frequency. It also had peaks at regular intervals frequencies higher than the carrier frequency. There were no peaks at frequencies lower than the carrier frequency. People around me, people who have PhDs in the field of digital communications give me conflicting information. They tell me that there are spectral peaks on both sides of the carrier frequency. In other words, they say that the spectrum is symmetrical about the carrier frequency. This outright contradicts my simulation, and I don't think that it can be proven any other way than by doing a simulation, and I'm generally better and simulation and spectral analysis than they are. Can anyone confirm or deny that the spectrum of a BPSK wave is indeed asymmetrical about the carrier frequency?