Modulation scheme: Difference between revisions
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! style="background:#efefef;" | [[Wikipedia:Phase_modulation||PM]] |
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! [[Phase Modulation]] |
! [[Wikipedia:Phase_modulation|Phase Modulation]] |
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Revision as of 13:51, 27 September 2004
The Modulator converts an input signal into a form suitable for RF transmission. The Demodulator recovers the original signal. Since the RF signal is a based sine wave oscillating around the transmission frequency, the Modulator has to modulate this sine wave in a way so that all information is transmitted and well-recoverable but only as little Bandwidth as allowed is allocated.
The more the Modulation Scheme modifies the original sine wave the more the Frequency of the RF sine wave will vary -- the higher the Bandwidth will be.
| Shortform | Name | |
|---|---|---|
| AM | Amplitude Modulation | |
| FM | Frequency Modulation | |
| [[Wikipedia:Phase_modulation | PM]] | Phase Modulation |
| Shortform | Name |
|---|---|
| BPSK | Binary Phase Shift Keying |
| QPSK | Quadrature Phase Shift Keying |
| QAM-16 | 16-state Quadrature Amplitude Modulation |
| QAM-32 | 32-state Quadrature Amplitude Modulation |
| QAM-64 | 64-state Quadrature Amplitude Modulation |
| QAM-128 | 128-state Quadrature Amplitude Modulation |
| QAM-256 | 256-state Quadrature Amplitude Modulation |
| 8VSB | 8-state Vestigial Side Band Modulation |