Figure 3-13. Phase modulation. Modulating the phase of the signal changes the phase from what it would have been if no modulation were applied. In other words, the speed of rotation around the circle ...

To implement amplitude modulation (AM), we’d apply the modulating signal as a(t) and set Θ(t) to zero. Similarly, a phase-modulated (PM) signal would have a(t) set to a constant and the modulating ...

2. The QPSK signal can be expressed in several ways including phasors (a), a table (b), or a constellation diagram (c). This technique can also be used to produce even higher levels of modulation ...

New modulation schemes don’t come along very often. In fact, it has been years…decades really…. since any new modulation method has been invented. Remember there are only three basic ways a ...