Modulation scheme
Description
A sphere packing mapped into a time-dependent electromagnetic signal [1][2]. There is a close relation between abstract real-space encodings and modulation schemes, and certain simple sphere packings are often synonymous with their corresponding modulation schemes.
Linear modulation schemes encode points into amplitudes of electromagnetic waveforms. Pulse-amplitude modulation (PAM) associates each point with a real-valued amplitude of one quadrature of an electromagnetic waveform [2; Sec. 10.5]. Quadrature amplitude modulation (QAM) associates each pair of points with a complex-valued two-quadrature amplitude of band-limited signal [2; Ch. 16].
Parent
Children
- Frequency-shift keying (FSK) code
- Pulse-position modulation (PPM) code
- Quadrature-amplitude modulation (QAM) code
- Phase-shift keying (PSK) code — PSK is a modulation whose constellation consists of points arranged equidistantly on a circle.
References
Page edit log
- Victor V. Albert (2023-03-05) — most recent
Cite as:
“Modulation scheme”, The Error Correction Zoo (V. V. Albert & P. Faist, eds.), 2023. https://errorcorrectionzoo.org/c/modulation