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2. Phase modulation - Wikipedia

   en.wikipedia.org/wiki/Phase_modulation

   The peak amplitude and the frequency of the carrier signal are maintained constant, but as the amplitude of the message signal changes, the phase of the carrier changes correspondingly. Phase modulation is an integral part of many digital transmission coding schemes that underlie a wide range of technologies like Wi-Fi , GSM and satellite ...

3. Outline of radio - Wikipedia

   en.wikipedia.org/wiki/Outline_of_radio

   Information is carried by systematically changing some property of the radiated waves, such as amplitude, frequency, phase, or pulse width. When radio waves pass an electrical conductor, the oscillating fields induce an alternating current in the conductor.

4. Phase (waves) - Wikipedia

   en.wikipedia.org/wiki/Phase_(waves)

   The phase of a simple harmonic oscillation or sinusoidal signal is the value of in the following functions: = ⁡ (+) = ⁡ (+) = ⁡ (+) where , , and are constant parameters called the amplitude, frequency, and phase of the sinusoid.

5. Frequency modulation - Wikipedia

   en.wikipedia.org/wiki/Frequency_modulation

   Frequency modulation and phase modulation are the two complementary principal methods of angle modulation; phase modulation is often used as an intermediate step to achieve frequency modulation. These methods contrast with amplitude modulation, in which the amplitude of the carrier wave varies, while the frequency and phase remain constant.

6. Angle modulation - Wikipedia

   en.wikipedia.org/wiki/Angle_modulation

   Angle modulation is a class of carrier modulation that is used in telecommunications transmission systems. The class comprises frequency modulation (FM) and phase modulation (PM), and is based on altering the frequency or the phase, respectively, of a carrier signal to encode the message signal.

7. Amplitude modulation - Wikipedia

   en.wikipedia.org/wiki/Amplitude_modulation

   In the frequency domain, amplitude modulation produces a signal with power concentrated at the carrier frequency and two adjacent sidebands. Each sideband is equal in bandwidth to that of the modulating signal, and is a mirror image of the other. Standard AM is thus sometimes called "double-sideband amplitude modulation" (DSBAM).

8. Envelope (waves) - Wikipedia

   en.wikipedia.org/wiki/Envelope_(waves)

   A modulated wave resulting from adding two sine waves of identical amplitude and nearly identical wavelength and frequency. A common situation resulting in an envelope function in both space x and time t is the superposition of two waves of almost the same wavelength and frequency: [2]

9. In-phase and quadrature components - Wikipedia

   en.wikipedia.org/wiki/In-phase_and_quadrature...

   The two amplitude-modulated sinusoids are known as the in-phase (I) and quadrature (Q) components, which describes their relationships with the amplitude- and phase-modulated carrier. [ A ] [ 2 ] Or in other words, it is possible to create an arbitrarily phase-shifted sine wave, by mixing together two sine waves that are 90° out of phase in ...